Question about Pentair Minimax Ch 400,000 Btu Propane Pool Heater Millivolt Ignition

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Pool heater cycles off and on

Raypac versa, electronic .  cleaned filter and tryed by pass on pressure switch but problem persists.  Heater was neglected and full of leaves and rat droppings but that has been cleaned .
Paul Minimax 400 pool heater cycles on and off about every 30 seconds?
Is it the pressure switch or possibly the flow valve?
Somethig else

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Sounds like a limit switch, although it might mot be bad. If the filter is cleaned, and you have a good return from the pool jets, then you may have a problem with the flow valve in the heater. I would try to bypass the limit switches and see if that stops it, but it is dangerous. If you feel capable enough to try, only do so if there is a pressure relief valve on the header (does not come with heater, but if it was installed correctly then the installer would have to have put one on).

Posted on Apr 22, 2009

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