480K Rayburn Lockout

General Aga and other range cooker related chat.

Moderators: Moderator, Admin

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
Puzzled
 
Posts: 3
Joined: Tue Jan 09, 2018 4:41 pm

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.
escort
 
Posts: 205
Joined: Wed Jan 23, 2013 8:42 am

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.
berby
 
Posts: 295
Joined: Sat Apr 14, 2012 4:38 pm

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.
john
 
Posts: 1874
Joined: Tue May 21, 2002 9:50 pm
Location: cumbria

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.
Puzzled
 
Posts: 3
Joined: Tue Jan 09, 2018 4:41 pm

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.
john
 
Posts: 1874
Joined: Tue May 21, 2002 9:50 pm
Location: cumbria

Re: 480K Rayburn Lockout

Postby Puzzled on Thu Jan 25, 2018 8:33 pm

Mystery solved.
New engineer serviced Rayburn ( was about due) and said that it looked like the baffles hadn't been properly cleaned for a couple of years. He thought that this had caused the problem. He then left and 15 minutes later the Rayburn cut out again.
The engineer came back, opened the Rayburn up again, reset it and we waited for it to lock out. As we were waiting we were chatting and I mentioned that before the Rayburn locked out previously I had heard was a short whining noise ( the sequence with the Rayburn is a whine, whirr and whoosh which I've now found out to be pump, fan and burner kicking in). Anyway when we listened to the Rayburn the engineer thought that the pump was noisier than it perhaps should be (a little whining not that remarkable though). The pump had been replaced 4 years ago but the current engineer thought one of the parts may have been screwed in too tight ( sorry I can't be more specific) . He then loosened this screw a little and we haven't had any problems since. Apparently they had had another customer with a similar problem last year .
Sorry about the non technical chapter and verse but thought I'd put it in in case it helps someone else in the same situation.
Puzzled
 
Posts: 3
Joined: Tue Jan 09, 2018 4:41 pm

Re: 480K Rayburn Lockout

Postby john on Thu Jan 25, 2018 9:53 pm

Thanks for the feedback Puzzled
Difficult for us to deduce what your engineer did , but if he fixed it then that ias good!
john
 
Posts: 1874
Joined: Tue May 21, 2002 9:50 pm
Location: cumbria


Return to General

Who is online

Users browsing this forum: No registered users and 5 guests