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 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.