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Potterton heater comes on a then goes of after about ten minutes

My heater will not stay on and keeps going of after a short period of time

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If it lights for about 3 seconds and then goes off, you may have a dirty flame sensor. usually this sensor looks like a metal rod that sticks in front of one of the burners. it will have a single wire with a spade connector running to it. usually the ignitor will be on one end of the burner row and the flame sensor on the opposite end. you can remove the wire and take the flame sensor out. use some steel wool or emery cloth to shine it up real good. try this and let me know. if it doesn't work, give more details like make and model of furnace and approx. age.

Posted on Jan 30, 2009

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Outside unit starts but stops running in a few minutes. The rest of the a/c seems to be fine but doesn't cool

there could be quite a few problems with it. either it has something to do with the high or low safety pressure switches. Or you have a low voltage issue-not getting enough low voltage power to the coil of the contactor. how long do you wait after you turn the unit on? there is a 5 to 10 minute delay in the control board to keep the compressor from short cycling. meaning to keep the compressor from turning off then on again right away. short cycling a compressor too much will ruin it. There also could be an issue with the delay board it self. Or its a heat pump it could be an issue with the defrost board or the defrost sensor. I have even seen it to have a short in the wires of the coil of the contactor. But when that happens it will burn out the transformer or the low voltage fuse of the transformer or on the control board.

have you got it figured out already? If not can you give me more info on what it does? Or if it ever comes on after you wait at least ten minutes. Can you hear the hum the coil of the contactor makes when it is calling for the cooling. you might even have a problem with the contacts of the contactor not getting the proper power thru it to turn or keep the unit on.

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1 Answer


Many air conditioners run after turnoff. When you turn off
compressors and some heaters, they must run for a time in the
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It sounds like you have a thermocouple problem. Locate the thermocouple and make sure it is in the flame while the pilot is lit. If the pilot flame is weak, try to correct. Some pilots have a small air hole in the tip a short distance back from the flame that can get clogged with dust. Some don't have this hole. Your thermocouple may just need to be cleaned. This can be accomplished with some fine steelwool or emory cloth. Let me know if you have any questions.

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Repressurise Potterton Performa 24 boiler

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