My Spa / Pool Heater just began to shut off at 97 degrees. SPA temp is set to to 102 degrees. Is it the High Limit switch malfunctioning or is it the Temperature sensor? It is a Teledyne Laars Lite 2 400 BTU. Replaced a leaking pressure switch 2 years ago. That does not seem to be the cause. Works fine up to 97 degrees and shuts itself off.
I intend to relace parts.. which should I try first? any suggestions would be appreciated.