Undo one screw, remove the cover from the electrical terminal box and disconnect the pump head from the electrical cable. Check flow is at least 3 litres/min – rectify as necessary. Open the pump isolating valve and the primary return valve, then refill the central heating system as described in section 5.2, checking for leaks. If your boiler is a more modern, combination model, attempt a full reset. Set the pump  speed selector switch to maximum. OVERHEAT RESET BOILER OFF ON HEATING TEMPERATURE ON BOILER OFF Lock-out button Front panel removed (pull forward at top, then lift off) Front panel fixing clips Front panel bottom locating tags GRA NT Mains On neon. In instances where oil contacted skin wash it with soap, use a lot of rinsing water (until oil is fully removed from skin ) and a lanolin-based barrier cream afterwards, avoid any cloth contact with mineral oil, especially those which are touching your skin directly, avoid puting oily rags or tools in pockets, especially trouser pockets, always have a first-aid treatment near the place you work, avoid inhaling any vapours from mineral oils, never hang or put anything next to or on a boiler itself, all repairs, service and maintenance work (under or over guarantee) must be carried out only by an authorized boiler technician using Grant original spare parts, boiler should be immediately switched off you you suspect that it is not working properly. The control panel is fitted with an ON/OFF switch, boiler thermostat control knob and the manual reset button for the overheat thermostat. It is not a Combi boiler and happens at anytime of the day/night. 5. Remove the spring circlip holding the microswitch (4) assembly to the diverter valve (1), and separate the microswitch assembly from the valve. 8. Unscrew the plastic cap and press the reset button (see right). The boiler will not light until the overheat thermostat is reset. In the event that you know the Manufacturers part number please utilize the extensive search facility to locate your Grant Heating Spare Part, should you require any further assistance please e-mail us with the … in the situations where fixed head type shower is used, no anti-syphonage devices are required. Re-assemble in reverse order  and refill the central heating system. Unscrew both compression nuts on the check valve and remove it from the boiler. }These will not be lit until activated 6. Unscrew the valve union and remove the valve from the boiler. Was working today but stopped. My Boiler Will Not Apply Central Heating You may or may not drain down the heating system. You can also use “constant” option and then boiler will provide central heating continuously, over-ruling all of the other settings. Check for 230 V output from BURNER LIVE terminal of PCB. Indicating low system pressure, have bled rads and water … We moved a few months ago, and have found that the boiler stops working intermittently. A leak that has developed around your system’s pipes could be caused by corrosion. A water hardness test kit is supplied with the boiler. check controls are switched on and calling for heat, Check boiler On/Off switch is set to ‘ON’, Set 3-position           Heating switch to ‘Constant’. Place an absorbent cloth below the pump before removing the head to catch the water, and avoid placing any strain on the electrical cable. Before start to work on any Grant boiler set the boiler into OFF position (move to gauge to off), close valve that supplies fuel and isolate the supply of electricity. The boiler is capable of a maximum flow temperature of 75° C. 1 - INTRODUCTION 1.1 How a condensing boiler works 1.2 Heating system design considerations To achieve the maximum … 7. In those instances a red neon will illuminate indicating that the thermostat has operated. Always call a Gas Safe registered engineer and get it checked out, just in case. 2. After locating it, thaw the blocked or frozen pipe by simply putting the hot water. Grant Vortex Pro Kitchen/Utility Oil Boilers 5 For short periods - Set the On/Off to OFF. In this case the room thermostat (if your appliance was supplied with it) will ask for heat. The boiler is fitted with an overheat thermostat (which allows it to be used on a sealed central heating system) which will automatically switch off the boiler if the heat exchanger exceeds a pre-set temperature of 111°C ± 3°C. Some common boiler issues don’t even need an engineer but if in any doubt whatsoever, it’s always best to contact an engineer. Take a look at the table below to see how much you could be saving depending on your current boiler rating and property. To reset, … However, if you are having to reset your boiler two or three times, there will be a good reason for doing so. If this does not help, it points to a faulty mechanism within the boiler – most probably the motorised diverter valve. Check flue draught and improve flue as necessary. When refilling the system following precautions need to be taken care of: – add water to the system only when the boiler is off and the system it is cold, pay attention no to overfill, – make sure a flexible filling loop is properly connected, ensure that open position of flexible filling loop to the boiler. Periodically check that they are clear. Page 5: Notes About your fuel must not be obstructed. Was working. 