Dear Pool Gurus,
I have a MiniMax 400 heater (vintage 1995) which has been working fine since it's purchase/installation. Suddenly it is not performing. It will not 'heat' water passed 80 degrees. The unit has 4x indicator lights and 2x dials. Power light is on, Pressure light is on, Heat light is on, and Service light is off. Both Dials are set on Heat. When I turn the dials, I can hear the switch/ignition working. The MiniMax is indeed firing up, and heat is venting out of the top of the unit. But the water won't heat (passed 80).
Any ideas or tips on what to try are appreciated.
BTW, I did remove and inspect the "Minimax CH Flow Valve Assembly" (Part 19 in the diagram). Overall it looks fine. But oddly, inside this assembly was a deteriorated (maybe rubber) looking ball. Honestly I'm not sure if it is part of the assembly, or if this 'ball' worked it way into the valve by accident. Does anyone know it this 'ball' belongs in the Valve Assembly and/or can it be replaced if it is deteriorating?
Thanks in advance for any advise.