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In response to my own posting and hopefully of some use to anybody else experiencing same problem. Vokera engineer arrived this morning, removed front from boiler. Replaced a part which evidently monitors the temperature,which was giving a false reading due to it being faulty. The engineer...

Hello there. My boiler is a vokera compact 24, 3 years 8 months old. Recently my wife reported that whilst showering the water was going cold, then hot again, then cold etc, for periods of about 20 - 30 seconds.Yesterday 15.02.2010 the boiler was providing no hot water at all. The red light is...