Chart 3. Motor runs
Full Sequence Control
produces ignition sparks,
but gas does not ignite
Start
Remove plinth 199. Can gas be
lit manually?
Exchange solenoid coils in turn.
Does gas light?
Whilst control is sparking is
voltage at gas control relay PCB
terminal T1 230V?
Exchange Heater Assembly.
Does gas light?
Whilst control is sparking is
voltage at terminal 4 of control
unit 230V?
Is voltage between input and
neutral on each solenoid 230?
No
No
No
Yes
No
Yes
Check spark gap continuity of
H.T. lead and electrode not
cracked. Does burner light?
Exchange control unit. Does gas
light?
Check continuity of wiring
between 4 Way housing and
relevant solenoid also neutral
wiring. Check plug clean and
tight. Does gas light?
Fault in gas system rectify as
necessary.
Check wiring between control unit
and 4 Way Terminal block. If
necessary exchange 143°C inlet
temperature limiter. Does gas
light?
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
No
Refer to
Chart 4
Does gas stay on?
Machne operating. Intruct user
as necessary.
Yes
10
Check gas control relay wiring.
Exchange if wired correctly. Does
gas light?
Yes
No
No
Yes
Using the looping connections
on the terminal block on the
base at the rear, check that the
voltage to the solenoids is 230V
whilst the control is sparking.
No
No
Yes
Yes
No
No
No
