I noticed my 155Max controls all out (no display or leds on) I've had a lot of electrical storms roll through and I fear the 155's controller card has taken the hit. There is little troubleshooting I can find on the net. So reaching out to the community to seek help.
Symptoms:
Main and secondary controllers not powered.
Unplug unit and repower does not cycle fan through self-test
Only partly drives damper close, will not cycle open and close
Controller board has GEN0 0412-336-0xx01C xx= possible 35 Partly obscured by coating material.
Model is 155Max SN NECA 06121330123
Voltage measured at terminal Block Part # 99-101 on R, Y, G all ~27v
155Max was fully functional until recently.
Any guidance with troubleshooting steps would be appreciated before I start replacing parts.