Baxi Combi 130 HE Installation & Servicing Instructions Manual page 57

Intellistat
Is the Intellistat
display blank ?
NO
Is
there a Sun
symbol near the bottom
right of the Intellistat
display ?
YES
Is the
temperature in the
middle of the display at least
2° C less than the temperature
at the top of the
display ?
YES
Is there at least 4Vdc
from E to F ?
YES
Unplug
Diverter Valve.
Ensure all DHW taps are off.
Is there 240V from G to I &
from H to I ?
NO
Is there 240V from
J to K & from J to L ?
NO
PCB faulty.
Hinge
YES
down the flap below
the Intellistat display. Press
the Intellistat Reset Button. Is
the display still
blank ?
With the hinge down flap
located below the display
NO
in the shut position,
press the right arrow
button on the Intellistat
until the Sun symbol
appears and read the
Intellistat instructions.
Turn the knob at the
NO
bottom right of the
Intellistat fully clockwise
and read the Intellistat
instructions.
NO
Is there continuity from
C to E ?
YES
Intellistat faulty.
YES
Diverter Valve faulty.
YES
Wiring from PCB to
Diverter Valve faulty.
Diverter Valve Plug
(when unplugged)
15.0
YES
Is there 5V from
A to B ?
YES
Intellistat faulty.
Terminal Block
in Boiler
+ S
D E
Wiring from boiler to
Intellistat faulty.
NO
K
J
L
G
H
I
Fault Finding
Wiring from boiler to
Intellistat faulty.
YES
NO
Is there 5V from
D to F ?
NO
PCB faulty.
Intellistat
Terminal Block
-
+ -
A B
F
Transformer
Mains Input
Burner On
&
Fault Neons
Pump
Flow Switches
Condensate Trap
Diverter Valve
Gas Valve
Modem PCB
Room Thermostat
Room Control
S
C
Flow &
Return
Thermistors
Overheat
Thermostats
&
&
Fan
Display PCB
57