2. Fit a replacement air vent using reverse of above procedure, 8. Overheat thermostat: Automatically cuts the burner out if the boiler overheats. 8. Whenever there is a burner malfunction built in your appliance, a safety circuit switches will set burner to off and the “lock-out reset” button will light. For summer time operation, when central heating is not required, set the heating switch to”how water only” position or “off” in case of Vortex Combi. *According to the latest figures from the Energy Saving Trust. 6. Draining should be performed by qualified boiler specialist. To check the boiler pressure, simply take a look at the built-in pressure gauge, if you see anything below 1 then you may have an issue. To replace pump head only – Using an Allen key, remove both screws securing pump head (motor) to the pump body. 26 Nov 2008 #13 DGOBS said: Ok, as its a grant boiler, I will assume it's either a RDB riello or a g3-g5 riello When you depress the reset button, the burner will run (on pre-purge) for 12 … Terms & conditions Check and set switch to ‘Constant’ to test. Any ideas what the … 3. 4. The temperature of the water leaving the boiler to the radiators can be increased by turning the boiler (heating) thermostat clockwise. Don’t try to build-in your boiler into the compartment/cupboard unless you contacted the installer and got permission to do it. ), Limescale or sludge building up on the heat exchanger, Sludge or air building up in the system or an unequal distribution of heat, Your radiators will need to be bled which doesn’t require an engineer but if you don’t feel like carrying out the task yourself, Could be low water pressure, a problem with the thermostat or a lack of water flow due to a closed valve, air or the pump not circulating the water in the system properly. Vinegar can be used to remove calcium, but take care not to scratch metallic surfaces. using a suitable pressure gauge. Connect vacuum gauge to pump and check pump vacuum. The boiler will not light until the thermostat is reset. It’s easy enough to reset: there is a little button under the boiler that pops out, and can be pressed back in to fire it back to life… but needless to say if the problem occurs when we are out, we could come home to a very cold house. Pay special attention to the flue terminal not getting blocked by large piles of snow during the wintertime. With the Heating switch set to “timed”, your boiler will make central heating able to work at each instance when the timer is set for an ‘on’ period. Reconnect the flexible hose, ensuring that the sealing washer is correctly fitted in the union before tightening. 13. One of the most efficient ways of re-pressuring the system in simply adding water to it. To find trusted engineers near you, use our service to receive free quotes for a new boiler installation. The cold water isolating valve in the boiler is closed. – close the valves either side of the filling loop and disconnect the loop. Check if your appliance is equipped with frost protection (optional), whenever it is not the case it is recommended to leave the boiler on with the boiler thermostat set at a low setting, instead of switching off the boiler. The maximum temperature of the central heating water is 85°C for the Combi V3 and Combi Max and 80°C for the Vortex Combi models. Before you start to work on Grant boilers set the boiler into OFF position (move to gauge to off), close valve that supplies fuel and isolate the supply of electricity. Dismantling of the main body of the valve for inspection and/or cleaning should be carried out in following order: remove the control knob fixing screw; pull off the control knob and carefully lever off the plastic housing under the knob, note correct positions; unscrew the brass top assembly from valve body; remove the lower assembly and spring; carefully remove any scale deposits or other particles from the valve seat and other components. We recommend to set the temperature to maximum in order to assure optimal hot water supply. VAT Inc. VAT. Plate heat exchanger and diverter valve replacement. Slacken the four control panel fixing screws, carefully disengage the control panel from both casing side panels and the front top panel and allow it to rest at an angle on its right hand end, 5. Plumber. Wait till the boiler to cools down before the button will reset. Attention! Drain the central heating system and boiler using the drain cock on the boiler. 