Set Appliance State:

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

Observation:

Confirm the boilers DSN number is set correctly.
This is diagnostic code "d.93".
The DSN number for the appliance can be found on the data badge and will be a number next to the word "Code" or "DSN"
Click here for how to enter and adjust diagnostic codes.