Hydraulic Indoor Unit LED2 (Green) 1 Flash, LED1 (Red) 1 Flash - Communication error between Hydraulic and Outdoor units

What does LED2 1 Flash, LED1 1 Flash mean?

This indicator signifies a communication problem between the indoor and outdoor heat pump units. It also corresponds to the outdoor unit displaying '1 Flash' for a serial forward transfer error after pressing the ENTER switch on the outdoor unit's electronic board.

• Loose communication wiring.
• Interference on the communication line.
• Faulty communication board or component in either unit.

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

   Check all communication cables between the indoor and outdoor units for secure connections.

3. 3

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

4. 4

   Contact a qualified service technician if the issue continues.