Baxi Combi 130 HE Installation & Servicing Instructions Manual page 51

Fan (L9)
Is there at
least 24Vdc at M ?
YES
When
NO
display shows 12 or 22,
is there at least
2Vdc at N ?
YES
Is there at
least 24Vdc at O ?
YES
When
display shows 12 or 22,
is there at least
2Vdc at P ?
YES
When
NO
display shows 12 or 22,
is there at least
12Vdc at Q ?
YES
Is continuity
of all 5 wires from Fan
PCB to Fan OK ?
YES
YES
Does fan run ?
NO
Replace Fan.
NO
Replace Main PCB.
Replace Main PCB.
NO
Wiring from Main PCB
to Fan PCB faulty.
NO
Wiring from Main PCB
to Fan PCB faulty.
Replace Fan PCB.
NO
Wiring from Fan PCB
to Fan faulty.
Is there continuity from
R to S ?
YES
Replace Main PCB.
15.0 Fault Finding
Mains Input
Burner On
&
Fault Neons
Pump
Diverter Valve
Gas Valve
Modem PCB
Room Thermostat
NO
Wiring from Fan PCB
to Main PCB faulty.
Key to Wire Colours
R - Red
Br - Brown
W - White
G - Green
B - Blue
Transformer
Flow &
Return
Thermistors
Overheat
Thermostats
&
Flow Switches
&
Condensate Trap
Fan
S
Display PCB
Room Control
Fan PCB
Q
0
P
R
Br G
W R
B
Fan Connection
Br G
R W B
Fan PCB Connection
N
M
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