Owner manual
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14 Fault Finding
14.1 Preliminary fault nding
The following checks should be performed before proceeding
onto specic diagnostics:
• Check the external electrical supply to the boiler is on and
a supply of 230V is present at the ‘L’ and ‘N’ terminals at
the installer interface.
For access remove and open the electrical cartridge, see
diagrams 11.4. and 11.1.
Test at the ‘L’ and ‘N’ terminals on the installer interface,
refer to diagrams 11.1 and 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 14.1 and
hinge down the control box.
Unclip the rear cover to gain access to the main PCB.
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 8.1.
• Check pressure at the gas service isolation valve, refer to
section 12.4.
• Check that the heating system pressure indicates at least
1mb, if not, ll and vent the system as described in section
12.2.
• Check that all external controls are on.
• Check the functional ow 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 14.6.
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’ and ‘-’ buttons for 5 seconds.
b) The display will stop ashing and alternate between the
fault memory number and the fault code.
c) Press ‘+’ button to scroll through the fault memory
(Position 1 is most recent), see fault codes.
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 14.8 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 14.7.
14028
Diagram 14.3
Diagram 14.2
13845
14291
Diagram 14.1