A.O. Smith CAWH 8-455-6 Installation, User And Service Manual page 70

Communication
error
Upper contactor
error
EN
Crystal frequency
error
EEPROM error
68
NA No communication between main
control board and UIM.
794 No communication between the
main control board and upper ele-
ment contactor and or elements.
0C1 Power supply frequency (Hz) is too
high or too low.
795 EEPROM failure
Contact a qualified installer or service
agency for repair. Refer to phone number
listed on the technical support label loca-
ted on the unit.
1. Turn off power at the breaker or dis-
connect switch and check for loose
connections at the contactors, main
board, and elements. If error per-
sists proceed to next step.
2. Replace contactor.
3. Replace main control board.
Check the power supply to the unit and
make sure the line frequency is between
56 Hz to 64 Hz.
Contact a qualified installer or service
agency for repair. Refer to phone number
listed on the technical support label loca-
ted on the unit.
Installation, Maintenance and Service part