Will ask him to check this thanks. Since last lock out I removed cover but refitted one of two cupboard doors, so no lack of air, tripped again, doesn't trip if no doors or cover fitted. Cupboard has 2ft x 1ft hole at base, so plenty of air flow, it is very strange.
Is that because a faulty capacitor would fail when it gets hot? so prevent the burner motor from starting? or is it to smooth the voltage into the motor on the burner?
I have a Boulter Camray 5 oil fired combi boiler. Every 48 hours or so it trips then restarts first time every time the trip is re-set.
My heating engineer initially suggested this was caused by a faulty central heating pump, then suggested it may be the solenoid, both have been replaced...