Manitowoc E24 Error Code

What does Manitowoc E24 mean?

E24 indicates a fault with the T4 temperature sensor, which monitors the evaporator outlet refrigerant temperature. Together with T3, the T4 reading allows the control board to calculate the evaporator temperature differential — a key indicator of whether the refrigeration system is operating correctly. An open or shorted T4 thermistor prevents this calculation and triggers a shutdown.

Symptoms

• Machine shuts down with E24 in the event log.
• T4 sensor reading in diagnostics shows -22°F (open) or 475°F (shorted).
• Freeze cycle monitoring cannot confirm evaporator temperature delta.
• E07 or E08 may accompany E24 if both sensors are needed for flooding/starvation detection.

Common causes

• Failed T4 thermistor with open or shorted element.
• Mineral scale buildup on the T4 probe at the evaporator outlet.
• Loose or corroded T4 connector at the control board.
• Damaged wiring harness between T4 and the control board.
• Control board T4 input circuit failure.

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Diagnostic steps

1. Read T4 value in diagnostics

   Navigate to Menu → Services → Diagnostics → Temp Sensors. Record the T4 reading. An open thermistor reads -22°F; a shorted thermistor reads 475°F. Both readings five minutes into the freeze cycle confirm an active fault.

2. Clean the T4 probe and evaporator

   Run a Manitowoc clean-and-sanitize cycle. Soak the T4 probe in Manitowoc cleaning solution for 10 minutes. Scale on the probe can displace the thermistor from its sensing position.

3. Inspect T4 wiring and connector

   Power off and inspect the T4 connector at the control board for loose pins or corrosion. Trace the wiring to the evaporator outlet probe location and check for chafed or broken conductors.

4. Measure T4 thermistor resistance

   Disconnect T4 from the board and measure resistance with a digital multimeter. Compare against the service manual chart. Replace the thermistor if the value deviates more than 10% from spec at the measured temperature.

5. Replace T4 thermistor

   Install the Manitowoc-specified T4 thermistor for the model. Mount on the evaporator outlet line per the wiring diagram. Confirm the diagnostic reading returns to a valid temperature value.

When to call a professional

If thermistor and wiring replacement do not resolve E24, the control board T4 input is suspect. Factory-trained diagnosis is required before replacing the control board to confirm the fault origin.