My in-ground pool/spa combo heater is a pentair Minimax CH 200M. I'm having a problem where the heater shuts off at about 90 Degrees no matter which setting (pool mode or spa mode). Both knobs are adjusted and set to the max. Obviously 90 degrees is fine for a max temp for heating a pool, but a little low for our spa. I would really appreciate suggestions for a fix.
There are 2 high temp limit sensors
1. Pentair 471694 150 degree max temp
2. Pentair 471587 115 degree max temp
Both have not been replaced since I've received the heater. The heater obviously works and something is triggering it off around this temp. I'm assuming its either the thermostat or by chance both high limit sensors are faulty?
What do you all think?
Am I on the right track?