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Pool heater comes on and gas enters unit for about 5 seconds and then the gas shuts off. natural gas

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You will first need to figure out if you are getting ignition during the 5 seconds or if the valve is opening with out ignition.
If you have NO flame, inspect the ignition source. Make sure you have proper ignition.
If you DO have a flame, inspect the flame sensor. Replace sensor, do not try to clean sensor or jump sensor out. The flame sensor is part of a rectification circuit and the heater needs a well connected ground to work properly.
I could help more if I had the model and make of the heater.

Posted on May 06, 2017

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This could be the flame sensor. If you can look into the firing chamber there should be a steel rod about 5" long that dangles into the gas fire jets. Turn off the unit. If you take the fire sensor out and gently rub it with steel wool and replace it, it may start working again. If it does, great, but order a new fire sensor and replace the old one when it comes in. They are very cheap.

Posted on May 05, 2017


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