I got FISHER&PAYKEL MR850JHU problem,that error code showed E28 and E12.Who can tell me which board is bad?
E28-mains voltage measurement is uncalibrated; E12- temp. circuit calibration out of range. Check your service manual and go to service menu and try to calibrate first the humidifier and check your power PCB B/D, maybe just need recalibrations.
Micro-controller failure could be it?How to do the calibration?
You must have a service manual and follow the instructions for voltage calibration check.