Manitowoc E22 Error Code

What does Manitowoc E22 mean?

E22 indicates a fault with the T2 temperature sensor, which monitors the compressor discharge line. During harvest, the control monitors T2 to confirm discharge temperature stays above 150°F — a signal that hot gas is flowing correctly through the evaporator to release the ice slab. An open or shorted T2 thermistor prevents the control from verifying harvest conditions and triggers a shutdown.

Symptoms

• Machine shuts down with E22 in the event log.
• T2 sensor reading in diagnostics shows -22°F (open) or 475°F (shorted).
• Harvest cycle may terminate abnormally or E02 may accompany E22.
• Wiring or connector to T2 sensor on the discharge line is damaged.

Common causes

• Failed T2 thermistor with open or shorted resistance.
• Loose or corroded T2 connector at the control board.
• Damaged wiring harness to the T2 sensor on the discharge line.
• Thermistor displaced from its mounting position on the discharge line.
• Control board T2 input circuit failure.

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Diagnostic steps

1. Read T2 value in diagnostics

   Navigate to Menu → Services → Diagnostics → Temp Sensors and record the T2 reading. Values of -22°F or 475°F confirm open or short circuit faults in the thermistor or wiring.

2. Inspect T2 wiring and connector

   Power off the machine and inspect the T2 connector at the control board. Clean any corrosion from the pins, reseat the connector firmly, and check the wiring harness for damage along its run to the discharge line.

3. Measure T2 thermistor resistance

   Disconnect T2 from the board and measure resistance with a digital multimeter. Compare against the temperature/resistance table in the service manual. More than 10% deviation from spec confirms thermistor failure.

4. Verify thermistor mounting on discharge line

   Confirm T2 is clamped on the compressor discharge line in the correct position per the wiring diagram. A displaced thermistor reads ambient temperature, not discharge temperature.

5. Replace T2 thermistor

   If resistance is out of spec or the thermistor is physically damaged, replace it with the Manitowoc-specified part. Mount and insulate per the installation diagram.

When to call a professional

If thermistor replacement does not clear E22 and wiring tests clean, the control board T2 input circuit is suspect. Control board diagnosis requires a factory-trained technician to avoid replacing the wrong component.