09/03/2015. This website uses cookies to provide you with a better experience. When this happens a ‘lock-out reset’ button will light up, pressing this will bring back normal operation. Thermostatic mixing valve incorrectly set, Check continuity and replace if necessary, Set pump speed switch to maximum (top position), Check operation of burner on central heating, Check electrical continuity   of burner microswitch, Check electrical continuity of thermostat, Check wiring continuity from burner to microswitch, Burner oil pressure set too low at oil pump, Check and set oil pressure to correct value, Timeswitch either not set, or not in an ‘ON’ period, Check setting and set to ‘Constant’ to test, Check continuity of switch, replace if necessary, Timeswitch OK but not switching boiler on. To reset, unscrew the small plastic cap (see Fig. The replacement of your boiler will have to be carried out by a qualified engineer, they’ll either from a national company or an independent local. Your boiler should be serviced annually in order to make sure it is safe and operates efficiently. When adjusting schedule for the ‘on’ periods it is useful to remember that it might take up to an hour for the house to become warm, especially during the winter. 5. Unscrew the two other unions 11 and 12 on the mixing valve, and remove valve from the boiler as shown on the picture. • Overheat Thermostat (Overheat Reset) The boiler is fitted with a safety overheat thermostat which will automatically switch off the boiler in the case of a control malfunction causing overheating. 7. Page 85: Boiler Overheat Thermostat 12.4 Boiler Overheat Thermostat Primary fault Secondary follow on checks BLANK DISPLAY SCREEN BOILER OVERHEAT STAT TRIPPED Is the central Is the heating Is overheat stat Press reset. According to the law oil boilers are falling under ‘controlled service’ appliance. Note: The time on the internal 7-day or 24-hour timer may need to be reset after a power failure. That way you know that you’re getting the best deal for you. Calculations are based on a mid-range gas boiler and average installation costs – depending on your requirement. Use the table below to identify possible faults with your boiler. Check pump is free to rotate and is vented. 3. 11. The hot water (store) pump won’t operate either. It’s primarly funtion is to lead the central heating system. Can be manually reset once the boiler : has cooled down. Privacy, The smarter way to find approved boiler engineers, Always use a Gas Safe registered engineer. Brian. Some Grant boiler models come equipped with a frost thermostat. BURNER Power to the burner for it to operate. Thermostatic mixing valve incorrectly fitted. Re-assemble in reverse order  and refill the central heating system, 4. Take a note of what fuel is suppose to be used (label on the inside of case side panel). There could also be an … Boiler Parts.co.uk only supply Genuine Grant boiler spares for online purchasing, for delivery direct to your door, this section covers the spare parts for the Grant Euroflame System 90/120 model. 6. Boilers are normally extremely reliable and provide our homes with heating and hot water whenever we call upon them. If the leak stems from your pressure relief valve, it is likely that your system’s pressure has become too high. The flue terminal that is located on the outside wall can’t be damaged or obstructed. The Grant Vortex boiler will however still operate at extremely high efficiencies even when it is not in condensing mode and therefore is suitable for fitting to an existing heating system without alteration to the radiator sizes. Whenever in doubt replace the pipes, avoiding any skin contact with mineral oil or/and with clothes contaminated with fuel. Refer to the procedure given on the front of the vessel. Limit Indicator - RED. If the problem persists then an engineer will be needed to investigate. Taking out insurance can be done with your energy supplier but there’s absolutely no obligation to do so. The boiler won’t light until the thermostat is reset. ‘Lockout’ Indicator- RED. And now to the point of my post. Hot tap is not connected to hot water outlet of boiler, Insufficient flow of water through boiler. The boiler will not light until the thermostat is reset. Registered in England & Wales number 6873930. © 2020 Boiler Guide A), press the button then replace the cap. 9. Replacing your boiler could lead to savings of as much as £305* a year if you live in a detached home. How to : operate your Grant boiler: Pressure gauge (sealed system boilers only) Ensure that the pointer on the gauge is … You will recognize it by seeing amber light illuminating. Contact your installed to agree on a service date. Where possible the pipework should be insulated to reduce heat loss. Attention!This appliance must be earthed. Most Grant boilers come with a 3 year warranty, but they can extend to as long as 5 to 10 years when they’re installed by a G-One accredited installer. When required, a shower may be fitted in the domestic hot water system. Check flue terminal is clear (balanced flue). Check room ventilation          is adequate     (conventional flue). 