Question about Hayward H Series Millivolt 250,000 Btu Pool Heater H2501

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Hayward pool heater pilot won't stay on

Put a new thermocouple in and it still goes out. has a good blue flame when button is depressed but et go of the button and the flame dies

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  • Anonymous Mar 22, 2014

    looking for this manual - ET-3



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A short circuit in the heater wire will cause an immediate loss of all flame, pilot and main; check the wiring diagram and make sure your pilot wires go to the PP and PP/TH terminals; make sure the terminals are clean and the connection is good; you are dealing with .320 volts DC, any bad connection drops the voltage below the required minimum.

Posted on Jun 28, 2009


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Thank you for posting your question here on

Make sure you did not reverse the red and white lead wires from the thermocouple as doing so will not hold the solenoid for the pilot open. If the wires are connected properly start next with the pilot head. You want to be sure the pilot flame is not partially blocked or that the gas mix is poor which you can tell by whether the flame is a nice tall, bright blue color or not.

If that checks out you need to check gas pressures at the inlet to the valve and to the pilot and check the gas valve itself for a bad solenoid.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at Positive feedback is appreciated once your problem is solved!


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