I have a Pentair minimax NT low NOX heater that stopped working. The front panel leds will alternate between:
- just the power, pressure and pool leds lit with a - in the temp display
- service led and all the leds on the right will come on with an 8 . in the temp display.
Does this sound like the DDTC controller card has gone bad? I inspcted the cqrd and I don't see any noticeable problems (components, solder joints, etc.).