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Thanks for the replies yes you were correct chrisr it was A3 not A4. I placed the short across T2 & 4 but to no avail. What did seem odd to me was measuring across the disconnected A3 timer plug(black wires) I seemed to get an o/c?? I measured across the thermostat terminals 1&2, when asking...

Basically my c/h isn't working when the thermostat is asking for heat!! There are no warning lights.

:? Can anyone please help advise me with a problem I’m having with the c/h on my Baxi 105e combi? With my limited experience and by following the fault diagnosis from the Baxi manual, the symptoms I’m seeing are pointing towards either a faulty clock or maybe PCB. There appears to be no...