Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Case Removal
Loosen the bottom 2 screws and undo
the 2 screws at the top of the boiler and
slide case off forwards
Facia Panel
Remove the screw and lower the panel downwards.
Take care not to damage the pressure gauge capillary tube or electrical connections.
Notes:
CARE! - The inner case of this appliance may have sharp edges.
This diagnostic model does not include the optional diverter valve kit.
Using this model on a boiler with the diverter valve kit fitted may lead to misdiagnosis.