Question about Honeywell Programmable Thermostat Heater

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Honeywell ST6400C programmer

The boiler does not fire when hot water is selected although the red light is on. However, the boiler fires OK when central heating is switched on and this does then heat the water. Is the problem in the programmer?

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  • fairfordmick May 11, 2010

    sounds like a wiring problem what type of motorised valve have you 3port or two 2ports

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  • Honeywell Master
  • 2,365 Answers

Hi yes sound like it not working on hot water only it would check ou the wiring on this side

Posted on Feb 18, 2010

  • Steven Robinson Jun 13, 2013

    the red light comes on when hot water is selected and the boiler does as well, just the pump does not come on

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