Warning Z1 Restr. in flow rate btw. outdoor and ind. unit (check strainer) — Restricted flow rate

What does 5252 mean?

This warning appears when the heat carrier temperature difference (delta) exceeds 13K in heating mode or 7K in cooling mode. This suggests restricted flow or poor circulation within the heating system.

• Bad circulation in the heating carrier/heating system.

Click steps to track your progress.

1. 1

   Check all adjustment valves and thermostats within your heating system to ensure they are open and functioning correctly.

2. 2

   Inspect the system for any potential blockages or closed valves that could restrict flow.

3. 3

   Ensure the system is properly filled and de-aired to support good circulation.