Turbo Air TFS series ice cream display freezers (TFS-11F, TFS-20F, TFS-25F)
Glass-lid dipping and display freezers. The controller flashes Err in turn with a short code when something is wrong.
What it is: Display freezer controller
Turbo Air TFS series ice cream display freezers (TFS-11F, TFS-20F, TFS-25F) error codes
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Err ↔ oPn | Sensor open | Sensor broken or unplugged | Check the sensor. |
| Err ↔ HHH | Reading above the display range | Sensor or very high temperature | Clears once the reading is back in range. |
| Err ↔ LLL | Reading below the display range | Sensor | Clears once the reading is back in range. |
| Err ↔ LbA | Loop break: temperature has not moved 1 °C (2 °F) within the LbA time | Compressor not cooling | Check the compressor, then hold ▲+▼ for 3 s to clear. |
| COMP light flashing | Compressor held off by its start or restart delay | Normal protection | Wait. |
How to enter service / parameter mode
- Parameter group 1: from RUN, hold MD for 3 s. Press MD to step and save; hold MD 3 s to go back to RUN.
- Parameter group 2: from RUN, hold MD 3 s, then hold MD again for 5 s.
Parameter list
| Code | What it does | Range | Default / typical |
|---|---|---|---|
| HYS | Hysteresis | 0.5–5.0 °C (2–50 °F) | |
| dIn | Defrost interval (0 = manual only) | 0–24 h | 0 |
| dEt | Defrost time (0 = no defrost output) | 0–59 min | 0 |
| LbA | Loop-break watch time (0 = off) | 0–999 s | 0 |
| InB | Probe correction | -10.0 to 10.0 °C | 4 |
| LSu / HSu | Lowest / highest set point | by sensor range | -40.0 / 99.9 |
| SdL | Compressor start and restart delay | 0:10–9:59 min | 0:10 |
| ont | Minimum compressor run time | 0:10–5:00 min | 0:20 |
| drP | Drip time and fan delay after defrost | 0:00–5:59 min | 1:00 |
| FAn | Evaporator fan mode | EF1–EF5 | |
| CLE | Compressor cycle time while in error | 0–20 min | 0 |
| dUt | Compressor on share while in error | 0–100 % | 50 |
| Unt | Temperature unit | °F / °C | |
| LoC | Keypad lock | oFF, LC.1, LC.2, LC.3 | oFF |
Notes
- The InB default of 4 is as printed in the manual; check it against your unit.
- CLE and dUt let the compressor keep cycling on a timer if the sensor fails.
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: Turbo Air TFS series (HC) service manual, temperature control instruction. Always check the manual for your exact model and software version.
ServiceModes is not affiliated with Turbo Air or any other manufacturer. Written in our own words from the manufacturer's documentation.