Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Remove white wires from connections 3 & 5 on integral timer
Put a link in the wires to join them together
Rest them on the top of the plastic cover on the control board.
DO NOT HOLD WIRES
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Does pump now run for CH Demand?