Question about Sta Rite Sta-Rite Max-E-Therm High Effiency - Propane Heater - 333,000 BTU

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Sta-rite pool heater SR333LP

I changed the thermostat on this last year. about 6 months later when the heater is turned on for the spa and temp set say at 100 (water temp about 85) the flame lights up and stays on for a short time then goes out. a few minutes later it comes back on. the heating process takes very long. occasionally it stays off until I turn it off complete and then turn it back on again. what do you think is wrong? would this possibly be the thermostat again? thank you, Mark Severino Arizona

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  • Iain J May 07, 2009

    Same Problem.

    Board fault shows as HLS - replaced HLS but same problem. Thermal governor also changed. HLS Sersor does get hot, but there is adequate flow of water through the system - could it be the bypass valve ?

  • Anonymous Mar 21, 2014

    When I turn the electric pool heater on, the fan starts and then goes off in about five minutes. Then it cycles back on but the heat doesn't seem to change.

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This heater has a thermal regulator and a high limit that could be the problems. If it were a high limit that was bad, the display would show the error when the heater goes off. In the absence of an error, one would look to the regulator. A bad regulator would cause the water flow to bypass the exchanger and cause a slow heat. The part is easily replaced and runs about $90. It sort of looks like a car thermostat and also has a spring. It is accessed by removing the large black plug near the plumbing inlet/outlet.

Posted on Dec 21, 2008

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