Monday, 16 August 2021

Pentair Master Temp 300 - Short Cycling

I recently purchased a home with a heated pool & spa. The heater worked fine for a few months, but it's been taking longer and longer to heat the spa. Recently took over 2 hours to go 10 degrees. (84 to 94).

When I put the pool in"spa" mode, the blower comes on, the amber heater blinks (calling for heat) and then the burner kicks in but only for 5 seconds(amber heat light goes steady), then it kicks out for 45 seconds and repeats this cycle forever. There are NO error codes on the front...

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