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Phase error
1. Measure incomming power with volt meter. Is terminal 120 Vac (L) approximately 120 Vac? Is 120 Vac (N) approximately 0 Vac?
Yes: -> 2.
No: Correct power supply to boiler.
2. Verify order of pins on J2. 4 pins order should be: empty, black ( or red), white, green. Measurevolts on pins of black wire and white wire. Is wiring/pins in right order? Does black/white wire pin have 0 Vac?
Yes: Replace control module.
No: Replace wire harness.
