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Honeywell T403A1174 suddenly doesn't appear to call for heat

It is on a basic Glow Worm boiler with a Master Mind programmer, the hot water side works fine but the thermostat controlling the central heating has failed. The contacts inside had stuck together, I have freed them but, I can't get it to work at all.

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  • michel833 Feb 05, 2009

    I have since found that the thermostat is working but, for some reason, possibly because a bridge is missing in the programmer wiring, that the boiler will only work with the HW on. It seems to work OK with the HW on so, possibly a wiring problem after all.

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Some times inside the boiler on the internal pipework you will see little sensors, on the central heating piping there sometimes is a thermastic sensor on side of flow pipe with a little reset button on ? i guess with the problem you said the poiler locked out and the pipe work overheated ? this is a safety feature on some boilers not, all and easerly reset via this button ?

Posted on Feb 05, 2009

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Please give me a good rating before you sign off.

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