Oil boiler flame cuts out but no lock out and cycles continuously

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oilypig

Hi
Any ideas please?
The boiler runs fine for 20 minutes approx then flame cuts out the oil pump continues to run The flame relights for a couple of seconds and cuts out again. This then carries on indefinitely, pump running all the time flame relighting and going out every few seconds.
It does this in or out of boiler chamber.
I do not have to press reset to get as the pump does not stop running.
I have emptied/cleaned the filter/water trap.
I have bled the pump.
There is about 6" of fuel in tank.
It is an old system been working for years.
I have measured resistance of flame sensor with light on and off and it seems to work ok going from high to low resistance when light shined on it. Also checked nothing blocking detector from seeing flame.
It is a Grant euroflame 50/90
Thanks
 
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Just a thought - when you cleaned your filter bowl, was there much water in there? and how did the filter look - that could give you an indication as to the condition of the pump filter. Personally Id leave that til last resort, the pumps dont like being opened and closed again..
There's lots of stuff an engineer could try with the right kit but most of it we cant really talk you through.
 
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jensda said:
most coils only start acting up when hot but check pump filter first and it costs you nothing
Click to expand...

Exactly. Op states runs ok for 20 mins then starts playing up. He also says later that if left for an hour, it's ok for a bit, ie coil cools down.
 
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ok thanks muchly for all suggestions.
I have now cleaned filter in pump and checked free flow of oil into it. Not much crud at all and certainly not blocked.
Ran it with pc unplugged as a double check and it just locked out as expected.
Will try changing coil as that seems consensus? Failing that the control unit maybe?
Will post result.
 
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Check your meter is on AC and that your tester is fully in to make the connection, because poking it in the back of them plugs can be a tad tight. But yeah if your not getting the voltage, then to me that seems like the problem.
 
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Yes its 7 and thats counting from the left with 2 blanks included
I do have the voltage from pump so going for coil for def.
cheers will report
ta muchly
 
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Might well be solenoid in this case, but Riello oil pumps cause same symptom sometimes. Seen them running for a many minutes from cold start & then "slipping" causing the burner to try to ignite again & again in little bursts.
 
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kimbo said:
Could be faulty oil pump that when gets hor loses pressure. Check with gauge. If it was photocell I would expect it to go to lockout. I would then go for control box. There could be more than one fault
Click to expand...
As said earlier check with gauge
 
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Hi all,
Have now replaced coil.......no change, runs for 20 mins from cold and then turns off and when restarts just cycles round flame starting up and cutting out after a few seconds, but no lock out.
Same inside chamber or out incidentally.
So.....Oil pressure from pump or photocell(which appears to work on a simple ohms test) or control box?
Thanks again for all the help.
 
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