Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
CH Demand
Set selector switch to ch/dhw
Set CH temperature control to approximately 50°C
Attach FGA temperature clamp to the flow pipe as close
to the boiler as possible
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow system to reach the set operating temperature (approximately 50°C) then turn off CH demand.
Set CH temperature control to maximum and reinstate the CH demand, Observe the temperature of the flow pipe falling as system extracts heat.
Expected temperature drop greater than 20°C.
Note.
JP2 fitted there is no anti-cycle delay.
JP2 removed a 3 minute anti-cycle is enabled.