Pentair Heater “service light on”

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If you are getting a "Service Heater" LED, then you will have an error LED on the control board or the Fenwal of the 5 button heaters. Check the diagnostic LEDs or the Fenwal box LED for blinks.

Diagnostic LEDs are on the back of the older 5 button non-connected Pentair MasterTemp heater board. The 6 button RS-485 Connected Heater displays the diagnostics on the heater display or IntelliCenter display.


Pentair_MasterTemp_Diagnostic_LEDs.jpg