© Baxi Heating UK Ltd 2008
37
Lockout Burner Mains
Ignition Lockout
Refer to the boiler wiring diagram
on
on
off
Yes
Is more than
17 mbar dynamic
pressure at the
gas valve
inlet ?
Incorrect gas supply
to boiler
Are Live and
Neutral to boiler
reversed ?
Correct the Live and
Neutral connections
Yes
No
No
No
Using meter test
dial, does gas flow
during ignition
sequence ?
Is there 200 VDC
at the gas valve
during ignition
sequence ?
Check the
continuity of the
gas valve lead
No
No
Yes
Replace gas valve
Yes
Replace PCB
Lead from PCB
to gas valve faulty
Yes
Does flame
establish and then
extinguish ?
Is flame
detection electrode
damaged ?
No
Is wiring to
the detection
electrode OK ?
Yes
Yes
Replace electrode
No
Set gap to correct position over falme strip
No
Rectify wiring
No
Is there
a spark ?
Is
spark electrode
damaged ?
Is the
electrode gap
between
3 and 4 mm ?
No
Is wiring from
spark generator
to electrode OK ?
No
Yes
No
No
Is the
flame detection
gap between
3 and 4 mm ?
Yes
Yes
Check the
continuity of the
spark generator
lead
Refit
8 way connector.
Is there 230 V to
spark generator
when gas valve
opens ?
Yes
No
Rectify wiring
Yes
Replace spark generator
Yes
Replace PCB
Yes
Yes
No
Fig. 45