Question about Pentair Minimax CH Heater

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Heater fails to ignite after replacing; gas valve, electronic thermostat board, on/off switch, pilot millivolt. on a minimax ch 200 Pool heater.

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  • rloveland Jun 01, 2011

    I replaced the pilot valve and this solved the problem

    thanks

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  • 927 Answers

I have a pool heater, let me try to do this from memory.
For a gas heater to allow an ignition several things must occur and be proven.
There is a water pressure switch or flow switch to ensure water that will take the heat away from the heat exchanger is there in adequate flow. Find this switch and ensure that it is closing.
Next, a forced air fan starts. There is a switch that closed if air flow is adequate for the amount of gas in the flame. Is that switch closing?
The thermostat must be set higher than the incoming water temperature, is that circuit closed?
At this point, the electronic igniter sparks on my heater. Do you have a standing pilot light?
Next, the gas valve opens. Is the gas valve getting voltage?
If so, once the flame ignites, there is a thermocouple that must sense high flame temperature to allow the gas valve to stay open to heat the water.
There may be more and this may not be all for your heater, but if you have a multimeter, these are some things you can test.
Gary - let me know how you do.

Posted on May 30, 2011

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