Alarm Z2 electric cassette E2 tripped overheat protection / pressure switch

What does 5247 mean?

The electric cassette for zone 2 has triggered its overheat protection or the system pressure switch has indicated low pressure (below 0.5 bar) in the air module. This prevents damage to the unit.

• Low system pressure or air trapped in the heating system.
• Clogged system filter or filter ball (SC1).
• Poor circulation within the heat transfer or heating system.
• Overheat protection or pressure switch (MC1) failure.
• Heat curve or hot water temperature settings are too high.

Click steps to track your progress.

1. 1

   Check the system pressure. If low, vent the heating system as per instructions in your manual and top up with water.

2. 2

   Clean the system filter/filter ball SC1. Refer to your manual for instructions on filter cleaning.

3. 3

   Review your heat curve and hot water temperature settings; adjust them if they are excessively high.

4. 4

   Ensure all adjuster valves and radiator thermostats are correctly set for good circulation.

5. 5

   If the alarm persists after these steps, contact a qualified technician for further inspection.