The boiler will have a thermal cut out. Central heating was working but hot water cutting off. If the boilerâs thermostat is faulty, it will allow the burners to stay on longer than it should, causing the heat exchanger to overheat. Some boilers’ manuals have instructions on how to re-pressurise it, but if you are unsure, it is best to have a Gas Safe Engineer re-pressurise it for you. Check if the pipe from the pump is getting hot. we have no hot water now unless the heating is on, but it's clicks on for a few seconds then cuts out. Its an unvented system and when it cuts out the pumps are still runing. Wise Guy. we have no hot water now unless the heating is on, but it's clicks on for a few seconds then cuts out. If your condensate pipe freezes, it can cause your boiler to turn off. Two weeks later it started to cut out again, overheating. You can check your boiler’s water pressure by looking at the gauge. There are many reasons why a boiler isnât providing heat. â¢ Hot water boilers risk over-pressurization when there is a failure of the pressure relief valve and at least one other control. If your boiler has a built-in pressure gauge then you can easily check whether there is low water pressure. No problems when the heating comes on in the evening. An annual service can mean that potential problems are discovered early and prevented or fixed. Alternatively, you may find that your boiler wonât shut off at all, and this is another potential indicator of overheating. Check the Thermostat. Boiler keeps cutting out. Not yours by the sound of it. Ask Your Own UK Plumbing Question. I imagine the starter capacitor is on the main PCB, part number 2000802731. Basically your boiler is over heating and it is cutting itself off for safety ( otherwise your boiler would melt ) Tehre is a temp sensor in the boiler which checks the temp of the water, if it goes too high, it will turn itself off. I'm left with just cold water coming from the hot tap. If your boiler isn’t receiving enough water to heat, then this could cause the boiler to turn off. Three years ago the same thing happened, the potterton system board had to be replaced. had my boiler for 6 months running fine now keeps cutting out ignition lockout .condensate pipe run internally so not frozen. Unfortunately, we would need more detail than this to find the root of the problem. The boiler is working because it is warm to touch , but it doesn't heat the rads and water now. john robinson October 2010: There is more help available. The Fix. If this is the case, then having the thermostat replaced or fixed will resolve the issue. Reply. ever since we came back from holiday last week , our boiler and water were switched off btw, it keeps cutting out when i put it on. ... High efficiency, wear resistance, separation efficiency â¥ 98%, effectively improve the combustion efficiency of the boiler thermal efficiency. My engineers are confused?? Hi Steve, we need some more detail to assist you. This problem would explain intermittent starting. If your boiler keeps cutting out, kettling noises might not be the only reason â it could also be overheating. Overheating may also be the culprit if your boiler is cutting out when the central heating is on. My landlord has tried switching my control unit with his, but I am still getting the same issue. It then keeps on coming on and cutting out continually every 2-3 mins before room temp is reached. This is a brand new boiler, my last one did the same and i was advised that i needed a new boiler, i bought one at the weekend and the same thing is happening. A drop in water pressure can be caused in a number of ways, including a leak in your system or simply bleeding your radiators. There are a few potential causes that could lead to your boiler cutting out, from overheating to low pressure. If youâve got a Worcester boiler thatâs overheating it could be caused by things such as a faulty fan, pump, blocked PRV or even a condensate blockage.