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Thread: Blower/Air Flow Trouble on a Pentair Mastertemp 200 Heater

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    Join Date
    Jun 2015
    Marlborough, MA

    Blower/Air Flow Trouble on a Pentair Mastertemp 200 Heater

    I moved into a house with an above ground pool last August. The pool had a heater attached, but was set up to bypass it by the previous owners. I assumed that meant there must be issues with the unit, but never tested it. A few weeks ago I reopened the pool after the winter, set the valves to run through the heater, and tried firing it up since the water was at a balmy 62 degrees. Everything seemed to work fine - blower came on, the the burner started and heated the pool for several hours. Got it up to about 75 degrees.

    However, since then, an issue has developed. When I turn on the heater, the blower tries to come on for about half a second and then shuts off. Then it will try starting again and shut off in a never-ending loop. The service heater light comes on each time it resets. I opened up the unit and observed one flash on the diagnostic light (which, according to the manual means "Air Flow Fault"). I also notice the AFS LED on the back of the control panel is on. I checked all the wiring connections and didn't see anything amiss.

    Anyone have any thoughts or suggestions on this? I'd love to save myself the cost of bringing out a technician. I'm a little handy, but not by any means adept at electrical or plumbing.

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    In the Industry

    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Blower/Air Flow Trouble on a Pentair Mastertemp 200 Heater

    Any chewed wires in side? Also check your air tubes on the blower motor.

    A unit that's been sitting a while and not used can become home to critters.
    Paul A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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