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17.0 Fault Finding
51
© Baxi Heating UK Ltd 2011
No Switched Live to
boiler. Check System
Controls and System
Wiring.
240V at C ?
Check P/L wiring from
terminal block to PCB.
Check for short circuit on
condensate pump, fan &
gas valve. Replace if
shorted & replace fuse.
YES
NO
Replace PCB.
YES
YES
NO
NO
ELECTRICAL SUPPLY
240V at B ?
PCB fuse OK ?
C
Fuse
B
N
S/L
Lights
Off Off Off
P/L
A
D
No Permanent Live to
boiler. Check Mains Fuse
and
System Wiring.
240V at D ?
Check S/L wiring from
terminal block to PCB.
YES
NO
NO
240V at A ?
YES