Manitowoc Ice Machine Error Code E22: T2 Temperature Sensor
E22 means the T2 thermistor on a Manitowoc Indigo ice machine reads outside its valid range, so the board cannot use it. See whether the machine keeps making normal ice, keep spray away from the compressor area, and do not disturb the wiring. A technician can test the sensor with a meter.
Low: ice is still made, but one protective check is no longer working.
- Code
- E22
- Maker
- Manitowoc
- Equipment
- Ice machines
- Applies to
- Indigo series (non-NXT) control board, Event Log (Service menu > Event Log > View ELog)
What does Manitowoc error code E22 mean?
E22 in the Event Log of Manitowoc Indigo ice machines without the NXT display refers to the T2 thermistor. Its reading is outside the valid range, so the board cannot use it. The board compares this sensor with another discharge temperature to spot flooding, so losing T2 weakens protection on the refrigeration side even though ice may still be made. Staff may notice nothing yet. The point of the entry is that a safeguard has gone quiet: the machine is no longer able to check itself for the flooding condition that E09 and E10 describe. The display text for the entry is E22. Typical reasons are a loose plug on the control board, a corroded terminal, a sensor that has come off its mounting on the line, or a thermistor that has failed open or shorted. A technician tests the sensor with a meter rather than replacing it by guess.
Affected models and control systems
Manitowoc Indigo series cubers with the non-NXT control board (Service menu > Event Log > View ELog). E22 is the T2 sensor entry; T1, T3 and T4 have their own numbers.
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
- Usually no change in ice
- Flooding checks quietly disabled
- The E22 line in the Event Log
Possible causes
Listed in Manitowoc's documentation
- A loose T2 thermistor plug on the Indigo board
- A corroded terminal on the T2 sensor wire
- A T2 sensor that has come off its mounting on the line
- A shorted or open T2 thermistor
Other likely causes — what usually sits behind error code E22 on this control. A technician confirms which one it is before any part is replaced.
- Moisture on the terminal from wash-down spray reaching the compressor area
- A sensor strap that loosened with vibration over time
- A wire insulation crack near a hot discharge pipe
Safe checks before calling for service
- See whether the machine keeps producing ice and whether slabs look normal.
- Keep spray and water away from the compressor area.
- Do not disturb the wiring.
- Call us so a technician can test the sensor with a meter.
How a technician diagnoses error code E22
- Read the Event Log for E22 and check for related entries.
- Inspect the T2 plug at the control board and the terminal ends.
- Check that the sensor is seated on the line and insulated.
- Measure thermistor resistance against the temperature chart.
- Replace the sensor or lead only after the meter test.
- The discharge line gets hot enough to burn, and the sensor is clamped to it.
- Meter readings must be compared with a chart for the line temperature.
- A flooded-evaporator check depends on this sensor, so it must be sound before the machine is left running.
How error code E22 differs from similar codes
E22 matters because the flooding checks behind E09 and E10 compare this sensor with another discharge reading.
Technical reference
- Document
- Indigo Series Technician's Handbook 000014794 5/17, "Event Log" p.87-91
- Maker documentation
- Manitowoc owner support
- Edition
- Part Number 000014794 5/17
- Models / control
- Indigo series (non-NXT) control board, Event Log (Service menu > Event Log > View ELog)
- Section
- Event Log: code list p. 87, Event Log Detail table pp. 88-91 (Service menu > Event Log)
- 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 Manitowoc ice machine error codes
Can I keep running the machine with E22?
Yes, it will keep making ice, but a protection that watches for flooding is weakened until the sensor is fixed.
Will E22 clear itself?
Not if the sensor or wire is damaged. A loose plug may behave intermittently.
Is E22 the same as E21?
No. E21 is T1 and E22 is T2, two different thermistors on the discharge side.
Need help with Manitowoc error code E22?
A technician confirms the cause on site and gives you the price in writing before any work starts.