heater issue

As my title says my pentair master temp 400 runs for about 30 seconds then cuts off with a service heater light. I have been attempting to trouble shoot for days but haven’t figured out the issue. There is no error light on the bottom of the board. I have replaced the thermal regulator twice. I...

Hi everyone, I have an issue with my pool heater Pentair minimax plus 400. I get POWER, TSTAT, AUX, PRESS lights on (green) and service light red. Heat light is off. On the back side all LEDs are green (PVALV, TFUSE, HITEMP). Pilot starts and burns, but the main burner does not start. Control...