Set Appliance State:

Mains Power Off
CH Demand
Turn Hot Water Tap On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Test 1:
Once the pump begins to run visually inspect the pump proving spindle, does the spindle extend smoothly to its fully extended position within 1 second of the pump starting to run?
 
Mains Power OFF
The spindle should move back to its fully retracted
position within 1 second of the pump stopping.
Test 2:
Turn Hot Tap OFF. Mains Power ON
With a CH demand does the spindle still
extend within 1 second of the pump starting?
 
Mains Power OFF
Does the spindle still retract within 1
second of the pump stopping?