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I removed the circuit board and before I replaced the relay, I tested it. I hooked my multimeter to J19 (Heater) and set it to audible continuity. I then applied 24V DC across pins #2 & #9 and the meter sounded, indicating that it did close. So, it’s not the relay. What can I check next...

I've ordered the part and will update once the new relay is installed. Thanks, Mike

How hard is it to replace the relay? I guess more specifically, how hard is it to remove the bad relay? I can solder in a new one.

I replaced the relay driver chips and nothing changed so the relay is the problem. I have a legacy control panel so I think I'll just upgrade it to an intellicenter. Thank you very much to all that replied. I could not have solved this without the amazing help! Best regards, Mike

I checked and J19 is not closing. All other relays seem to be working fine, water feature, cleaner, jets all turn on/off fine. Thanks, Mike

I checked continuity between the pins on J19 by measuring the resistance across the two screws used to secure the wires. It was 24 Mega Ohm when the spa was on. The same when the spa was off.

I jumped the firemans switch by removing the 2 wires on the easy touch control panel (J19) and twisting them together (twist.jpg attached). After power, the heater worked fine. Once the pump started I pressed the 'Pool On' and it started heating. I did not expect that. I powered everything...

I forgot to mention the fuse by the firemans switch is not blown. Thanks, Mike

The control panel on my Pentair Mastertemp400 heater has stopped getting power. I’ve read other post trying to fix this myself, but I’m at a point where I don’t know what to check next. Any guidance would be much appreciated. My system is about 15 years old and it’s a Pentair Easytouch control...