Rayburn 400K

[Uncle Nick]

Hi all, I’ve a Rayburn 400K (cooker only) which has a Ecoflam Minor 1 oil burner, that I suspect needs a new pump but I’d like some help please before shelling out on a new one.
The problem is that it keeps going to lockout.
I’ve checked the oil flow to the pump and it’s fine. I’ve bled the pump and there doesn’t seem to be any air in the line.
When switched on after bleeding, the burner fires, runs for about a minute and goes to lockout.
After resetting it purges and then goes straight to lockout without firing.
It seems to me a fuel starvation issue but I don’t understand why it runs ok at first after bleeding.
Any ideas?

Thanks in advance.

 

[Uncle Nick]

Yes, I used it to rule out the photocell.

 

[SJB060685]

Ok. Did you check cell to see what microamps you were getting?
The Danfoss coils on that burner are a common fail point. Usually when they fail they do so within in 10-15 minutes after ignition. They break down internally where you would get a zero resistance reading or no continuity, often they can fuse back together and you get the problem you had, alternatively they remain OL (open loop) and never work again. The new Danfoss diamond coils are supposed to be a lot more robust but still not without their problems. If you find you're going through several coils then I would consider changing the stem on the pump. I can explain to you why if you'd like or you can just bare it in mind.

 

[Uncle Nick]

I’ve just checked and there’s no continuity between any of the three terminals on the solenoid. Was that what you meant?
As far as I know, it’s the original coil so will be 8 or 9 years old. Hopefully I’ll get the same from this new one, although the engineer did recommend keeping one as a spare, which doesn’t bode well for his ideas on future reliability.

 

[SJB060685]

Danfoss coil yes?

 

[Uncle Nick]

Yes, Danfoss 071N0051 which has been replaced by the 071N1006
“Danfoss Upgraded Replacement Solenoid Coil

Offers better reliability than standard BFP Coils”

 

[SJB060685]

Yes. So you should have two terminals you should have continuity on.

 

[Uncle Nick]

Yes. So you should have two terminals you should have continuity on.

No absolutely nothing, failed completely.

 

[SJB060685]

Are you testing the new coil or old?

 

[Uncle Nick]

Old. The new coil is on the pump.

 

[SJB060685]

I assumed that but was unsure. Yes the old coil is completely dead. You should have continuity between the live and neutral connections. My multimeters read OL when checking for resistance but others read OC (open circuit). Both mean the same thing, the coil windings have broken down.

 

[Uncle Nick]

Yep, easier and cheaper fix than I dared hope for!

 

[SimonG]

Ok. Did you check cell to see what microamps you were getting?
The Danfoss coils on that burner are a common fail point. Usually when they fail they do so within in 10-15 minutes after ignition. They break down internally where you would get a zero resistance reading or no continuity, often they can fuse back together and you get the problem you had, alternatively they remain OL (open loop) and never work again. The new Danfoss diamond coils are supposed to be a lot more robust but still not without their problems. If you find you're going through several coils then I would consider changing the stem on the pump. I can explain to you why if you'd like or you can just bare it in mind.

I dont find the 'improved' coils to be any better at all.

 

[SJB060685]

I dont find the 'improved' coils to be any better at all.

I'm not convinced either

 

[Uncle Nick]

I dont find the 'improved' coils to be any better at all.

Oh dear, that’s not good. Wait and see I guess!