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Thanks Mrmethane.

Thanks Mrmethane, I'll measure it next time it lock out. will the boiler require to be drained in order to replace the thermostat? I did indeed increased both hot water and heating on the boiler. I haven't experimented anymore once i got it in sort of stable state until I have a solid...

Yes I do. Everything inside the boiler attached to the PCB works on 24DC. Do you mean 26. The hot water sensor?

Thanks Mrmethane, When I turn the hot water temp knob to a lower temp setting the produced hot water is not very hot but boiler lockouts very quickly. when I turn it to a high temp setting(almost to the end of the scale) the boiler works fine(at least worked for the last 2 weeks) and the...

schematics

Hi there are two thermistors inside the boiler according to the schematic. If I attempt to replace them is there a chance for water leakage or they are not in direct contact with the water passing through the boiler so no need to drain the system in order to replace? Thanks

Hi I edited the original post as I meant that I have to turn the main electricity switch off for a while in order to get the boiler to reset. It does this in both modes and started suddenly. It's a four year old boiler never had any problems before

Hi there We have pro combi 85 HE combi boiler which suddenly started going into lock out with solid red light. When this happens the only way to get it working is to turn the main electricity switch off for a while then the boiler will reset and will work for short period of time before...