I have the spa set to 100 degrees. Prior to turning on the spa heater the water temperature is about 60 degrees. The heater warms the spa fine until the water temperature reaches about 94 degrees. At this point the heater flame shuts off for a couple minutes. The blower keeps running. The Service Heater lignt comes on. The heater flame comes back on for about 20-30 seconds. During this time the Service Heater light goes off. The flame then shuts off and the heater fan keeps blowing. The Service Heater light comes on. This keeps repeating itself for a dozen or so times until the spa reaches 100 degrees.
SOURCE: Heater cycles on and of, pool/spa does not reach desired temp
hello, It sounds like you may not be getting circulation thru the heater. Make sure the valves are open to allow water to pass thru the heating system. Some systems use a bypass on the heater so there is not a lot of wear on the coil system in the heater. If it is not circulating it will get too hot and the safety shut down will occure. If you are getting water circulating thru the heater, then the thermocouple or auto start igniter system is not working correctly. It is trying to start and can't then recycles. If the burners are igniting on the startup and then shutting back down you may have a bad control unit or thermal sensor unit. Since the unit is gas have a professional service it for you. Good Luck, RAC
SOURCE: Pool Heater Mis-reading Temp.
Your temp sensors are on the heater, a small tube that slides into the water manifold, usually on the left side. On the remote it will be in one of the pipes coming from the pump or the filter. If it is after the heater you should move it to between the filter and heater. It will be a tube that is in the pipe with a stanless steel clamp holding it in place.
To find out wich one it is you will need to remove the remote from the system by takeing the wires that go to it from the wireing inside the heater and wire nuting the wires in the heater together. If the heater runs normal then it is the sensor for the remote if not it is the sensor for the heater. Let me know how you do and if need be we can get a little more specfic for your system. good luck.
SOURCE: Pentair matertemp 400,000 BTU heater cycles on & off
My pentair matertemp 400,000 BTU natural gas heater cycles on and off before reaching desired temperature. I completely cleaned the DE filter and flow should not be an issue. When running the spa the pressure is 25. When running the cleaning system (polaris pop ups) the pressure is 30. Burner fires for 80 seconds then shuts off, reignites after 53 ceconds.Any tips on what might be the issue with the heater
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