480K Rayburn Lockout

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480K Rayburn Lockout

Postby Puzzled on Thu Jan 11, 2018 8:45 am

I have a 9 year old 480k oil fired rayburn which is regularly serviced. The cooker side is working fine, but the boiler side keeps locking out after running for a few hours. once the boiler has cooled down I am able to reset it.
When the boiler is set just to hot water it does not lock out and will happily run all day. If it is set to central heating and hot water it will lock out after a couple of hours. If however I turn the boiler thermostat down to minimum it does not lock out and will run all day. The obvious problem with the thermostat being turned to minimum is that the radiators are barely warm.

The engineer who services the Rayburn has tried to solve this by swapping the photo cell with the cooker side , when this did not work he then swapped both the solenoids with the cooker solenoids . Unfortunately neither of these things has solved the problem.

The flashing light sequence on the lockout suggests that it is not a pec problem and that the lockout is because the flame is not lit.

I did speak to a central heating engineer and he advised that as the central heating was working , albeit at either a reduced temperature or for a reduced amount of time the problem was likely to be with the Rayburn.

Can anyone suggest what action to take next.

Thank you
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Re: 480K Rayburn Lockout

Postby escort on Thu Jan 11, 2018 1:14 pm

Can be very difficult to pin point such an intermittent fault, Ignition transformer, motor capacitor and even oil pump could be causing this. Sometimes it can be a case of the engineer leaving parts on test until a cure is found unless, he can be there to witness the lockout.
I can see why he tried what he has, but did he try swapping the control boxes? That would be a simple enough test and can be done by yourself if you can remove the front panel and plinth cover.
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Re: 480K Rayburn Lockout

Postby berby on Thu Jan 11, 2018 4:23 pm

I would suspect the oil pump as it could be breaking down when in operation for the longer periods of time.
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Re: 480K Rayburn Lockout

Postby john on Thu Jan 11, 2018 10:28 pm

berby wrote:I would suspect the oil pump as it could be breaking down when in operation for the longer periods of time.


May well be Berby but this would probably also cause cooker lockout. It may be glowing ceramics preventing the solenoid opening . This used to be a common issue.
There are " delay off " timers sold for fuel saving which may in this instance hold the burner off until the ceramics cool.
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Re: 480K Rayburn Lockout

Postby Puzzled on Sat Jan 13, 2018 12:50 pm

Thanks for your replies.

The suggestion about the control box is something I'd like to try , but not being great at DIY I'm a little scared of doing anything technical so I'll wait till I get professional help.

I've got an engineer coming in on 22 so I'll put it all to him and let you know how I get on.
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Re: 480K Rayburn Lockout

Postby john on Mon Jan 15, 2018 10:19 pm

I had one where a buildup of coke in the boiler combustion chamber did exactly the same.
Something which looked like a large cinder but burnt on for quite a while after shutdown.
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