Got a problem on this ideal mini, at first would only fire on H/W for about 10 seconds boiler lit then would shut down, at first I thought overheat stat via the fault finding guide, I then tried linking it out still no C/H nor would boiler fire in H/W mode, so I put wires back on the stat, I then spoke to tech help who said it's deffo the C/H thermistor preventing the boiler from lighting, iv changed the thermistor and still nothing! Seems to run through the sequence then locks out showing ignition fault I think it said! Is it possibly a faulty pcb ? It's the model with 1 pcb board. Possibly dodgy relay ? Hope somebody can help with this! Without giving smart arse comments!! Many thanks