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7.12.3 FAULT FINDING TEST ‘1’
TEST1
CHECK
SUPPLY
INCOMING
YES
NO
NO
CHECK
FUSE ON
INPUT BOARD
IS THERE
PLUG X1 (L & N)
230V AT
YES
YES
NO
END OF
TEST
INPUT PCB &
CHECK CONTINUITY
BETWEEN
MAIN PCB
ELECTRICAL
SUPPLY TO BOILER
SWITCH ON
IS THERE
PLUG M6 ON INPUT
BOARD?
230V AT
IS THERE
PLUG M5 ON INPUT
BOARD?
230V AT
7.12.4 FAULT FINDING TEST ‘1A’
TEST 1A
IS THERE
AT TERMINALS
1 & 7 OF
10-14 Vdc
PLUG X7
GO TO
TEST 1
CHECK
CONTINUITY OF
RIBBON CABLE
REPLACE
DISPLAY PCB
YES
NO
YES
TERMINALS
230V AT
1 & 3 OF
PLUG X10
24Vac
6 & 7 OF
PLUG X10
NO
YES
YES
IS THERE
PLUG X1
230V AT
(L & N)
YES
NO
YES
1 & 7 OF PLUG X7a
IS THERE
AT TERMINALS
10-14 Vdc
OF DISPLAY PCB
NO
YES
NO
IS FUSE
F1 OK?
NO
AT TERMINALS
REPLACE
TRANSFORMER
ARE
F2 & F3
FUSES
OK?
NO
REPLACE
FUSE
REPLACE
PCB
REPLACE
PCB
REPLACE
FUSE/S