Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
CH Demand
CH temperature control set to MAX
Attach temperature clamp to the main flow and return pipes to the primary heat exchanger
Note: Ensure a good connection is made, it may be
easier to use the probe style temperature sensors
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the boiler to run for central heating and the system to heat up.
Measure the temperature differential.
Expect a differential of approx 20°C or less.
Note.
1. Ensure all radiators are open and system is balanced correctly to provide correct test results.
2. Initial temperature differential may be greater than 20°C when system is heated from cold.
3. If using the Sprint V3 FGA the flow pipe needs to be earthed or it will read incorrectly.
    Click HERE for more information.