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Thanks Dave. I did ring the engineer back. He was surprised as he did say the NTC was definately not showing any reading and was the likely fault. He also said the same as you. That he would check the loom wiring in case there was a short and bring a replacement second hand PCB which he knows is...

Thanks for the advice dave. I checked the reistance on all three sensors (removed) which was identical, so I presume they are ok. I do have a spare which I bought off the engineer who came as they seemed pretty easy to install. I may exchange them one by one and test run for errors in case...

I have a problem with a vaillant combi boiler with the digital temperature sensor which occasionally seems to fluctuate and flicker wildly. This also seems to cause the odd lockout of F64 (Electronic failure) which is usually fixed by resetting the on/off switch. I have had a Vaillant engineer...

Quite. However, the fact that the microswitch is engaging doesn't tell me if any output is leaving the attached circuit board within the clock. I think I will upgrade the clock unit anyway to a digital version. If that doesn't work, the fault is almost certainly with the main PCB board. I just...

No, not really Tony. The clock just plugs into the front of the boiler, like changing a light bulb. The microswitch is disengaging as I disassembled the mechanical part of the clock and removed the part that actuates the microswitch to make sure. However, it might be the on position that...

My boiler is working perfectly well except the clock has ceased to function. It is the basic analogue clock. The motor mechanism to turn the clock is functioning and the microswitch in the clock is operating when it reaches the appropriate point on the clock. It is on all the time. Is the...