True Refrigerator Error Code HA: Dixell Maximum Temperature Alarm
HA on a True cabinet with a Dixell controller is the maximum temperature alarm. The cabinet air rose past its high limit, and the cabinet keeps running. Silence the alarm, keep the door closed for 30 minutes, check the food with a thermometer, and look for lint at the condenser.
Medium: product can warm if the cabinet does not recover, though it keeps running.
- Code
- HA
- Maker
- True
- Equipment
- Reach-in refrigerators
- Applies to
- Dixell controller
What does True error code HA mean?
HA is the warning that the cabinet air has risen past its high limit, for example on a T-23-HC or T-49-HC. The Dixell control watches the air probe, and when the reading stays above the limit it sounds and shows HA. The cabinet keeps running, so this is a warning about conditions rather than a shutdown. It often follows a long door opening, a hot load, a dirty condenser or a cooling problem that is building. If the cause was only a door open or a pan of hot food, the cabinet recovers and the alarm stops. If it comes back, heat is not leaving the box: a coil blocked with lint, an iced evaporator, a fan that has stopped, or an air probe reading the cabinet incorrectly. The next step is a thermometer in the food and a look at the condenser.
Affected models and control systems
True cabinets with a Dixell controller, such as the T-23-HC and T-49-HC.
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
- HA on the display
- Alarm tone
- Cabinet air warmer than normal
- Condenser area warm and dusty
Possible causes
Listed in True's documentation
- A dirty condenser coil limiting heat rejection
- Door gasket or door that is not sealing
- Evaporator coil iced up from a defrost problem
- Evaporator or condenser fan not moving air
- The air probe reading the cabinet incorrectly
Other likely causes — what usually sits behind error code HA on this control. A technician confirms which one it is before any part is replaced.
- A cabinet pushed against a wall so condenser air recirculates
- A defrost heater that no longer clears the coil, leaving ice that blocks airflow
- A kitchen that is hotter than the cabinet was rated for
Safe checks before calling for service
- Press any key to silence the alarm.
- Close the door fully and keep it closed for 30 minutes.
- Check product with a thermometer and move anything above safe temperature.
- Look at the condenser area for dust or lint, and keep the area around the cabinet clear.
- If HA returns, note the time and how long it takes to appear.
How a technician diagnoses error code HA
- Compare the display with a calibrated thermometer.
- Check door seal and fit.
- Inspect and clean the condenser coil and check the condenser fan.
- Check the evaporator for ice and the evaporator fan operation.
- Test the air probe against a reference.
- Check refrigeration performance once airflow and defrost are cleared.
- Fan and condenser work happens behind panels near live wiring.
- Weak cooling that remains after cleaning points to the sealed system, which needs gauges.
- Testing the probe needs a meter and a reference temperature.
How error code HA differs from similar codes
LA is the matching low temperature alarm on the same Dixell controller.
Technical reference
- Document
- Commercial Refrigeration General Control Guide TEC_TM_001 Rev C, Dixell p.96 Display Code Definitions
- Edition
- TEC_TM_001 | REV. C | EN, 09/3/2025, P#811072
- Models / control
- Dixell controller
- Section
- Electronic Control (with Display) - Display Code Definitions: Carel p. 74, Danfoss ERC/ETC p. 87, Dixell p. 96, LAE p. 110
- 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 True reach-in refrigerator error codes
Does HA mean the cabinet is broken?
Not necessarily. It warns that the air went above its limit, often after a long door opening or a hot load.
How long should I wait before worrying?
Keep the door shut for 30 minutes and watch the food temperature. If HA returns, call us.
Is HA the same as hi on an LAE control?
They are the same kind of alarm on different controls.
Need help with True error code HA?
A technician confirms the cause on site and gives you the price in writing before any work starts.