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We have a pentair 250 NT DDTC heater. The fenwel control red light is flashing and according to the code it is air flow fault. To get the heater running, we jumped the air pressure switch and the heater worked. We changed the air pressure switch and the same thing happened. Do we have an air flow problem? Where can we check to find out where the air flows.

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  • oaiona May 09, 2010

    I'm not paying to be told to call Pentair. You're the expert. What do you recommend

  • oaiona May 11, 2010

    Your response was better than the other from the expert which was to call tech support. Thank you so much!

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There is tubing connected to the air pressure switch. Inspect for kinks, water logging, or cracks and correct as necessary.
Inspect your exhaust vent and your fresh air intakes. Clear any blockages.
Ensure you have air pressure at the exhaust termination point.
Inspect the motor and wheel for tightness and cleanliness...correct as necessary.
Check blower and blower housing gaskets, correct as necessary.

This is a good jumping off point. I look forward to hearing back from you with your findings. :-)

Also, here is a copy of an Operator's Manual that may be helpful to you.

Posted on May 09, 2010

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  • Level 3:

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I have a phone number for you to call, Call Pentair's Technical Service Department at: (800) 831-7133... GOOD LUCK..

Posted on May 09, 2010

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