ravenheat rsf820/20 combi

creader · 11 May 2007

i have a ravenheat rsf820/20 about 8yrs old recently the boiler cut out with some very strange clanging noises,when i tried to relight it, boiler fired up even though no hw or heating was on ,the pressure built up really quick to the point where it cut out again.any ideas is it repairable or has thing had its day? creader

werewolf · 11 May 2007

poosible gas valve gone faulty and firing up even though no electric supply.Boiler not worth repairing, throw in bin and get good vaillant/worc boiler fitted.

gas4you · 11 May 2007

Blocked heat exchanger?, faulty pump? Banging usually no circulation

werewolf · 11 May 2007

If the electrics to boiler are OFF then gas valve must be jiggered .see previous post.

gas4you · 11 May 2007

Have I missed something? Where does op say electrics are off

corgiman · 11 May 2007

werewolf said:
poosible gas valve gone faulty and firing up even though no electric supply.Boiler not worth repairing, throw in bin and get good vaillant/worc boiler fitted.

how does that work then??

surely in the very unlikley event of this happening (no switch live and boiler fires up) you are looking at the PCB relay

I really cannot believe this could ever happen, more like a sticky flow switch

PS this is a combi ravenshit aint it?

sambotc · 11 May 2007

Agree DHW flow switch possibly stuck seem's the likely culprit..

Agile · 11 May 2007

The diverter valve is probably jammed and creating a phantom demand for DHW.

Could also be caused by water leaking onto the switches.

Tony

ChrisR · 11 May 2007

Maybe one switch is stuck on brnging boiler on without the pump. Otherwise sounds pcb relay ish

pannierstan · 11 May 2007

I agree with Corgiman.

probably find water is peeing from DHW connections on h/ex and then dripping onto the board.

Either that or the relay is stuffed and has now turned into a blob of molten plastic also stuffing the board and the connector behind it.

I have a board and a set of new connector plugs just for this occurence which has happened many times.

Stan

Agile · 11 May 2007

I also have a spare pcb which from memory used a Finder relay which never fails.

Neven have I ever found a PCB failing on this model. Everything else and particularly the diverter valve though.

Tony

Slugbabydotcom · 12 May 2007

If anyone is taking bets my money is on the flow switch stuck in the on position as well. I have changed a few pcbs but never come across the relay sticking on so far.

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ravenheat rsf820/20 combi

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