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Thread: MiniMax 400 - Wont fire unless thermostat is all the way up

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    MiniMax 400 - Wont fire unless thermostat is all the way up

    It was working earlier this season. I noticed the water had cooled off over the weekend. I checked and the heater won't fire unless the thermostat knob is all the way full heat. It will run "forever" when at this setting--- but I'm not trying to boil mudbugs !

    The knob usually sits at about 1 o'clock or so and ran just fine.



    ==How would one check the the thermostat probe ? Does the probe generate a voltage or resistance as the temp changes ?

    ==The thermostat probe looks like its glued into the manifold. How would one replace the probe ?
    - Reji

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    In the Industry

    Join Date
    Jul 2008
    Location
    Pittsburgh, PA
    Posts
    118

    Re: MiniMax 400 - Wont fire unless thermostat is all the way up

    I believe that minimax heaters have a manual thermostat which is permenantly connected to the probe. Someone double check me, but you will have to replace both. The probe is usually siliconed into the thermal well. These do determine temperature through a resistance reading but I have never found a good way to check this. You really just have to isolate that that is the problem by jumping it and if so replace it.
    Matthew
    Involved in the pool and spa industry
    Pittsburgh, PA

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