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INSTALLERS
Wiring diagram
1
2
3
4
5
6
7
8
9
10
60
Wiring diagram
1 - Overheat thermostat
2 - Fan
3 - Gas valve
4 - Heating return
thermistor
5 - Heating flow thermistor
6 - Water pressure sensor
7 - Pump
8 - Water flow sensor
11
12
13
Fault finding
NOTE
Before trying to operate the
boiler make sure that :
• All gas supply cocks are
open and that the gas
supply has been purged of
air.
• There is a permanent
14
mains supply to the boiler.
• There is a heating demand
15
from the external control.
16
WARNING.
Always isolate the boiler
from the electrical supply
17
before carrying out any
electrical replacement work.
9 - User interface
16 - Chassis earth
10 - Room thermostat
17 - Main reset switch
11 - Ignition and controle
electrode
12 - Ignition module
13 - DHW temperature
sensor
14 - Three way valve
15 - Fuse 630 mA
Always check for gas
short circuit and resistance
soundness after any service
to earth checks must be
work.
repeated using a suitable
multimeter.
Electrical Testing
To carry out the electrical
Should there be any doubt
test, gain access, as follows :
about the voltage supply to
Hinge down the control box
any of the components, it is
and remove Torx screws
possible to carry out a
and unhook the rear panel,
simple electrical test.
refer diagram 2 page 54.
Refer to the Wiring diagram
Important. On completion
and fault finding charts
of the Service/Fault Finding
diagrams.
tasks which have required
the breaking and remaking
of the electrical connections
the earth continuity, polarity,
61
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