Glow-worm 18sxi, Installation And Servicing Manual, Page: 44 / 64

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14 Fault Finding
14.1 Preliminary fault finding
The following checks should be performed before proceeding
onto specific diagnostics:
• Check the external electrical supply to the boiler is on and
a supply of 230V is present at the ‘L’ and ‘N’ terminals on
the installer interface, refer to section 11.5 for access and
diagram 14.4.
•Check the electrical installation and appliance, carry
out tests for earth continuity, polarity, short circuit and
resistance to earth, using a suitable multimeter.
An aid to test
Remove the front casing panel, see diagram 13.1 and the
control panel securing screw then lower into service the
position.
Remove the rear panel by prising the retaining clips, see
diagram 14.1.
Carry out the tests at connector plug X17, see diagram 14.2.
Check chassis earth at a bare metal point on the boiler.
• Check that there is a gas supply to the boiler and the gas
service isolation valve is turned on, see diagram 12.2.
• Check pressure at the gas service isolation valve, refer to
section 12.6.
• Check that the heating system pressure indicates at least
1mb, if not, fill and vent the system as described in section
12.3.
• Check that all external controls are on.
• Check the functional flow diagram, 14.5
14.2 Fault Codes
Fault codes take priority over all other display functions in the
event of a fault occuring, refer to diagram 14.4.
If multiple faults occur the codes will be displayed for approx.
2 seconds, alternatively.
14.3 Fault Memory
The Fault memory stores details of the ten most recent faults.
To access this menu, refer to diagram 14.3:
a) Press and hold ‘MODE’ for 5 seconds.
b) When the display shows a flashing ‘0’ press ‘MODE’
button.
c) Press a ‘+’ button to scroll back through the fault memory
(Position 1 is most recent), see fault memory display.
To exit this menu, press the ‘MODE’ button.
14.4 Diagnostic Menu
The Diagnostic Menu provides the ability to view and
change certain parameters.
See diagram 14.7 for available parameters.
14.5 Status Codes
The status codes provide information about the current
operating condition of the boiler and can be accessed
through the diagnostic display, refer to diagram 14.8.
RETAINING
SLOTS
SECURING
SCREW
REAR
PANEL
CONTROL
PANEL
RETAINING
CLIPS
Diagram 14.1
13535
13452
Indicates
fault memory
position
Fault code
Fault memory display
Diagram 14.3
Diagram 14.2
13845
MAIN PCB BOARD
N
L
230Vac 50Hz
LIVE (PIN 3) AND
NEUTRAL (PIN 1)
TEST POINT
AT MAIN PCB BOARD
POSITION X17
230V
X1
7
X17
24
X1
9