Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Appliance drained and discharged
Remove the CH filter from the right hand side hydraulic block
CH filter is located behind the pressure gauge
Note.
If the right side panel can be partially removed then the CH filter and pressure gauge can be removed separately, but if side access is difficult then the complete right hand side hydraulic block will need to be removed.

Observation:

Inspect the CH filter for blockages / restrictions and damage.