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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...

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...