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Thread: Powerflex direct vent wont stay lit

  1. #1
    DIY Junior Member cannedham1's Avatar
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    Default Powerflex direct vent wont stay lit

    Hi all, I have a 4 year old powerflex direct vent water heater that wont stay lit. All the lights blink on the gas control valve and there is a continuous clicking from it. The only way to get it to light is to blow in the black tube on the blower connected to the diaphragm and then I hear the diaphragm click and it lights. I thought the diaphragm was the problem so I changed that. I need help please.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    By blowing through the black tube, you proved that the diaphragm switch was GOOD, not bad. It's doing its job as a safety interlock. There's a problem either with the fan, or exhaust venting - it's not moving the air properly, and creating enough pressure/vacuum to close the switch to keep it running. Could be a bird's nest, mouse, a separation in the exhaust venting, inoperative fan, crack in the tubing, etc.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Junior Member cannedham1's Avatar
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    Thank you jadnashua. I read the manual and it says that the error code for all the lights being lit it is the gas control valve. Im going to make sure there isnt anything obstructing the vent.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    The gas valve and the diaphragm switch are related, but not the same. That switch is in the interlock, safety circuit, and must be closed for things to work. Now, if it does close, and the gas valve doesn't open or the igniter fails to operate, that's a different issue. Could also be a flame sensor.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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