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17.0 Fault Finding
53
© Baxi Heating UK Ltd 2011
IGNITION LOCKOUT
YES
Is there
gas at gas valve inlet ?
Check isolation valve and
gas supply.
YES
NO
Reset Lockout.
Is there gas flow
(check at meter) ?
Remove
5-way connector
from gas valve. Is there 240
Vdc between I & J
during ignition ?
Is
spark or flame detection
probe damaged ?
Replace PCB.
Rectify wiring.
Replace Gas Valve.
Clear blockage and dry
sensors.
Set spark gap to 3.5mm.
Clean burner or replace as
necessary.
YES
YES
NO
NO
YES
Remove Gas Valve & check
inlet filter for blockage.
Otherwise incorrect gas supply
to boiler.
Is
there at least
18mbar dynamic at gas valve
inlet ?
Lead from PCB to Gas
Valve faulty.
Is
spark gap between 3 and
4mm ?
Replace spark or flame
detection probe and
gaskets.
Is
wiring from PCB
to spark probe & flame
detection probe OK ?
NO
YES
NO
NO
YES
YES
NO
NO
I
Remove
the larger of the
two 6-way PCB connectors.
Is there continuity from I to L
& from J to K ?
Is
Condensate Trap
blocked or water on
terminals ?
Is the
burner blocked or
damaged ?
Replace PCB.
YES
NO
YES
NO
J
K
L
Gas Valve 5-way
Connector Plug
6-way Connector
Lights
On Off On
Is
Condensate Pump
reservoir full ?
NO
YES
Check and if necessary
change over level switch
(see Section 13.5)