Yeah solenoid clicks and pump draws fuel, then few seconds later boiler goes lockout.When it doesn't start at all do you hear the solenoid click?
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Yeah solenoid clicks and pump draws fuel, then few seconds later boiler goes lockout.When it doesn't start at all do you hear the solenoid click?
Yeah motor runs.So when it doesn't start at all the motor runs, you hear solenoid click and see fuel flow but it doesn't ignite at all? If that's the case I'd suspect its ignition related. Electrode gap wrong, dirty electrodes, weak HT leads, weak spark from ebi transformer or arching elsewhere, porcelain electrode covers need to be checked. Control box possibility as well
It’s very frustrating with it being intermittent. The other half is getting annoyed and stressed with it.It's one of those where theres only so much I can do through a phone for you. If I was the engineer attending and based on what you've said (assuming I haven't misread you) is I'd be looking at ignition first. I say that because motor is clearly running, you say you hear solenoid click and see good neat fuel flow, so saying that it's either an over aired problem (which by now we think not) blowing spark away from nozzle, a problem with the ignition, be it arching elsewhere etc, or a problem delivery the fuel. I've never experienced it but those that have taught me always consider a blocked HP line from pump to nozzle outlet as well.
I can tell you how to safely check spark function and quality but its probably best left to the engineer, I do not want to be responsible for something you got wrong.
Yeah not much left to replace, the coupling was replaced with new pump.
New engineer says that the excess air amount that’s registering on FGA is ok.
He looked at electrodes when he had burner apart and said they look ok, couldn’t see any sign of arcing other than where should be.
My heating engineer was telling me the gap between electrodes should be about the thickness of £1 coin.Your screen shot shows a electrode gap of 2.5/4.5mm, I would suggest ensuring this is nearer the higher end, say 4.0mm, also it shows the electrodes positioning as -3/-1mm back from the nozzle tip, I would suggest making this as near the nozzle tip as possible, say -1mm or even 0mm., my burner (a riello, has a 4mm gap with electrodes extending 2.5/4.5mm beyond the tip). Also ensure the nozzle fitted has the correct spray angle, mine is 80 deg.
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