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Thank you both for replying. I'm fairly confident myself it's the pump. I know the pump is at least 12 years old (not sure how long they are designed to last). One final thing please (more for my interest). Is there some sort of flow valve or detector that tells the boiler the pump hasn't...

Thank you for that, very helpful. I was wondering if it might be the pump. Any advice on a quick way to check if the pump is not working. I don't have the facility to check the voltage as the flow diagram suggests.

I have a Ravenheat RSF 820/20 combi boiler (15+ years old) which has developed a problem. I was made only aware of it today as it's the first day I have felt the need to switch on the central heating. It has and still is functioning fine when it comes to hot water however select central...

Hello all, I have a damp patch in one corner of my dining room approx 45 cm in height and 30 cm across on a single skin internal load bearing wall. The dining room wall side is plastered, the other side (under the stairs) is only painted. House is 'Kettering Brick' end of Terrace (built...

How very silly of me thinking you were actually from Pakistan. Oh well. Anyway (thanks to you) I am now convinced it is the PCB. When I depress the ignition switch to fire the spark this actually engages the fan on high speed mode. So the motor isn't burned out. Furthermore when I measured...

Thank you very very much . I will go and buy a voltmeter today to check this and let you know the outcome. As the fan (in the UK) is not cheap I really didn't want to buy a new one only to find out this wasn't the cause. If indeed it is relay 2 on the printed circuit board, is it...

More information - just spotted something I missed before. The fan does work correctly when the pilot light is on and it is idling. However when you active the heating/water rather than the fan speeding up, it actually slows down until it stops. Is this an issue with the fan or some...

Hello, I have a Ravenheat RSF 820/20 combi boiler. This morning both the heating and the hot water failed and I'm stumped. The pilot light is on and gives a strong flame. I inspected and cleaned the internal extraction fan and it is rotating as normal. I blew into the plastic tube...

Thanks ALOT Chris, REALLY appreciated :)

Would anyone be kind enough to send me a schematic/wire diagram for the Ravenheat RSF 820/20 Combi Boiler (fan assisted). On numerous occasions I have replaced parts on this old but reliable boiler and am very keen to further my knowledge on the working of this model. Having spoken at...

Right now I understand. I will replace the PRV again and this time not use it to drain the system. There is an alternative way to drain the system via a tap, my own fault really. Thanks alot for pointing this out.

Guess what, the filling loop valves at both ends are leaking. The mains inlet valve even at the off position lets through a steady drip drip of water. The inlet valve at the central heating end (seems to be some sort of one way valve) is also leaking. Thanks very much, I will see about...

Right thats interesting, the filling loop has never been removed so this is something I need to investigate. I know the gauge is correct as it's brand new. Could you explain what you mean by HE is passing, I don't understand this. Many thanks btw for replying.

I have a long standing issue with my combi boiler, a Ravenheat RSF 820/20 which I guess is 10 years old now. Over the years I have successfully replaced many parts HOWEVER one issue remains. The 3 bar pressure release value leaks even at pressures below 1 bar. This I do not understand as the...