Set Appliance State:

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

This appliance can be set to indicate when maintenance is required, if the maintenance interval has expired then SEr will be shown in the display.
Navigate to diagnostic code d.84 (maintenance interval) and view the value.
Click HERE for guidance on how to access / adjust the diagnostic codes.
Is d.84 showing 0 indicating the maintenance interval has expired?