Hoshizaki Refrigerator Error Code Hi: High Temperature Alarm
Hi on a Hoshizaki Steelheart A-Series appliance means the refrigerator cabinet has been above 57F (13.9C), or the freezer above 26F (-3.3C), for more than 2 hours. Close the doors and clean the air filter and condenser. If the temperature does not return, call a qualified service technician.
High: the cabinet has stayed above its limit for 2 hours and stored food is at risk.
- Code
- Hi
- Maker
- Hoshizaki
- Equipment
- Reach-in refrigerators
- Applies to
- Steelheart A-Series upright controller
What does Hoshizaki error code Hi mean?
Hi is a high temperature alarm built around time. The controller watches the cabinet, and only when the temperature has stayed above the limit for more than 2 hours does it raise Hi. The limits are 57F (13.9C) for a refrigerator and 26F (-3.3C) for a freezer. The 2-hour delay filters out door openings and fresh loading, so a Hi alarm means the cabinet failed to recover. The alarm resets automatically when the temperature returns to normal, and the up button silences it and clears Hi. The manual's first actions are practical: close the doors, and clean the air filter and condenser, since a clogged condenser cannot reject heat. If the temperature does not come back, the manual says to call a qualified service technician. Food in the cabinet should be checked against food safety limits while the alarm is active.
Affected models and control systems
Steelheart Upright A-Series: R1A and R2A refrigerators and F1A and F2A freezers, with the DT2A also named in the manual.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Hi on the control display
- Alarm beeping
- Warm cabinet air
- Compressor running for long periods
Possible causes
Likely causes — what usually sits behind error code Hi on this control. A technician confirms which one it is before any part is replaced.
- Doors left open or not sealing
- Dirty air filter or condenser that blocks heat removal
- A door gasket that has worn and leaks warm air
- A large load of warm product added at once
- A condenser fan that has slowed or stopped
- A cooling system that has lost capacity
Safe checks before calling for service
- Close all doors firmly and check that nothing holds one open.
- Clean the air filter and wipe dust from the condenser, as the manual says.
- Check with a separate thermometer and move food to another unit if it stays warm.
- Press the up button to silence the alarm, and note how long Hi has been showing.
How a technician diagnoses error code Hi
- Confirm the real cabinet temperature with a calibrated thermometer.
- Check door seals and the room temperature.
- Inspect the condenser and fan for dirt and rotation.
- Check compressor operation and the cabinet sensor.
- Look at the refrigeration circuit only after airflow and the sensor are shown to be good.
- Condenser fan and compressor checks involve live line voltage behind panels.
- The refrigerant circuit needs licensed handling.
- A sensor reading high must be told apart from a real warm cabinet with a thermometer and meter.
How error code Hi differs from similar codes
Hi is the warm-side alarm; Lo is the cold-side alarm. Both wait 2 hours and reset on their own.
Technical reference
- Maker documentation
- Hoshizaki owner support
- Edition
- Number 73237, issued 2-25-2019, revised 3-24-2022
- Models / control
- Steelheart A-Series upright controller
- Section
- Alarm Safeties, Alarm Signals table, pp. 30-31
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Hoshizaki reach-in refrigerator error codes
How long before Hi appears?
The cabinet must stay above the limit for more than 2 hours, according to the manual.
Will it reset by itself?
Yes, it resets automatically once the temperature returns to normal. The up button also silences it and clears Hi.
What are the limits?
57F (13.9C) for the refrigerator and 26F (-3.3C) for the freezer.
Need help with Hoshizaki error code Hi?
A technician confirms the cause on site and gives you the price in writing before any work starts.