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It does not get as far as a spark as it fails on the PCB checking the flow thermistor.

I had hope for some constructive help from this forum, not insults. Paul

I have changed the flow Thermister although its resistance is exactly the same as the old ones. This is fed by a pair of red wires. My boiler does not have a return Thermistor although it has the two blue wires in the harness that the wiring diagram showgo to a return Thermistor but it just...