Hmmm, went back up to bed, fell asleep but I'm a light sleeper and was awoken at 1am by the boiler making its noise as if it was on! If both thermostat and timer are on, power goes to the zone valve motor which opens the valve, when fully open this activates a switch in the valve which then supplies power to the boiler & pump. If the pump is always running, there are generally 3 causes for this: The speed control wire (purple, white and black) going to the pump is damaged - check continuity and connection. Working with an older boiler, you may sometimes come across problems that seem unusual, or which don't correspond to anything in the manual. This just happened all of a sudden. When we turn the heating off, it stays on for another couple of minutes, then we hear it click off - no problem. Depending on what type of heating system you have, the radiator can stay hot for different reasons. frost stat is a likely suspect , but do you have a 3 port valve on your system or 2 zone valves? Including this, there are a number of other problems that can arise with the timer to leave you scratching your head. boiler still runs even when thermostat is off Thanks for posting. The only way to stop it is to turn the actual boiler to 'heating off'. Answers. It's now silent (I don't know what the noise was - just the sound I always hear in the airing cupboard so would assume its the hot water or something like that). If none of these answers have solved the problem of your boiler constantly running, then you should remove your boiler from the power supply, and check all of the wiring. Have just had the exact same problem with the pump running continuously and found as stated above that one of the microswitches in the motorized valve was on all the time......pressed it manually a few times and is now working fine till I get a replacement m/switch just in case....thanks to whoever posted that reply it's saved me a call out. It's the valve sticking down in the heat position. Below, I’m going to talk you throug… By firing I mean that the boiler stays on after the programmers turned off - the pilot light is basically coming back on again. If the stat wasn't turning off the heating (or boiler) it (as i'm sure you will know) is being fed from the microswitch on a valve. If the pump is always running, there are generally 3 causes for this: The speed control wire (purple, white and black) going to the pump is damaged - check continuity and connection. The pumps on the Greenstar CDi range have a permanent live feed to them. The timer clock simply reaching the end of its life 6. When it's off the LED flashes and then when it fires up the LED stays on. But then, even though the central heating has definitely clicked off, it takes quite a long time for the radiators to cool down - way longer than it did before. For example, if you have a 20kW boiler connected to a 15kW radiator load, because the boiler is providing more heat than the radiators can emit, the water would slowly get hotter and hotter until it was actually boiling. Other users of howtomendit.com provide the answers. There are a few reasons your timer clock may have stopped working. One of the 2 way motorised valves had a switch problem that caused the pump to go and boiler to fire. I don't have the eco button on. Gas boiler (combi) switches off before reaching the temperature set on thermostat. The next area to look is at the programmer. Wednesday 4th February 2015. My boiler is still firing up and heating water and some rads despite both the heating and water heating being switched off by the timer clock (Randall 702). Once it becomes clear that your boiler is heating the house when it isn't necessary, you should turn the thermostat down. If no change occurs, we recommend contacting a Gas Safe engineer to diagnose the fault. Does anyone know what is wrong. A more serious problem with your boiler Could it be any of these? Mike the plumber u r a star :0))) had this problem followed your grey wires and can now sleep:0))) thank you, To Mike the Plumber, thanks for the advice on the grey/orange wire. Mechanical boiler timers explained. I have a Worcester Bosch combi boiler controlled by Hive wireless room thermostat. Update: have tried the on off button at the mains. My model no. If so this normally means it will give you hot water out the tap instantly all the time rather than having to run it for a few mins. repairs can be dangerous. If you are having trouble turning your boiler off, then the problem could be that these valves are stuck in the “on” position. Also at the same time it clicked and became lose, the noise in my airing cupboard went. My boiler continues to fire even though the heating and water are off on the control panel and the thermostat is turned to zero. I have an older system with both pump for h … read more The more detail and information you provide in your question the easier it is for others to help you. Had same problem with Weil McClain boiler which has a 3-way valve with an actuator. Conclusion. Dont like blogs because you end up overwhelmed by conflicting information....... however, last night my house turned into a sauna.... Spot on regards dodgy micro switch in valve, one tap and pump stopped. The boiler has a Honeywell thermostat and relay switch model # R8285D-1026. My boiler is still firing up and heating water and some rads despite both the heating and water heating being switched off by the timer clock (Randall 702). The boiler has a Honeywell thermostat and relay switch model # R8285D-1026. howtomendit.com costs nothing to use and you can ask a question without an account or logging in. When power to the valve is disconnected, a spring inside … my friendly plumber disconnected the valve that enables or disables flow to the heating but I have since reconnected that one. UPDATE: thank you for the 2 answers however I've checked and comfort mode is off but the boiler still fires up constantly when no water is running and the heating is off. Heating engineers are classed as key workers and are providing quotes as long as no one in your household has Coronavirus symptoms and social distancing guidelines are followed. If the thermostat is calling for heat the boiler should ideally be firing constantly until the house is up to temperature.. That depends on the design of the boiler. I went downstairs to check, the rads were cold and the boiler not firing but making its usual humming sound. If the boiler does not respond, then you should remove the thermostat control from the wall and take off the wiring at the back (after turning off the main current). 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