Hydraulic Indoor Unit LED2 (Green) 7 Flashes, LED1 (Red) 7 Flashes - Outdoor unit heat sink temperature thermistor error

What does LED2 7 Flashes, LED1 7 Flashes mean?

This indicates a problem with the thermistor measuring the temperature of the heat sink in the outdoor unit. The outdoor unit may also show '9 Flashes' for a heat sink thermistor error after pressing the ENTER switch.

• Faulty heat sink thermistor sensor.
• Loose or damaged wiring to the thermistor.
• Overheating of the heat sink due to poor ventilation or fan issues.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the heat pump for 30 seconds, then turn it back on.

2. 2

   Ensure the outdoor unit has proper ventilation and that its fan is operating freely.

3. 3

   If the error persists, use the 'Reset HP' function (Line 6711) in the control system.

4. 4

   Contact a qualified service technician to check or replace the thermistor.