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28 Aarrow Sherborne GSL CF
SERVICING
Is the gas supply
turned on?
Does the pilot
ignite?
Yes
Does the pilot
stay alight?
Yes
Does the main
burner light?
Yes
No
Is their air in
the system?
Yes
Is the main
injector blocked?
Yes
Clean and
replace as
necessary
Is the supply
pressure
correct?
No
Is the
thermocouple
o.k.?
No
Check gas supply and operation of
control valve. Replace if necessary.
Is their a spark at the
electrode?
No
Is pilot flame the correct
size & playing onto
thermocouple
Replace the pilot
OSD assembly
No
No
No
Turn gas
on
Purge system
Yes
Correct
pressure
No
Replace pilot
assembly
OSD
No
Yes
Check for
spark output
from control
valve.
Yes
Check if gas
is passing
from control
valve.
Yes
No
Replace pilot
OSD assembly
Yes
No
Confirm supply
pressure is correct
FAULT DIAGNOSIS
START
Does the stove
stay alight?
Yes
Fire satisfactory
No
Investigate for blocked chimney
and adaquate ventilation check
spillage. If their is no obvious
blockage, seek expert advise.
No
Replace
control
valve
Yes
Replace pilot
OSD assembly
Investigate control valve
operation and replace if necessary.
OSD
PILOT -
Oxygen
Sensing
Device
Pilot