Hi,
Just as Christmas is approaching - I have the red light coming on (not flashing) on my 7 year old boiler. I have the installation instructions with the fault flow diagrams but am still having a problem isolating the fault. The story so far: Last week came home after a few days away to find house cold and light on, reset by turning boiler temp knob off and on, boiler fires and works for some days before having the same symptom. Resetting always seems to cure the fault short term. I have only managed to see it go into its fault condition once, so I am not sure exactly how the boiler was behaving! But I think there was power and the gas valve was opening. Going down the flow diagram I checked: the condensate trap was not blocked the fan was running I checked the spark probe and found the wire jus pulled out of the probe so changed spark & detection probes I then decided to remove printed circuits, clean around the HT areas and relay contacts and re-assemble just in case I could make the fault get better or worse! It seemed to be OK fot about 3 days but stopped again last night! The problem seems to manifest itself after long periods of in activity so is it still possible that its the connections on the trap? I assume its the acid in the condensate that lowers the resistance across its terminals. Buying a new board is out of the question as I would have to buy a new pair with wiring that cost approx £600 + vat!! Does anyone know where I could get a circuit diagram for one of these ignition pcb's?
Any other advice welcome - sorry its a bit long!
Happy Christmas