If the boiler is reset, does it ignite for a short time and then extinguish?
Check the detection electrode and associated harness for continuity, visual condition and position. Check if the condensate pipe is blocked.
Is the gas pressure avaliable at the boiler > 18mBar
Check gas supply and rectify fault
Is 215Vdc avaliable at the gas valve during ignition?
Check wiring from gas valve to printed circuit board (PCB) and replace if necessary, otherwise replace the main PCB
Unplug the gas valve – is the resistance between the pins between 1kW and 10kW?
Replace gas valve
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