Set Appliance State:

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

Observation:

Enter the status code display mode.
(Press the top 2 buttons simultaneously then release)
Status codes S07, S53, S54, S96 or S98 indicate an issue with the temperature spread measured by the thermistors.
Is one of the status codes listed above shown?
Note:
To exit the status code mode Press      (top left button) once.