Display shows “d1” and unit will not start heating.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Open or shorted defrost sensor, Incorrect sensor placement, Faulty control board defrost circuit

Safety first: Disconnect power before accessing sensors.

Locate defrost sensor: Usually attached to the evaporator coil or refrigerant line leaving the coil.
Inspect and reseat: Ensure the sensor is securely clipped and making good thermal contact. Reseat the connector at the control board.
Measure resistance: Compare to the Heat Siphon spec chart. Replace if readings are abnormal.
Board evaluation: If a new sensor does not clear d1, the control board may need replacement by a qualified technician.

Medium 3/5

Defrost Sensor

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