Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Ensure boiler is cool
Ensure appliance auto air vent is open (located pump manifold)

Measurement:

  • Open manual air vent (top of heat exchanger) & remove any air that may be present.
  • Check for & remove any air present in the heating system.
    Note.
    Check system pressure is still correct & re-pressurise as required.