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Pilot on Hayward pool heater will not stay lit after release...New millivolt generator was installed...No change...New gas valve was installed...Changed to 24V w/ new thermo couple and transformer...No change...Could problem be with control curcuit?

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  • reelaffair Sep 10, 2009

    Problem: Pilot will not stay lit after release...Generator was replaced w/ new on millivolt system...Pilot would still not stay lit...Changed out gas valve with new 24 volt system including new thermocouple and new transformer...tested for voltage (26 volts)...Pilot still goes out after release...Need to find solution to keep pilot on after release...Flame is blue, on thermocouple and full when held down...As soon as release - pilot goes out...Is problem electrical?

  • reelaffair Sep 10, 2009

    If it was a ventilation problem wouldn't there be a problem w/ the initial flame?...Flame when first lit looks perfect...After lighting and holding down for approx. 60 sec flame goes out...Same problem on both millivolt system w/ new generator (power pile) and new 24 volt system w/ new thermocouple and new transformer...All connections are tight and clean...

  • reelaffair Sep 10, 2009

    There is no environmental factors contributing to the situation...In both instances pilot does not stay lit after release...Again, installed new generator on existing millivolt gas valve...Pilot did not stay lit after release...Installed all new 24 volt gas valve, thermocouple (24 volt) and transformer (24 volt)...Pilot did not stay lit...Both gas valves are White Rogers, 3/4 inch on a Hayward pool heater...Both instances pilot does not stay lit...Both generator and thermocouple test OK...Pilot lights as should...after approx. 60 seconds, when release - pilot goes out immediately...

  • reelaffair Sep 10, 2009

    There is no control board...Remember this is a millivolt system retrofitted w/ a 24 volt system...Gas supply is more than sufficient and is constant...Each time pilot switch is depressed, pilot will light - once released, pilot goes out in both applications...Main burner never receives signal to ignite...

  • reelaffair Sep 10, 2009

    Thermocouple is matched to gas valve...I guess I could jumper across gas valve connections to eliminate switches, fusible link (if applicable), temp control...

  • reelaffair Sep 10, 2009

    There is no control module...There is no silver box...Purpose for millivolt system is remote location away from electric... This application is driven either by 750,000 millivolt (first application) or by 24 volt (second application) where as I brought 110 to power the transformer

  • reelaffair Sep 10, 2009

    Thanks for your help...Unfortunately, I have to put this problem aside until tomorrow...I will once again resume troubleshooting in the AM...System was left w/ the 24 volt application...I have a tester...Will contact you early on Friday...Thanks again

  • reelaffair Sep 11, 2009

    There is no control board...Original system used a millivolt generator (power pile)...No external elec. was necessary...After installing new generator, pilot still would not stay on when switch was released...New 24 volt system was installed w/ new gas valve, thermocouple and transformer...External elec. was brought in to power up transformer...Pilot lights fine...blue flame...high...steady...When release switch (after approx. 60 seconds)...Pilot immediately goes out...

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6 Answers

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The thermocouple that senses the pilot is lit would have been my 1st guess here, but u have replaced it and all the other common components that would cause this including the gas valve, the next step would be to replace the electronic control board if that is where the thermocouple signal is sent to keep the pilot lit and allow the gas valve to turn on, this is only logical to this tech..

Posted on Sep 11, 2009

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If you have replaced the gas valbe and thermocouple the only other option is your CC board. Normally its the gas valve or thermocouple and very rare is it the board. Make sure your gas line has no leaks and is supplying a steady supply of gas...

Posted on Sep 10, 2009

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The control circuit is not working correctly. If the thermocouple that you replaced is sitting directly in pilot flame the control takes the signal and produces the output for gas valve to light. Inspect control board for visual damage and check all connections going to board. Replace control board.
(make sure that replacement thermocouple is the exact same one as old one, very important. Different numbered therm has different output)

Posted on Sep 10, 2009

  • 3 more comments 
  • Craig Butler
    Craig Butler Sep 10, 2009

    Do not jumper out control components. That's how people get hurt. Replace control board.

  • Craig Butler
    Craig Butler Sep 10, 2009

    There is a control module, that's it, change it.

  • Craig Butler
    Craig Butler Sep 10, 2009

    Does't this unit have a silver box about 4" by 3 " with the wires for control and gas valve?

  • Craig Butler
    Craig Butler Sep 10, 2009

    Do you have a meter that we could test a few things with, I have a few checks I'd like you to do?

  • Craig Butler
    Craig Butler Sep 10, 2009

    Thermocouple has to provide the millivolts to pull in gas valve. That's it, we need to look at that. I need you to check the millivolts comimg from the therm while the pilot is lit...can you do this?

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This type of problem is most commonly caused by environmental factors: High wind gusts, excessive rain or a sprinkler head forcing water into the cabinet.

Other reasons could be low gas supply, failing pilot generator, a bad gas valve, slight blockage in the pilot assembly.

You have replaced the millivolt generator and gas valve so this should not be the reason now.

Are you sure that the environmental factors are not causing this?

Please provide more detail: either it not light up or just the flame goes off immediately after lighting.

Posted on Sep 10, 2009

  • Adnan Bhatti
    Adnan Bhatti Sep 10, 2009

    The millivolt generator and other pilot lighting systems are not the problem if they can ignite the pilot.
    The problem is that the gas supply cuts off after some time.
    Wait and check if it lights again after some time. If it is cycling on and off the please report.
    If it stays off then there is a problem with the control board: it turns off the gas supply.


  • Adnan Bhatti
    Adnan Bhatti Sep 10, 2009

    The millivolt generator and other pilot lighting systems are not the problem if they can ignite the pilot.

    The problem is that the gas supply cuts off after some time.

    Wait and check if it lights again after some time. If it is cycling on and off then please report.

    If it stays off then there is a problem with the control board: it turns off the gas supply.

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You may have a problem with ventilation here..also if the previous themo couple was different then u need to get an exact model for it..but by the sound of it, seems that air flow could be restricted.

Posted on Sep 10, 2009

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Hi,
Usually this problem oocurs due to the damageof thermocouple.But you say that you replace thermocouple. Check the efficiency of thermocouple by measuring the voltage on the wires coming back from the pilot. When you have the red switch depressed, check the voltage (should be about 200mV). If there's no voltage, then the fault is with thermocouple.

If not make sure pilot is clean, not a lazy flame, little or no yellow. If it does stay lit, the problem is probably in the "thermostat" circuit. The usual culprit is the pressure switch. If the pump isn't putting out enough
pressure, the heater won't fire. This is usually caused by the filter
needing back washing. You can jump the pressure switch momentarily
and if the heater fires, the problem is the switch. Either the filter needs
backwashing or a bad switch. Check for continuity with the pump running.
If the switch closes, the filter needs cleaning.

Hope this helps
Thanks
Smith.

Posted on Sep 10, 2009

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