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6.3 Gas Valve Replacement
Step 1 Remove the burner assembly as
described in the section 4.3 Servicing.
Step 2 Open the left hand access door and
detach the impulse hoses from the air pressure
switch.
Step 3 Remove the 4 screws holding the burner
head onto the burner assembly and carefully
pull burner head assembly from housing.
Step 4 The burner head can now be detached
by disconnecting the impulse tube and the
burner head wiring.
Step 5 From within the combustion chamber,
remove the two screws holding the front of the
gas valve.
Step 6 Turning the housing over, remove the
four screws holding the rear burner plate in
position.
Step 7 Open the two side doors and remove the
rear plate assembly.
Step 8 Whilst the valve is still attached to the
plate, the jet carrier, gas inlet, and wiring
harness can now be detached from the gas
valve.
Step 9 The two screws retaining the gas valve
can then be removed.
Step 10 The gas valve can now be replaced.
Step 11 Refit all components in reverse order.