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Mick Great, i've given it a clean out and hay presto it's firing up first time every time. Thanks for the free advice, probably save a small fortune or being ripped off. :D

ok i'll have a look at that today. How does the system know when the pilot is lit as theres appears to be no thermo-coupler. technology obviously moved on from days

yep i'll try there first as rob also thought it may be that. should the electrode actually be in the pilot flame or just below. it's currently just below and as i said just continues to spark even when the pilots lit

thanks i'll try there first then.

boiler problems yet again. Have a ultimate 50ff boiler which fails to fire up most of the time When the boiler is called for the following happens on the circuit board The Switch Live, and thermostat, and air pressure switch are successful and lights leds, pilot / PCB proved led remains...