Alarm Z1 Electr.boost.heater E2 high li. saf. cut-out or press.reg. triggered

What does 5246 mean?

The electrical heater's overheating protector or the heating system's pressure guard (MC1) has been triggered. This can be due to low pressure (<0.5 bar) or overheating.

• Low system pressure
• Air in the heating system
• Clogged filterball SC1
• Bad circulation in heating system
• Blown fuse F1 or F50
• Defective system pressure guard MC1
• Defective overheating protector
• Missing PWM signal or 230V supply for circulation pump PC0
• Defective circulation pump
• Jammed contactor for electrical heater

Click steps to track your progress.

1. 1

   De-air the heating system and refill if necessary.

2. 2

   Clean the filter ball SC1 on the return pipe.

3. 3

   Check heating system adjustment valves and thermostats.

4. 4

   Replace fuse F1 or F50 if blown.

5. 5

   Verify the breaking temperature of the overheating protector (96°C).

6. 6

   Ensure 230V supply to the circulation pump PC0 and check the PWM signal.