Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
CH Demand
Attach temperature clamp to CH flow pipe
CH potentiometer set to MAX
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow boiler to fire up and reach maximum temperature (approx 82°C) or go to lockout
(some radiators may be turned off to reduce the time taken).