Baxi Combi 130 HE Installation & Servicing Instructions Manual page 49

Ignition Lockout
Is there gas at gas valve
inlet ?
YES
Reset Lockout.
When the Burner On light
is on, is there gas flow
(check at meter) ?
YES
Is
there at least
18mbar dynamic at gas
valve inlet ?
YES
Have
boot lace seals
inside combustion box
door grown outwards so door
held away from
heat exchanger ?
NO
Is
the burner
YES
damaged or the burner
gaskets missing/damaged or
the wrong burner
fitted ?
NO
Is
YES
spark or flame detection
probe damaged ?
NO
Is
YES
spark gap between 3 and
4mm ?
NO
Set spark gap to
3.5mm.
NO
Check isolation valve
and gas supply.
NO
Remove Gas Valve & check
inlet filter for blockage.
NO
Check gas feed pipe seals,
venturi gasket & fan seals
are fited and not damaged.
Otherwise incorrect gas
supply to boiler.
YES
Trim back seals
Replace Burner or
burner Gaskets.
Replace spark or flame
detection probe and
gaskets.
Is
wiring from PCB
to spark probe & flame
detection probe OK & are
terminals tight ?
YES
Replace PCB if fault
persists. Replace gas
valve.
15.0 Fault Finding
Gas Valve Plug
(when unplugged)
Unplug
YES
Gas Valve,
is there 215 Vdc at F
when the Burner On light
is on ?
NO
Is
there 240Vac at G
when the Burner On
light is on ?
NO
Replace Main PCB.
Mains Input
Burner On
&
Fault Neons
Pump
Diverter Valve
G
Gas Valve
Modem PCB
Room Thermostat
NO
Rectify wiring and check
spades and receptacles
for a firm fit.
F
Replace Gas Valve.
YES
Lead from PCB to Gas
Valve faulty.
Transformer
Flow &
Return
Thermistors
Overheat
Thermostats
&
Flow Switches
&
Condensate Trap
Fan
Display PCB
Room Control
49