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Yep I had the same issue which requires a few presses of the resetting etc might be best to wire the boiler into a ups to save having problems
Discuss Worcester boiler pump runs for hours in the Central Heating Forum area at PlumbersForums.net
Thats the confusion! My gas enginner who serviced it last week put a new PCB on it and was rather lost by the problem. "the pump can only run if the PCB tells it to" was how it was left but the PCB is new. No fault codes or anything. WB are also lost and can only suggest get engineer to phone them when the boiler is opened up to test each component - maybe I will do that next year at its service. It would make sense being frost protection but if it was a sensor or something then I don't get why it only does this if unit is turned on from the mains without a "demand" but if there is a "demand" at time of turning on its all ok and functions normally and its pump turnes off as expected, i would expect the fault all the time. Looks something i will just have to live with, thanks for your help.
Don't think there's any frost stat as such, when/if the boiler flow temp falls to 8C the pump only runs, if the temp hasn't risen to 9C in 30 minutes then the boiler fires until theThe problem with turned out to be a faulty frost stat.
The boiler keeps the pump running when the frost stat activates but will not heat the water until the water temperature drops below 9 degrees.
If you have a frost stat try disconnecting the switch wire in the frost stat to the boiler.
Did you ever resolve this problem? Ours has been doing the same thing, identical to your video.Update:
I've taken a video:
It shows 24°C in the video before I stepped into the shower earlier. After the shower it was around 55°C, but now 30 minutes later it's only dropped to 53°C, which doesn't seem to be dropping that fast.
I turned the Eco mode off, then back on again, then held the reset button to reset the boiler. It then started to short cycle, and the temperature has now dropped. The boiler is now quiet and remains silent.
What on earth is causing this?
I've been having exactly the same problem that you describe. Reading your post about cycling the power with the 'demand' active also worked for me - brilliant!, I hadn't been able to work out why a reset sometimes worked and sometimes didn't. I was on the point of replacing the PCB but from what I read here this would have been a waste of money,As I said in my 1st post - the only way I have worked out to stop this is if there is a "demand" any demand, that could be heating, hot water or water heating if eco button is off, as soon as boiler turned on from the mains. So long as the fan & burner run immediatly the boiler is turned on once that initial demand is stopped the pump will stop just as it should after its 3 min overrun period. But without that
Hi. I have tried everything you mentioned. No, after about 20seconds from power up it starts its pump (just pump) and runs forever. If CH or HW used during this running that works normally but the pump continues afterwards and continues constantly and doesn't stop after normal overrun period.
As I said in my 1st post - the only way I have worked out to stop this is if there is a "demand" any demand, that could be heating, hot water or water heating if eco button is off, as soon as boiler turned on from the mains. So long as the fan & burner run immediatly the boiler is turned on once that initial demand is stopped the pump will stop just as it should after its 3 min overrun period. But without that instant demant on power up the pump will start after about 30seconds and never ever stop. So unless by chance the room thermostat is turned up & the heating set on on when the power comes off the boiler will do its constant pump running, that means any powercut in summer for sure will send it into its constant pump running.
Reply to Worcester boiler pump runs for hours in the Central Heating Forum area at PlumbersForums.net
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