Safety: Unplug the cooler before working on it.

Steps:

1. Verify actual temperature: Place a separate thermometer inside the cooler to confirm the real temperature. If the display shows very high but the interior is cool, suspect a sensor issue.
2. Inspect thermistor wiring: Access the cabinet thermistor and its wiring harness. Look for spots where the insulation is damaged or pressed tightly against sharp metal edges.
3. Check connector for moisture: At the control board, disconnect the thermistor plug and inspect for condensation or corrosion. Dry thoroughly and clean if needed.
4. Measure resistance: With the thermistor disconnected, measure its resistance. A very low resistance (near 0 ohms) indicates a shorted sensor. Replace with a compatible NutriChef thermistor.
5. Re-test: After replacement, plug in the unit and verify that H1 clears and the temperature reading is reasonable.
6. Control board: If the sensor tests good but H1 persists, the analog input on the main control board may be defective and require replacement.

Display shows H1 and the cabinet temperature reading is extremely high or shows dashes; unit may run continuously.

Possible Causes