Cynic wrote:
The oxypilot is carefully factory set so the flame just impinges on the
tip of the thermocouple. If the oxygen content of the available air
reduces (flue gases spill back into the roomspace) the flame lifts off
the tube seeking oxygen and in so doing ceases to contact the
thermocouple. The thermocouple cools and the gas valve closed.
The assembly must be kept clean as the slightest obstruction will prevent
the thermocouple heating during the initial light up of the appliance.


Well yes, but its not rocket science and nor is it €œcalibrated€�. Its just
manufactured to hold the thermocouple in the right place without needing
any post-installation alignment.

If it were mine and it had a faulty thermocouple, Id try fitting a
universal thermocouple in its place. Clearly a step to far for the OP
though.

Tim

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