Set Appliance State:

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

Observation:

Press the mode button until the radiator symbol flashes. Now use the +/- keys to adjust the set temperature to desired setting.
The display will revert back to normal after 10 seconds.
ADJUSTABLE
WILL NOT ADJUST