Technical data

51
Is there 230Vac at
connector X6 pin 4 ?
FAIL POINT F (Ignition Sequence Lockout)
No
Yes
Yes
No
Is the gas supply
connected and at the
correct pressure?
Note: If gas supply
has been interrupted
it may take some
time to purge gas to
the pilot assembly.
Replace control
board.
Does the fan run at
the start of a
demand?
No
Yes
Rectify gas supply
problem.
Is there 230Vac at
connector X6 pin 2 ?
No
Repair or replace fan
or fan cable.
Yes
Air pressure switch
not resetting.
Replace air pressure
switch.
Does fan run until
lockout occurs
(approximately 2
minutes) ?
No
Fan runs for a few
seconds.
Replace control
board.
Yes
Is there a spark at the pilot
assembly
(combustion chamber cover
may need to be removed to
aid viewing) ?
Is there 230Vac at
connector X8 pin 3 ?
Yes
No
No
Check condition of spark elec-
trode and ingntion lead
between ignition unit and
spark electrode. If o.k. replace
spark igniter unit (fitted onto
gas valve).
Air pressure switch has not
changed over. Are the sili-
cone tubes in good condition
and free of condensation?
Note: If appliance is not fan
assisted, check links are fit-
ted to connector X6. If so,
replace control board.
Replace tubes.
If condensation has
occured it is wise to
replace the air
pressure switch.
No
Yes
Inspect the flue.
Is it free of any
restrictions?
Rectify flue problem.
No
Yes
Replace air pressure switch. In
the unlikely event of this not
solving the problem, inspect
the pressure pick up (venturi)
in the fan.
Yes
Is there a pilot flame at the
pilot assembly
(combustion chamber cover
may need to be removed to
aid viewing) ?
No
Remove ignitor unit
from gas valve.
measure the resis-
tance across the two
outer electrical pins
on the gas valve. Is
resistance between
6k
ΩΩ
and 9k
ΩΩ
?
No
Replace gas valve.
Yes
Inspect pilot tube for blockage
and bad mechanical
connections.
Also check spark jumps across
gas outlet. If all o.k. replace
ignitor unit
Yes