5. Gain General Access -unhook the expansion vessel from the front of the boiler and lay to one side. Reset burner air        damper and check combustion. 9. Other solvents shouldn’t be used; re-assemble the valve using reverse of the above procedure, ensuring that the large diameter of the spring is at the bottom of the valve. • System Pressure Gauge (Internal System models only) This is to indicate the … Don’t try to repair the fault yourself, instead contact an OFTEC registered engineer as soon as possible. GRANT SPARES CATALOGUE (NI) Multipass Utility/Boiler House/External. In those instances reset button will bring back normal operation. Fit the bracket onto the replacement vessel and tighten both screws evenly. The boiler won’t light until the thermostat is reset. Find out more with our guide to low boiler pressure. Carefully move the pipe forwards and then down by about 100 mm to leave access to the two compression connections on the check valve. The boiler won’t operate, where there is no electric supply. Check flue condition/size and alter as necessary. Should you try to light your boiler but it doesn’t work and the ‘lock-out’ reset button isn’t lit, that suggests that the overheat thermostat has operated. Unscrew and disconnect pipe union 3 from the rear of the diverter valve. To reset, unscrew the small plastic cap press the button then replace the cap. 1:5 OPERATING INSTRUCTIONS 1:5.1 BOILER CONTROL THERMOSTAT The Boiler Control Thermostat is also the ON/OFF switch for the … Slacken the two cross head screws and remove the mounting bracket from the expansion vessel. Gas Safe Register is a registered trade mark of HSE and is used under license. The Grant Combi 90 MkII limit thermostat or also know as the overheat thermostat is To stop the boiler from firing too often, aqua stats have a high limit temperature and a low limit. If your current Grant boiler was installed many years ago, then it might be time to consider replacing it. That can be done by opening a sludge valve which is located at the end of the tank, clean or replace filter element while keeping fuel supply valve closed, clean filter bowl if necessary, check min annually flexible fuel supply pipes, it is mandatory to replace those every two years. Check flue is clean and unobstructed – rectify as necessary. Has anyone … Close the fill point valve. Boiler needs to have a proper ventilation. Hi, I have a grant vortex oil boiler that keeps tripping the overheat stat. 9. To reset the overheat thermostat, unscrew the small plastic cap marked “overheat reset” (see Figure 1-1), press the button and If this condition continually repeats, contact your service enigneer. Hello, we have a Grant Vortex 26 oil fired, 2007. When the store switch is set to OFF position, the burner will not fire in order to maintain the water temperature. The internal timer (if fitted) will operate with the on/off switch set to OFF whenever electric supply is provided to the boiler, but the boiler won’t operate to provide hot water. 7. To reset, unscrew the small plastic cap press the button then replace the cap. For long periods: Set the On/Off switch to OFF and switch … Certain repairs needs to be obtains due to wrong fuel used. In practice it means that your boiler needs to be installed and commissioned by a person having proper qualifications (Oftec registered technician), Before using the boiler, after each restart and repair following steps should be considered. 4. If required, the fuel supply valve may be closed and the water and electricity supplies turned off at the mains. No special material needed. All Grant oil fired boilers are designed to heat up water directly from the main water supply at your home. I have a grant euroflame 50/70 (oil feuled boiler) and when the boiler reaches temperature it shuts off fine but as it cools down the pump starts up again but the boiler won't fire up and it goes into lockout. Ensure the sealing washer inside the union is kept for re-assembly. You need to pay special attention to: How to adjust temperature of the water for heating or/and hot water? When it comes to getting quotes we don’t recommend going with the first one you receive, instead aim to get as many as 3. We match 7. I've recently moved in to a property and have an issue with an external Grant Pro boiler. To maintain a longer and more consistent hot water temperaturethe factories fitted a flow restrictor  to all Grant models (Vortex Combi 36 and  Combi Max are the only exceptions) The purpose of flow resistor is to  reduce the flow rate to 15 litres/min. Take into consideration that you will need to reset the switch in order to return to your pre-set periods. … read more. Unscrew the capillary tube nut and disconnect it from the valve. your requirements with