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Thread: Pentair mastertemp 400 heater issue

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    Pentair mastertemp 400 heater issue

    I received an E05 error on my Pentair Mastertemp 400 heater. It is about 8 years old and hasn't been used that often. At first heater would stay on about 12 seconds before shutting down. I replaced the stack flue sensor and now it runs about 30 seconds and shuts down. I've got it apart and the interior doesn't appear to be very dirty. Please help!!

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    Re: Pentair mastertemp 400 heater issue

    I just attempted to check the thermal regulator, however with much difficulty all that came out was the spring. Please help?

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    Re: Pentair mastertemp 400 heater issue

    Quote Originally Posted by Fkohring View Post
    I just attempted to check the thermal regulator, however with much difficulty all that came out was the spring. Please help?
    That is a symptom of a broken manifold by-pass valve P/N 77707-0001. P/N 460923 would be for the ASME old heater design prior to 10/2012.

    NOT the end of the heaters' life, but a project that you may, or may not want to tackle on your own...
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak (Rheem, Rudd), Polaris,
    and Paramount pool cleaning systems.

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    Re: Pentair mastertemp 400 heater issue

    Pool clown will there be a diagram or instructions with the by-pass valve and gasket kit to show how it fits back in the manifold?

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    Re: Pentair mastertemp 400 heater issue

    Please note a discrepancy with the part numbers. Hope you had not ordered yet. I dont know if instructions come with that part. I have not noticed any in the past, but i could be wrong.

    More info here.

    https://www.troublefreepool.com/thre...l=1#post343211
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak (Rheem, Rudd), Polaris,
    and Paramount pool cleaning systems.

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    Re: Pentair mastertemp 400 heater issue

    When you take the unit apart, it will be pretty obvious as how it goes back together. You can easily find directions online just like Pool Clown showed you.

    Make sure to get a new thermal regulator with clip. Also replace the orings and the gasket.

    Good luck.
    Paul
    Gastek Pool & Gas Services If you would like to provide a review of the help I provided, please use the following link to leave a review. Gastek Google review,
    Check out some videos on my YouTube channel - Gastekservices on YouTube

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