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We change the burner for the water heater, it stay li ari=ound 35 minutes, heat the water and after is turning on completely, even the small flame don't stay lit. What we need to do?

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You mean it is only staying on for 35 minutes, if this is the case, then readjust or replace thermal coupling, if bad it will not sense the flame or pilot light. it has to be in pilot light flame as to work properly. ( this is for a gas hot water heater). if bad it will shut gas off to heater.

Posted on Aug 05, 2010

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Get more fresh air to the unit.
Clean the air intake/ flame trap/ flame arrestor located on bottom of tank.
http://waterheatertimer.org/images/Flame-trap-inspection-325.jpg

Post question on pro water heater forum.
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Add a comment with type of gas control valve, for possible troubleshoot.
Copy following link to read service manual by type of gas control valve:
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Make sure thermocouple tip is seated inside the burner flame.
Make sure thermocouple is not overtightened. Finger-tight + 1/4 turn.
If the pilot lights, then ECO energy cut off is not tripped, but gas control valve might be bad.
Check color of pilot flame: it should be strong and clear blue.
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Increase air supply to water heater. Open a window and see what happens.
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Check gas pressure.

Open following links for troubleshoot resources:
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Rheem gas water heater it won't stay lit...will lite up and go off after 20 seconds or so. If I leave it sit for 20 minutes the exhaust fans blows but no flame and I have to turn off gas and refire up to...


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The system must detect a pilot light prior to turning on the main gas valve for systems with a standing pilot light (not sure what your system has) and on systems with auto igniters (spark or ceramic heat glo) the control board must detect a flame present at the main burner a few seconds after the main gas valve turns on.

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To check the vacuum swich on the blower a multi meter across the switch terminals looking for a steady "state change" as the blower runs/stops will work.

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