5369 - Bosch Heat Pump Z2 low overheating alarm

What does 5369 mean?

This alarm indicates that Bosch Heat Pump zone 2 is experiencing conditions of low overheating. It triggers after 3 warnings in 3 hours, or if a warning is active for 30 minutes.

• Poor or loss of circulation in the heat transfer or heating system.
• Dirt in the system filter or filter ball SC1.
• Air present in the heat transfer or heating system.
• Too low temperature in the heating system due to closed thermostats.

Click steps to track your progress.

1. 1

   Check and adjust adjuster valves and radiator thermostats to ensure proper circulation throughout the heating system.

2. 2

   Clean the system filter or filter ball SC1 if it appears dirty or blocked.

3. 3

   Vent the heating system as per the instructions in your manual and top up the water level in the heating system.

4. 4

   Open more thermostats on the heating system to allow for increased temperature and flow.