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When heat is called for,the burners only lite 2 seconds

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Hello, if we are talking about a gas or propane heater, there is a flame sensor in the burner mantle. Usually these look like a wire or small cylinder the size of a ballpoint pen cap. There will be usually 2 wires running from it. If the flame sensor is bad, it shuts off the gas because your furnace does not know it is burning. It wants to prevent a buildup of unburned gas so it shuts of the supply.

Another possibility, can be a part furnance guys call a "sailswitch". This switch is higher in the furnance well above the burners. You should hear a small motor run and this "Sailswitch" detects the airflow from the small motor and the rising heat from the burner. If this switch does not work your furnance will think the exhaust is blocked or the small motor is not running. It will kill the gas to the burner. Usually the small motor and "Sailswitch" must work before the burners get gas. Since you said the burners cut out after 2 seconds, a lag time is possible.

When you go to an appliance parts outlet, like Servall, have all the information about Model, Serial number, Manufacturing date, with you to obtain the correct part. I hope my info has been very helpful to you. You may want to obtain a new part first, which will help in identifying the old part.

Posted on Dec 30, 2010


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