Hydraulic Indoor Unit LED2 (Green) 7 Flashes, LED1 (Red) 8 Flashes - Expansion valve thermistor error

What does LED2 7 Flashes, LED1 8 Flashes mean?

This indicates a problem with the thermistor associated with the expansion valve in the outdoor unit. The outdoor unit may also show '6 Flashes' for an expansion valve thermistor error after pressing the ENTER switch.

• Faulty expansion valve thermistor sensor.
• Loose or damaged wiring to the thermistor.
• Malfunction of the expansion valve itself.

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

   If the outdoor unit ERROR LED is blinking, press the ENTER switch to confirm the specific '6 Flashes' error code.

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 inspect the expansion valve and its thermistor.