service heater

My heater shuts off every once in a while (recently daily) with a Service Heater light. I turn the heater off and back on and it then appears fine. When I checked the back of the circuit board, none of the indicator lights were on, except for a red LED on the bottom right next to R15. There is...

Hello, I have a Pentair Mastertemp 400 (almost 6 years old). I have been getting as service heater light (solid red light on the Fenwal Ignition Controller module - Control Fault). The heater will run normally about 50% of the time that we use it. On the occasions that the service heater light...

It starts fine, runs for 2-3 minutes then triggers the Service Heater. I took the front panel off to see the LEDs on the board and I see nothing that is on. What would tigger the Service light if no LEDs are triggered? If I turn it off and turn it back on, it will run again for the 2-3...