Hoping someone might have some suggestions to help me identify/troubleshoot my heater problem.
I have a Rheem/Raypak 206A heater that recently began mysteriously cycling off prematurely. It will fire up and run fine for up to about 3 minutes, sometimes much less, and then cycle off and not restart unless I manually turn the temperature knob down to almost zero, and then back up to the red zone. Then it will fire up again for a few minutes and shut off again. In the meantime my pool temp has fallen from the low 80s to the low 70s and still it won't stay running, leaving me with a very chilly pool.
I've backwashed the filter well, and verified that I'm getting good flow from the pump through the system. I presume a thermostat or similar part needs replacing, but cannot really tell from the manual the likely culprit.
Does anyone have any suggestion for most likely places to start troubleshooting this?
Thanks in advance.