1. Check the wiring between the main
control board and the motor control
board.
Wiring is defective. Repair or replace wiring.
Wiring checks good. Replace the main
control first. If this does not repair the error,
replace the motor control board.
1. Contact the power supply company to
check incoming power frequency.
If the frequency is correct, replace main
control board.
1. Check the heating element resistance.
Element resistance should be
approximately 30 ohms.
If reading is correct, replace the main control
board.
1. Check the resistance of the tub NTC. Is
the NTC resistance approximately 4.8K
ohms.
No. Replace the heating element.
Yes. Check the wiring.