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Thread: Pentair Master Temp 400 E05 Error code

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    Join Date
    Dec 2014
    San Diego

    Pentair Master Temp 400 E05 Error code

    When I turn on my heater the fan turns on within 5 sec, burner kicks in after 10 secs then stays on for 25 secs. All the time the temp indicates 56. Tried cycling three times over an hour with same results. Saw other posts, removed SFS (Stack Flu Sensor) cleaned it (nothing on it) and cleaned both male and female leads. cleaned it three times with same results also.
    Ran an OHM meter test get 4 ohms.
    Any other things I should look at?

    Wife is recuperating and would love to get spa running for her. Thanks.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Pentair Master Temp 400 E05 Error code

    The trouble shooting chart says to check the fuel supply, thermal regulator, correct orifices, etc. on an E05 error.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    In the Industry
    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Pentair Master Temp 400 E05 Error code

    Under the top there is the control board. On the back of the board there are LEDs that light up for the error, usually. Check and see which is on and you could find your problem. Most likely, even though you tested it, usually E05 is the stack flu sensor.

    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.

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