High Limit Swtiich message
I am getting a high limit switch message and the heater is not operating. Was working 2 days ago, nothing has happen to the system that should have changed anything. What does High limit switch mean
Pool & Spa - Jandy - Laars Lt 250,000 Btu Heater
Answers & Comments
The high limit switch is one part of a safety loop circuit that must work before a heater can fire. It's purpose is to ensure tha tthe heater will shut off in the event of a thermostat failure or if the internal core gets too hot due to a lack of water flow. If the switch is failing, it needs replaced. There are 2 so you can replace both or make an attempt to determine which one is bad. It is best to replace the pair.