Cause of error code No Display

1 No 120 VAC supplied to the unit
2 No voltage through the switch
3 Bad control module

Solution for error code No Display

1 - Check external line switch, fuse, or breaker. - Ensure On/Off switch is in the ON position. - Check 120 VAC through the On/Off switch. - Check wiring harness connection between external power and control module

2 - Replace switch.

3 - Replace control module