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Good shout cos it’s awkward as hell to get in behind the gas valve

Biggest problem I find with them is the hydraulic Venturi affecting the DHW flow switch

I’ve worked on loads of 105e/he never seen it before myself. It was a call to Baxi tech in the end that solved it before I threw in the towel

I’m guessing a break or something in the harness creating some sort of weird fault back to the board. It’s always such a squeeze with the wiring looms from the board in that left corner I’m not surpri the harness failed.

Boiler is fixed! Polarity was good , voltage good aswell. It was the wiring harness to the gas valve which includes the spark generator. Tricky one I’ll be honest never seen that before. Thanks everyone for their input.

Yeah I agree, will check polarity and voltage today

Yeah I’m going back today with a fresh look I’ll let you all know what happens. Thanks again for everyone’s input

Yeah good shout but I checked that too

Brand new pcb and the fault is exactly the same as old pcb and it’s not an instant board defo correct pcb. Nothing else done to the boiler it was all working fine with heating and hot water up until yesterday when it tripped the power and when power was resumed it is doing as described in my...

I haven’t checked polarity yet that’s next on the plan but apparently electrician carried out testing and certification 2 months ago (rental property) and it was all fine and boiler has worked perfectly since then.

Thermistors checked and all fine, only a Drayton hardwired roomstat which is operating correctly. With hot tap running nothing happens atall , power light remains on but nothing else, diaphragm activates pin and activates micro switch and nothing happens, no DHW demand light and no ignition.

No it’s not an instant so it’s not the DHW preheat.

Nope, checked that.

Baxi 105he fault! Having a trouble getting to the bottom of this one. When there is a heating demand the DHW tap symbol flashes on/off at the same time as the pump running for 1sec on 1sec off. There is no ignition and no red fault lights flashing. Nothing happens when hot tap is running...