Alarm Z1 Electr.boost.heater E2 high li. saf. cut-out or press.reg. triggered — Electrical boost heater or pressure guard fault

What does 5246 mean?

This alarm indicates that either the electrical heater's overheating protector has triggered, or the heating system's pressure guard (MC1) has activated due to low system pressure (below 0.5 bar).

• Low system pressure or air in the heating system.
• Clogged filterball SC1 on the return pipe.
• Bad circulation in the heating carrier/heating system.
• Broken fuses (F1 or F50) or defective safety components (MC1, overheating protector).

Click steps to track your progress.

1. 1

   Check the heating system pressure and refill if it is below 0.5 bar. De-air the system if air is present.

2. 2

   Inspect and clean the filter ball SC1 located on the return pipe.

3. 3

   Check adjustment valves and thermostats in the heating system to ensure proper circulation. Contact a qualified technician if the alarm persists.