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...
:? 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...