Hydraulic Indoor Unit LED2 (Green) 4 Flashes, LED1 (Red) 2 Flashes - Hydraulic indoor unit heat exchanger thermistor error

What does LED2 4 Flashes, LED1 2 Flashes mean?

This error indicates a malfunction with the thermistor (temperature sensor) located in the hydraulic indoor unit's heat exchanger.

• Faulty thermistor sensor.
• Loose or damaged wiring to the thermistor.
• Sensor covered in debris or buildup.

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 safe to access, gently clean around the heat exchanger area for any obstructions.

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.