pre-screened companies to ensure you’re only contacted by trusted & Your boiler is equipped with a safety overheat thermostat. Warning! Fit a replacement pump using the reverse of the above procedure, ensuring the sealing washers are correctly fitted in the pump unions, and that pump flow direction (as indicated by arrow on pump body) is correct. Try Boiler Guide today! E&OE. Firstly, you have to locate a blockage in the condensate pipe. OP, what type of boiler do you have? Unscrew the flexible hose union nut on the expansion vessel and disconnect the hose. Can someone point me in the right direction please. We advice to you check through the following guide tables when identifying problems and for the purpose of correct communication with customer service representative or requesting a service engineers visit. Grant Vortex Eco Utility Oil Boilers 5 For short periods - Set the On/Off to OFF. Step 5: Check the fault code. Check electrical    continuity of pump microswitch. Unscrew the union and remove the plate heat exchanger with diverter valve attached. Find the best boiler for your needs, or see how the latest A-rated boilers compare with each other and your existing one. Allow the pipe to rest on top of the plate heat exchanger. 12. You may or may not drain down the heating system. Check for 230 V at boiler terminal block. 10. Boiler Guide is operated by Boiler Guide Limited. Also warmth produced by the central heating will remain for a time when the central heating is turned off. Check that an extract fan is not pulling combustion gases from burner, Check all joints and flexible hose for leaks, Check gasket, re-tighten nuts or replace gas, Burner not correctly fitted on mounting flange, Remove and re-fit burner ensuring correct fitting, Check and replace ‘O’     ring as necessary, Thermostat sensor not connected to PCB (Vortex Combi only), Mains water supply is not connected to cold water inlet of boiler, One or more isolating valves, stop cocks, etc. Unscrew the discharge pipe compression nut an disconnect it from the valve. to boiler) must be checked annually to ensure that there is a 1.0 bar air charge in the vessel. Contaminated combustion air (balanced flue). Unscrew and disconnect pipe unions 1,2 3,4,5 & 9 as shown on the picture below. Ensure that the mixing valve is correctly connected, i.e. 6. Check continuity of overheat thermostat – replace as necessary. Burner not firing for hot water (after a short time). If this condition repeats often, inform your installer  in order to investigate the possible fault. The overheat thermostat will automatically switch off the boiler in the case of a control malfunction causing overheating. Grant Vortex External modules … A boiler leak is usually caused by an issue with an internal component, such as a pressure valve or pump seal. Unscrew and disconnect pipe unions 1, 5 & 9 as shown on the picture. Drain the central heating system and boiler using the drain cock on the boiler. Check hot and cold       inlets are connected correctly. The control panel is fitted with an ON/OFF … BURNER Power to the burner for it to operate. Should you be in any doubt at all about what’s wrong with your boiler, use our free service to get quotes from reliable engineers near you. Replace the mixing valve and re-assemble in reverse order. 5. Only show branches with stock available now. Ideal Logic Combi - User’s 3 Legend a. Pre-heat On/Off B. DHW Temperature Control C. CH Temperature Control D. Mode Control E. Boiler Status F. Burner ‘on’ Indicator G. Pressure Gauge h. Condensate Drain J. 8. Undo one screw, remove the cover from the electrical terminal box and disconnect the pump from the electrical cable. Should the leak be due to a problem with the pump seal, the seal could have worn out. SWITCH RESET REFER TO WIRING DIAGRAM IN MANUAL Test Boiler Boiler Overheat thermostat switch On/Off switch thermostat reset button (under screw cover) Boiler front ‘Lock-out’ reset button panel removed Controls for External modules - Fig. Press reset button –        no more than twice. Not all Grant oil fired boilers are suitable for use with a sealed system, check if that is the option on your user manual. In instances when your boiler goes off and you try to light it but it doesn’t work and the ‘Lock-out’ reset button on the burner is not lit, most probably the overheat thermostat has operated. 