Structural Concepts HARMONY HMO5153R User Manual page 34

TROUBLESHOOTING (TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY) - PAGE 3 of 3
CONDITION
Case Lights Are Not
Working
Control Display Is
Flashing
Case Is Not Holding
Temperature
Condensing Unit Is
Not Operating
Check that light switch is in the on position.
Check that ALL of the light cords and plugs are properly connected. See
MAINTENANCE - LIGHT FIXTURES (LED LIGHT FIXTURES) section.
Service Technicians Only: Check voltage at LED drivers. If voltage is entering but
not exiting, LED driver may be faulty.
See your case's serial label for your model's specified settings. See SERIAL
LABEL LOCATION & INFORMATION LISTED / TECH INFO & SERVICE for label
location, etc.
If a large amount of warm product was added to the case, it will take time for the
temperature to adjust. Unit needs product to be pre-chilled.
Temperature changes during defrost mode but will return to normal. Fourth LED
will indicate defrost cycle in progress.
Check that case is not in sun or near a heat or air-conditioning vent. See
OVERVIEW AND WARNINGS section in manual for adverse conditions/spacing
issue parameters.
If case is located near front doors, temperature fluctuation can hinder unit's ability
to maintain temperature. See OVERVIEW AND WARNINGS section in manual for
adverse conditions/spacing issue parameters.
Check that magnetic air filter (attached to rear grille) has been cleaned. See
GENERAL CLEANING (TO BE PERFORMED BY STORE PERSONNEL) section
in operating manual for instructions.
Check that condenser coil has been cleaned.
Check air return grilles for obstructions.
Check sight glass for flashing and/or low charge.
Check Set Point Temperature; it may be adjusted too high.
Check that the power is turned on.
Determine if temperature controller settings are properly set. See your case's
serial label for your model's specified settings. See SERIAL LABEL LOCATION &
INFORMATION LISTED / TECH INFO & SERVICE section in manual for label lo-
cation, etc.
TROUBLESHOOTING
34