Glass becomes cold at high fire

From the choices you have made the problem you are experiencing
is most likely to be caused by problems with :

The most likely causes are:	Remedial Actions after overhaul are:
Insufficient Gas supply pressure Incorrectly set up zone gas regulator Poor Air/Gas ratio setting Sting out heating up thermocouple head Combustion air control valve/actuator incorrectly set	Check/Adjust Supply pressure Check/Adjust zone regulator Check/Adjust Air/Gas Ratio Check/Adjust Air/Gas Ratio Check and adjust to give correct min/max fire pressures

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