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Temperature sensors faulty.
C
old resistance approximately
1
0
k
@ 2
5
°
C
(DHW and
C
H sensors)
20
k
@ 2
5
°
C
(Flue sensor)
(resistance reduces with increase in temp.)
NO
E
Replace sensor
Gas at burner
Ensure gas is on and purged
Replace
PC
B
Replace gas valve
PC
B -
X
3 connector is 230V A
C
across terminals
1
& 2
Y
ES
NO
NO
F
Replace
PC
B
C
hec
k
and correct if necessary
1
. Ignition electrode and lead
2. Electrode connection
3. Spar
k
gap and position
Voltage at
PC
B -
X
2 connector is
11
0V D
C
across terminals 2 &
5
(Note: from multimeter connect
common to 2 & volts to
5
)
C
hec
k
wiring
Y
ES
NO
Replace igniter
Y
ES
G
C
hec
k
and correct the connection of
the tube between the venturi and
gas valve
1
.
2.
5.5
8.5
13
Electrode
P
osition
Viewing Window
Burner
51
© Baxi Heating UK Ltd 2015