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13 Fault Finding
13.1 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 10.3 for access and
diagram 13.3.
•Check the electrical installation and carry out tests for, earth
continuity, polarity, short circuit and resistance to earth,
using a suitable multimeter.
An Aid to Test
To access the connector plug and pins 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 13.1.
• Check the electrical supply of 230v is present at L and N
terminals, position X17 on the main PCB and chassis earth at
a bare metal point on the boiler, see diagram 13.2.
• Check that there is a gas supply to the boiler and the gas
service isolation valve is turned on, see diagram 11.2.
• Check pressure at the gas service isolation valve, refer to
section 11.5.
• Check that the heating system pressure indicates at least
1mb, if not, fill and vent the system as described in section
11.3.
• Check that all external controls are on.
• Check the functional flow diagram, 13.5.
13.2 Fault Codes
Fault codes take priority over all other display functions in the
event of a fault occuring, see diagram 13.6.
If multiple faults occur the codes will be displayed for approx.
2 seconds, alternatively.
13.3 Fault Memory
The Fault memory stores details of the ten most recent faults.
To access this menu, refer to diagram 13.3
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.
13.4 Diagnostic Menu
The Diagnostic Menu provides the ability to view and
change certain parameters. See diagram 13.7 for available
parameters.
13.5 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 13.8.
13738
Diagram 13.1
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