6 weeks back we had a problem where the heater would boot up (all LEDs would light momentarily, screen reads 888, then 213, then r13), then all the lights would go off. Normally it will go through that process and sit at the "Service System" or "Service Heater" until I would select POOL ON. I followed the troubleshooting flow chart from Pentair, everything seemed OK and when you get to the last step it says replace control board. I checked the board and could see a few spots where the coating was peeling off the copper traces. I cleaned it up, sealed it with black RTV, put heater back together and it has been working for 3 weeks no problem. Also replaced touchpad at same time.
About 10 days ago it started to backfire once when it turned on in the morning, but then fired up 5 seconds later and did not backfire the rest of the day. I check the ignitor and it was 133 Ohms, is supposed to be 40 - 80. Assume high resistance was preventing ceramic element from getting hot enough before gas built up. Ordered new one.
Heater was working today normally. New ignitor arrived today, shut off power to change it (new one reads 47 Ohms). Replaced ignitor, put back together turned on, and we're back to the issue from 6 weeks ago... boots up, then goes to no lights at all.
Anyone experience this before or have any ideas before I replace the board?
