oil tech guys. burner lock out on worcester heatslave 20/25

[manortim]

It's the benetone type burner on it.

Been out to this 1 and found issue with the expansion vessel and hose to the vessel blocked. Sorted that all good.

The burner motor was screaming like a good'un from shot bearings, had a spare 1 so fitted that and she ran smoothly and quietly.

Custard mentioned that the burner locks out daily at any point but once the reset on the burner is pressed, it works fine.

I checked pump pressure, replaced nozzle (it was lucky) checked the fuel flow to boiler, checked the combustion. No clues there and not a lock out in sight.

Custard ran it over Xmas, it ran fine for 3 days since ii checked it over and for last week every day its locked out and needed a reset, once reset, it works fine.

Intermittent faults make my hair fall out!

Any thoughts?

 

[Agile]

Did you inspect/clean photocell window?

Did you measure ignition gap and/or clean insulator?

Tony

 

[dcawkwell]

Coil or solenoid valve beginning to fail usually causes intermittent
lockouts.

 

[Terrywookfit]

EBI ignition Txfr.

 

[holty]

i would say coil. but ignition electrode leads need checking. only way to check coil is when it does lock out. then check for resistance. to see if the coil has broken down.

 

[oilman]

Terry is right for this fault IMO, though I had one where the capacitor caused the same results when it warmed up. I found it from the flue gas measurements which were fine at start, but got worse after a few minutes, - sometimes.

 

[manortim]

cheers all.

its not the capistor as it has a new one on now when the motor was replaced.

will change 1 thing at a time to pin point it. starting with the transfomer tomorrow.

cheers again.

 

[Agile]

Just because a part is nearly new it does not mean that it cannot be at fault!

 

[manortim]

Just because a part is nearly new it does not mean that it cannot be at fault!

that is a very true comment!!

 

[snb]

as with terry i would go with ignition transformer. very common on these. Often you can see the casing starting to deform