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Commercial Refrigerator Error Codes (All Brands)
Quick Answer
Complete list of commercial refrigerator and freezer error codes by brand with explanations and troubleshooting tips.
Common Fitment Questions
What should I verify before ordering a refrigeration replacement part?
Verify the model number, serial plate, old part number, dimensions, mounting style, voltage when applicable, and photos of the installed part before ordering.
Can appearance alone confirm compatibility?
No. Commercial refrigeration parts can look similar but differ by dimensions, voltage, connector, mounting pattern, handedness, profile, or equipment application.
What related parts should I inspect during repair?
Inspect nearby wear parts such as gaskets, hinges, latches, heaters, handles, fan blades, sensors, controls, wiring, and mounting hardware depending on the repair symptom.
Commercial Refrigerator Error Codes (All Brands)
Commercial refrigeration systems use error and alarm codes to indicate system faults. Understanding these codes helps technicians diagnose issues faster and avoid unnecessary downtime.
This reference guide lists common error codes across major commercial refrigerator and freezer brands.
Hoshizaki Error Codes
- E01: Water supply error
- E02: Drain error
- E03: Freeze cycle error
- E04: Harvest error
- E05: High temperature error
Manitowoc Error Codes
- 1 Flash: No water detected
- 2 Flashes: Harvest problem
- 3 Flashes: Bin switch fault
- 4 Flashes: High pressure
True Refrigeration Error Codes
- AL: Temperature alarm
- HI: High temperature
- LO: Low temperature
- EF: Evaporator fan error
Hussmann Error Codes
- F1: Sensor failure
- F2: Defrost error
- F3: Fan motor fault
Zero Zone / Kolpak / Thermo-Kool
- Temp Alarm: Temperature deviation
- Defrost Error: Heater or sensor issue
What To Do When an Error Code Appears
- Record the exact code
- Power cycle the unit
- Inspect water and airflow
- Check sensors and wiring
- Replace faulty components
When to Replace Parts
- Repeated alarms → replace sensors
- Temperature errors → inspect fans
- Communication errors → replace control boards
Frequently Asked Questions
Are error codes standardized across brands?
No. Each manufacturer uses different codes.
Can error codes be ignored?
No. Ignoring codes can cause major system damage.
Should I call a technician?
For electrical and refrigerant issues, yes.