Error 72 (7 Green, 2 Red Flashes) — Compressor thermistor error

What does 72 mean?

The hydraulic unit's green LED flashes seven times and the red LED flashes twice. This indicates a problem with the thermistor that monitors the compressor's temperature.

• Faulty compressor thermistor.
• Loose or damaged wiring to the thermistor.
• Compressor overheating due to other system issues (e.g., low refrigerant, blocked airflow).

Click steps to track your progress.

1. 1

   Power cycle the heat pump system by turning off the main breaker for 60 seconds and then restoring power.

2. 2

   Clear any obstructions around the outdoor unit to ensure adequate airflow for cooling the compressor.

3. 3

   Check the ambient temperature; extremely high temperatures can contribute to compressor overheating.

4. 4

   If the error persists, contact a qualified technician, as this could indicate a faulty thermistor or an underlying compressor issue.