Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
CH Demand
Attach temperature probe to pipe as indicated by the red arrow.
Set boiler temperature control for CH to max
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Run the appliance and allow the system to heat.
Note:
To speed up the process the heating load can be reduced by turning off some radiators. If overheat occurs Isolate Appliance Immediately.
Please choose from one of the options below:
BURNER SHUTS DOWN AT APPROXIMATELY 85°C
BOILER GOES TO OVERHEAT BEFORE 85°C
TEMPERATURE EXCEEDS 85°C AND CONTINUES TO HEAT