If the flue sensor got hot and went out heater is running too hot is your gas pressure correct if not you will soot up the heat exchange and burn up the heater also see if you have the correct size gas line that could do it also you must have a dedicated line from the gas meter
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If the flue sensor got hot and went out heater is running too hot is your gas pressure correct if not you will soot up the heat exchange and burn up the heater also see if you have the correct size gas line that could do it also you must have a dedicated line from the gas meter