Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Appliance drained and discharged

Observation:

Remove the braided hose bypass pipe, care must be taken not to lose any parts of the internal bypass when removing the hose.
Remove the internal bypass valve from the hose / right hand side hydraulic block.
Inspection 1.
Inspect the internal bypass valve for contamination and damage.
Ensure there is light spring tension to confirm correct operation.
Inspection 2.
Inspect the braided hose bypass pipe for blockages / restrictions.
Note.
Do NOT refill the appliance If the bypass and hose inspections are satisfactory.