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14
221045A
3 F a u l t F i n d i n g
Diagram 3.8 cont.
Isolate supply disconnect Red in line connectors to
flow switch, is there continuity across flow switch?
Faulty LED.
Does not
effect boiler
operation.
Faulty DHW thermistor.
Replace.
Reconnect flow switch,
disconnect Purple in line
connectors to DHW thermistor.
Is the resistance between
8K
Ω
and 11K
Ω
?
Faulty flow switch.
Replace.
NO
YES
Turn the DHW flow off.
Turn on the CH.
Does pump run?
Faulty main PCB.
Replace.
YES
Faulty DHW O/H stat.
Replace.
Is there continuity across
C and N/O at low water
pressure switch?
Faulty main PCB.
Replace.
Faulty water
pressure switch.
Replace.
Isolate supply, remove
CN1. Is there continuity
across DHW O/H stat?
(a)
(b)
(c)
YES
YES
YES
YES
YES
NO
NO
YES
NO
NO
NO
NO
YES
SYSTEM O.K.
YES
NO
Faulty
multifunctional
control.
Restore supply.
Is there about 24V
ac multifunctional
control?
Is burner pressure
about 5.6mb?