Set Appliance State:

Ensure external controls are calling for heat
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Activate the heating via the appliance display panel;
1. Press top right button once
2. Press + button until MAX temp 75°C is achieved
3. Press top right button once to confirm the temp value
4. Press top left button once to store the temp value
Does the boiler recognise the central heating demand?
Note:
This is indicated by a radiator symbol appearing in the display.