Inkbird ITC-308
Plug-in dual-outlet controller (10 A total) that powers a heating outlet below the set point and a cooling outlet above it, with separate differentials.
What it is: Plug-in heat/cool thermostat. The ITC-308-WIFI uses the same menu codes but is set up mainly through the app and has different defaults, so check its own manual.
Key combo: Hold SET for 3 s to open the menu; hold SET 3 s again to save.
Inkbird ITC-308 error codes
| Code | Meaning | Likely cause | How to reset |
|---|---|---|---|
| Er | Probe fault | Probe shorted or open | All outputs off and buzzer. Any key mutes it. Returns to normal once the probe is fixed. |
| HL | Reading above range | Above 120 °C / 248 °F | All outputs off and buzzer. Any key mutes. Clears when the reading is back in range. |
| (beeping, no code) | High or low alarm | At or above AH, or at or below AL | Any key mutes. Stops once back between AL and AH. |
| HD / CD stuck on screen | Controller hung | Back screws too tight, or the program stopped responding | Loosen the back screws slightly, then run the power-up test below and power-cycle normally. |
How to enter service / parameter mode
- Hold SET for more than 3 seconds. The indicator lights and TS shows.
- Tap SET to move through TS, HD, CD, AH, AL, PT, CA, CF.
Parameter list
| Code | What it does | Range | Default / typical |
|---|---|---|---|
| TS | Set point | −50 to 120 °C (−58 to 248 °F) | 25 °C / 77 °F |
| HD | Heating differential: heat comes on at TS − HD | 0.3 to 15 °C (1 to 30 °F) | 2.0 °C / 3 °F |
| CD | Cooling differential: cooling comes on at TS + CD | 0.3 to 15 °C (1 to 30 °F) | 2.0 °C / 3 °F |
| AH | High alarm | −50 to 120 °C | 120 °C / 248 °F |
| AL | Low alarm | −50 to 120 °C | −40 °C / −40 °F |
| PT | Compressor restart delay | 0 to 10 min | 0 |
| CA | Probe offset | −15 to +15 °C (°F) | 0 |
| CF | Display units | C / F | C (US units: F) |
How to change and save a setting
- Adjust the shown value with up / down.
- Hold SET for 3 seconds to save. If you leave it 10 seconds without a key press it exits WITHOUT saving.
Other useful key presses
| Task | How |
|---|---|
| Check HD / CD | Tap up for HD, down for CD |
| Outlet test | Unplug, hold SET, plug in, release SET. Tap up or down once to switch an outlet and its light on; this proves the relay. Unplug and plug in again without SET to return to normal |
Notes
- Both heat and cool stop when the reading gets back to TS.
- Changing CF resets every setting to factory defaults.
- The cooling light flashing means the PT restart delay is counting down.
- 10 A / 1200 W total at 120 V across both outlets.
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: Inkbird ITC-308 user manual (V7.0). Always check the manual for your exact model and software version.
ServiceModes is not affiliated with Inkbird or any other manufacturer. Written in our own words from the manufacturer's documentation.