Hi all, Hope somebody out there can help me with an intermittent fault with my Powermax 185. Note that the boiler is set to 24 hour mode for both heating and hot water.
Roughly once per day the boiler will not react to the central heating or hot water falling below temperature. The central heating will just go cold. When you turn the roomstat you can hear it click but you cannot hear the pump start. When you run the hot water (or more annoyingly take a shower) the water will run cold. Basically the burner is not coming on when demanded. To clear this fault the boiler has to be switched off then back on again, the burner then lights and all will be fine until it happens again. Note that the boiler is set to 24 hour mode for both heating and hot water. I have checked that the hot water l.e.d. and central heating l.e.d. are lit when the boiler is in the fault condition.
Thanks for that ill take a look next time the fault occurs. I should mention that i'm an electrical/instrument tech by trade so i do work on industrial gas burners. Of course i'm not qualified to work on domestic systems but If anything is wrong electrically i should be able to work through it if somebody can point me in the right direction. Thanks.
I meant to ask - how are you getting the boiler to re-start after it has stopped, or does it do so by itself? If the latter, I suspect another cause than the overheat stat, as this requires re-setting manually (at least it does on the Powermax 155X).
You have to reset the whole boiler by switching it off and back on again, when you switch the boiler back on the burner then fires up and all is ok. Thinking about it I don't think it will be the overtemp stat as I seem to remenber that this trips out when it detects an overheat condition and has to be manually reset. The fault has occured a couple of times this week but ive not been here to have a poke around with a multimeter.
Post by Alain Dufour on Aug 24, 2019 11:50:55 GMT -5
I bet your question is old now and you might have sorted it out since ? I had the same problem and it appeared that each time it was the PCB faulty. It happened to me 2 or 3 times over 3 years I used new part for it and then reconditioned as I had one in stock. Now I am relocating the boiler and the old one which is working perfectly since XMas is for sale or parts. I even have a reconditioned PCB in stock (in case) I have put it on eBay N° 183926910202 and it is available for viewing working. Alain Dufour 62 Northwood Drive Sheffield S6 1RY 0114 21 66 22 9 firstname.lastname@example.org Read more: powermax-repairs.freeforums.net/thread/170/locking-out#ixzz5xXPPdHW8