Rayburn 480k mostly not firing

[october21]

Having troubles with the Rayburn 480k and possibly supporting plumbing.
When the Rayburn is cold it will fire but only one side cooker or boiler, you can not have both, and boiler is more reliable than cooker, I also think that the diverter valve or cylinder stat is not working but need hot water to pump before being able to check. The Rayburn will run for 6/7 minutes before stopping for 10 minute rest may or not fire and run again, not because of room thermostat temp.
Any advise would be welcome to get cooker and boiler working together.

 

[october21]

mmm had phone call at work just after lunch to say that the third engineer had arrived. I arrived home to a cooked roast dinner and a tank of hot water. A sentence I thought I would never use. This guy and his son need knighthoods, we on the other hand got a new a built-in programmer, a cooker thermostat and (on order) the motor, electronical top of a diverter valve. The Rayburn also needed and was given a good clean out, something that had not happened for 3/4 years, my second year in the house. It really is like a new machine, maybe, this will save my Rayburn relationship because so far it was just a lump of scrap that looked the part.

 

[Best]

Thanks for the update. I refuse to work on those Rayburns, so couldn’t advise.
Personally I think they are over complicated.

 

[Ben-gee]

Pay that guy well and get him to service annually and you’ll be warm and happy.

 

[october21]

I wish the first two 'engineers' also had refused to work on the rayburn 480k

 

[Ben-gee]

Sometimes one’s genuine desire to help outstrips ability or knowledge often with good intentions- but yes it’s best to say sorry pal I can’t help you this.

 

[WHPES]

They're not that complicated if you actually bother to follow the wiring and circuit diagrams