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Thanks for you help guys. Hi Ben, the order numbers are also different. See items 131 & 135 from the image attached. Hi Josh, if it was an ignition fault, why does the DHW work ok? If the temp sensor was faulty (i.e. measuring higher temp than the real temp), the boiler would stop...

Do you mean the part numbers from overheat thermostat and temp sensor (keys 24 & 25)? They are different, plus they physically look different as well so I do not think they can be swapped.

Not sure whether this boiler has different temp sensors for CH and DHW. See images below, I can only see the temp sensor which is used for both CH & DHW, and the overheat thermostat. I must say that have measured the thermostat resistance and the reading is 0 ohm (manual says it should be...

Thanks gas112. Measured the resistance of the temp sensor and reads around 18kohm at very cold temp. Manual says it should read 11k at cold temp, which it does when measuring at ~ ambient temp so I would have thought it is ok (also resistance decreases with an increase in temperature, as...

Yep, measured that as well and loop impedance reding is 1.18ohm. Perhaps a bit higher than normal but it is the same reading as some months ago, when the boiler was working fine.

Would an electrics/PCB fault produce the fault only on the CH when hot? The boiler works fine with either DHW or CH at cold temp, so I would have thought that the PCB was working okay and it was an external sensing element or malfunction (as the PCB does not get hot) which is triggering the...

Hi Ben, thanks for your answer. What testing could I do to discard other things, before going ahead and replacing the PCB?

Hi all, Firstly, great forum, normally I get the info I need from other user's posts, but I guess the time to ask myself has come! l have a Potterton Combi Boiler (Performa 24). The DHW is working well, when I open the hot water tap the boiler stays on as normal. However I have noticed that...