Thermocouple test

If you have a multi meter, you can test your thermocouple to see if it is defective.

When you let go of the button on the gas valve and the heater won't ignite, three parts may cause this problem. The thermocouple, the valve itself and a heat limit switch if your heater has one. Of these three parts, about 80% of the time its a bad thermocouple causing the problem.

If you have a multi meter, you can test your thermocouple to see if it is defective.
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