Alarm Z1 Flow and return between indoor and outdoor unit mixed up — Hoses incorrectly connected

What does 5446 mean?

This alarm indicates that the hoses for flow and return between the Heat Pump and the indoor unit have been incorrectly connected, causing abnormal temperature and pressure readings.

• Hoses for flow and return between the Heat Pump and indoor unit have been mixed up.
• Defective sensor TC3 or TC0.

Click steps to track your progress.

1. 1

   Visually inspect the hose connections between the Heat Pump and the indoor unit to ensure flow and return are correctly installed.

2. 2

   Check the placement of sensors TC3 and TC0 to ensure they are on the correct pipes.

3. 3

   If the alarm persists, contact a qualified technician to compare displayed temperatures with an external thermometer and replace any faulty sensors.