Set Appliance State:

Gas Off
Isolate Mains Power to appliance as per TOPs P4
CH Demand
Attach U gauge to inlet pressure test point
Ensure no other gas appliances are in operation
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the appliance to run in CH and the burner to
ignite and establish. Monitor the U gauge.
1. Press the top right button (rad) once, the target flow
temp will be on the display.
2. Press the - button and reduce the temp to absolute
minimum, heating off will be displayed.
3. Press ✓ followed by      and the display will revert back to show the temp and an umbrella symbol will be shown.
(This umbrella symbol signifies that the heating has been turned off)
The gauge should return to standing pressure within a couple of seconds of the demand ending.