True Reach-in and undercounter electronic controls (Carel, Danfoss ERC / ETC, LAE)
True fits Carel, Danfoss and LAE controllers. All of them show short codes for defrost, door and temperature alarms and probe faults.
What it is: Refrigerator / freezer controller. Check the maker’s name on the control (or in the True control guide) to pick the right rows.
True Reach-in and undercounter electronic controls (Carel, Danfoss ERC / ETC, LAE) error codes
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Carel: E0 / E1 / E2 | Probe 1 (air) / 2 (defrost) / 3 fault | Probe open, shorted or unplugged | Check the probe (white = air, white/blue = coil). |
| Carel: Ed | Defrost ended on maximum time | Heater or coil probe | Check the defrost. |
| Carel: HI / LO | High / low temperature alarm | Door, load, refrigeration | Clears when back in range. |
| Carel: dOr | Door open | ||
| Danfoss ERC: E01–E04 | Sensor S1–S4 fault | Sensor | Check the sensor. |
| Danfoss ERC: Con | Condenser alarm | Dirty condenser or fan | Clean the condenser. |
| Danfoss ERC: LEA | Refrigerant leak alarm | Leak | Find and repair the leak. |
| Danfoss ERC: EoC | Control and display not talking | Cable | Check the display cable. |
| Danfoss ERC: non / SYn | Display sensor not set up / display not compatible | Wrong display or setting | Fit the right display. |
| Danfoss ERC: uHi / uLi (uLo) | High / low supply voltage | Supply | Check the supply. |
| Danfoss ETC: E1 / E2 | Sensor 1 / 2 defect | Sensor | Check the sensor. |
| Danfoss ETC: E4 / E5 / E6 | Compressor / heater / set-knob (pot) fault | Part failed | Check that part. |
| Danfoss ETC: E13 | Communication error | Cable | Check wiring. |
| Danfoss ETC: Ulo / UHi | Low / high supply voltage | Supply | Check the supply. |
| LAE: E1 / E2 / E3 | Probe T1 (air) / T2 (coil) / T3 (display) failure | Probe | Check the probe. |
| LAE: hi / Lo / do | High / low temperature / door open | ||
| LAE: thi / tLo | Highest / lowest recorded air temperature | Information | |
| LAE: Loc | Keypad locked |
Notes
- dF / deF / dEF on any of these just means a defrost is running.
For licensed technicians only. This equipment can involve mains voltage, high-voltage microwave circuits, gas and refrigerant. Isolate power (and gas) before opening panels, follow the manufacturer's manual and your local licensing rules (for example ARC refrigerant handling and electrical or gas licences). Wrong settings can spoil food or damage equipment. Check every value on the unit in front of you before changing it.
Based on: True commercial refrigeration general control guide TEC_TM_001 Rev C (2025). Always check the manual for your exact model and software version.
ServiceModes is not affiliated with True or any other manufacturer. Written in our own words from the manufacturer's documentation.