9. Your boiler will relight automatically when electric supply is restored. Messages 1,749. In instances when pressure exceeds 8 bar reducing pressure valve usage is recommended.The boiler may still operate down to a pressure of 1.0 bar but with a reduced flow rate. The only way I can get it going again is to take the photocell, reset the over heat button put the photocell back in and then it will start, but the same thing happens after it reaches temperature. I suspect that the frost stat is causing the boiler to start up but for some reason the pump is not starting up to circulate water. Insufficient combustion air supply to burner. Remove the vertical 15 mm pipe from the boiler to gain access to pipe union 6. Lastly, restart or reset your boiler by pressing a button. Normally those malfunctions are short lived. Should you try to light your boiler but it doesn’t work and the ‘lock-out’ reset button isn’t lit, that suggests that the overheat thermostat has operated. How to re-pressurise the system by adding water? Working from the front of the boiler, disconnect the cold water inlet pipe at both the elbow connector in the top of the boiler, and at connection 5 on cold water inlet isolating valve (A) as shown on the picture below. Flue pipe or liner is too large or existing stack is unlined. in the pipework are closed. Grant Vortex, Grant Spira. Check switch continuity, replace if faulty, Diverter valve microswitches not operated. It is recommended that thermostatically controlled shower valves are used to protect against a flow of water at too high a temperature. Wait till the boiler cools down. Open all valves in pipework to and from boiler. If your home is installed with a Grant boiler, we’ll be taking you through some of the most common problems you might come across and how to get the boiler going again. The minimum flow rate needed for the flow switch to operate is 3 litres/min. During very cold conditions the overheat stat is tripping which requires me to manully reset. You can find flow restrictor inside of the cold water inlet of the isolator valve (placed on the outside of it). I have a Grant Combi 26e boiler. BOILER REsET PROCEDURE - To reset boiler, turn mode control knob to reset position and immediately turn knob back to required setting. OVERHEAT Boiler overheat thermostat has operated and switched the boiler off. Broken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels, Most likely to be a broken internal component but it will depend where the water is leaking from, Air in the system could be causing this, otherwise it could be that the water pressure is too low, Could be a water leak in the system, the pressure relief valve needs replacing or due to recently bleeding radiators, This fault should be displayed on your boiler as an error code or warning notification, Thermostat could be turned off or not set to the correct settings (time etc. Mains Indicator- ORANGE }These will not be lit until activated 5. Up to 97% … Check for blockage in filter, fire valve, valves or pipe and rectify. To ensure economic use, the pipe runs between the boiler and hot taps should be as short as possible and in 15 mm copper pipe or 22 mm for the Combi Max and Vortex Combi 36 only. Safety switches will switch the burner off whenever there’s a burner malfunction in your appliance. Normally boiler heating thermostat operation doesn’t affect the temperature of the hot water flowing to the taps. Unscrew and remove the single burner fixing nut (located above the burner, in the middle of the mounting flange) and withdraw the burner from the boiler and lay it to one side. Even the smallest of leaks can be a serious boiler issue. Open valve (situated above pump in front of boiler). 4. To access the controls, open the lower … If your boiler continues to lock out, you will usually see a fault code appearing in the display. To replace complete pump – Undo both upper and lower pump unions, noting the correct direction of flow (downwards). • Overheat Thermostat (Overheat Reset) The boiler is fitted with a safety overheat thermostat which will automatically switch off the boiler in the case of a control malfunction causing overheating. When this happens, a red neon light will illuminate. 3. The smarter way to find approved boiler engineers in your area. If you’re not sure what it means, take a look through our comprehensive list of Grant error codes. Check continuity of wiring to timeswitch. If a conventional flue is fitted to the boiler, unhook the flexible air inlet tube from the hook bracket on the crossmember, and remove the hook bracket from the boiler crossmember. Shut off valve and verify if at the front is closed, –  make sure that valve is open when the operating lever is in line with the valve, ensure that valve closed when it is at right angles, – slowly open the double check valve on the front of the filling loop until water is heard to flow, – vent each radiator in turn, starting with the lowest one in the system, to remove air, – continue to fill the system until the pressure gauge indicates the required pressure between 0.5 and 1.0 bar. If not possible, an anti-syphonage device should be fitted at the point of the flexible hose connection. 6. 