Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Observation:

Confirm that the EEPROM key is present, fitted correctly on main PCB and is the correct version for the appliance.
For appliances with a grey silencer:
E-COMBI 24 & E-SYSTEM 24 - Use EEPROM marked '24KW'
E-COMBI 30 & E-SYSTEM 30 - Use EEPROM marked '30KW'
E-COMBI 38 - Use EEPROM marked '38KW'