8. The boiler will not light until the thermostat is reset. Grant Spares Catalogue NI Mar 2015:Layout 1. T. tosullivan Frequent Poster. To restart, simply set the switch to ON. I have a Grant Combi mkII which has been giving me an over heating problem after using hot water recently , prime example is i have a shower in the morning before work hot water is fine , by the time i've dressed and come down stairs the boiler has gone in to 'Overheat' , eventually once the boiler has cooled i can use the reset and the boiler will work fine , … Warning! 4.Boiler heating thermostat  normally controls the temperature of the water. To do this, wait until the boiler has cooled down and then unscrew the small plastic cap, press the button then replace the cap. 3 Safety thermostat - Your boiler is fitted with a safety overheat thermostat which will automatically switch off the boiler in the case of a control malfunction causing overheating. T be damaged or obstructed and set switch to operate a control malfunction causing.. Mounting bracket from the main water supply at your home before and after any work possible cause a suitable gauge! Incoming mains should be fitted in the union before tightening the charge pressure in the case of a control causes... Other settings, noting the correct direction of flow ( downwards ) most probably the diverter., unscrew the union before tightening take care not to scratch metallic surfaces upper lower! Is restored outside of it ) will ask for heat should the stems! Adjust temperature of the plate heat exchanger to de-pressurise the boiler warranty come! By a 5 Amp fuse the discharge pipe compression nut an disconnect it from the electrical cable for blockage the... Should periodically verify it and clean as needed the latest A-rated boilers compare each. An engineer will be needed to investigate the possible cause the fault,... And after any work boiler warranty has come to an end, then it might be time consider. The smarter way to find trusted engineers near you, use our service to it... The valves either side of the boiler overheats Max and 80°C for the overheat thermostat: cuts! Kept for re-assembly be a serious boiler issue know that you will need be recharged values! Forwards and then down by about 100 mm to leave access to pipe union from... Heating ) thermostat clockwise fitted with an external Grant Pro boiler the hot... ‘ off ’ periods, set the switch to off and switch … overheat overheat! So please be gentle! a flow of water within the boiler in the situations fixed! Wo n't switch off even when no hot water ( store ) pump won ’ t damaged... Boiler using the drain cock on the outside of it ) and …... And boil the main water supply do it button then replace the cap not lit... Anytime of the most efficient ways of re-pressuring the system will need to,... That the sealing washer is correctly fitted in the right direction please and from boiler engineer and it. Over-Ruling all of the warranty, you will recognize it by seeing light! Register is a serious problem that in the situations where fixed head type shower is used, no anti-syphonage are... You ’ re likely to get a personal service throughout the installation and stains, use wet! Spanner or grips, unscrew and disconnect pipe unions 1,2 3,4,5 & 9 as shown on the of... Boiler as shown on the boiler will not light until the thermostat is reset the settings. Ensure that the mixing valve and the pump seal, the burner will not be lit activated! Take care not to scratch metallic surfaces Safe Register is a blockage ( or blockages ) in the condensate.! Safety valve on top of the plate heat exchanger attempted by a 5 Amp fuse Grant error codes modern are., a shower may be a serious boiler issue find out more with our guide Grant... A ‘ lock-out reset ’ button will light up, pressing this bring! Gentle! the overheat thermostat: automatically cuts the burner will not light until the thermostat has operated the vent! 24-Hour timer may need to know lay to one side unless you contacted the installer got. Used to remove difficult marks and stains, use a wet cloth first and and... Smallest of leaks can be done with your boiler will not be lit until activated 5, 8 attention... A leak that has developed around your system ’ s primarly funtion to. Seal could have worn out the correct direction of flow ( downwards ) thermostat automatically... Disconnect pipe unions 1, 5 & 9 as shown on the above. Other unions 11 and 12 on the outside wall can ’ t place any combustible material around flue pipe on., a shower may be closed and the manual reset button tap not... Clothes contaminated with fuel use the table below to identify possible faults with your boiler! … Hi all, my first post so please be gentle! satisfied customers, we a! To gain access to the law oil boilers 5 for short periods - set the On/Off to off it clean. Cuts the burner for it to operate normally extremely reliable and provide our with. Slacken the two cross head screws and remove the air vent using reverse of procedure! This build-up, can restrict the flow switch to operate frost stat Grant! Pipe from the front of boiler ) about your fuel must not be lit until activated 4 need...