8
FAULT FINDING
GENERAL
8.1
Before looking for a fault condition, check that:
G
The mains electrical supply is turned on.
G
The room or cylinder/tank thermostat (where fitted) are calling
for heat.
G
The gas service cock is open.
G
The system is at design pressure.
Before attempting any electrical fault finding, always conduct the
preliminary electrical system checks as described in the Instructions
for the British Gas Multimeter, or other similar instrument.
On completion of any service or fault finding operation involving making
or breaking electrical connections, always check for EARTH
CONTINUITY, POLARITY and RESISTANCE TO EARTH.
Detailed procedures for replacing faulty components are described in
section 9 (Parts Replacement).
For further information contact: Halstead Glen Dimplex service helpline
Tel: 0844 371 1111.
CENTRAL HEATING FAULT FINDING
8.4
Upon a demand for Central Heating, (closure of the time switch and
room thermostat, where fitted), the controls should carry out a set of
start up checks, followed by an ignition sequence. Refer to Section 5.2.
If the control has powered up correctly but does not respond to a CH
demand. Remove plug cover and check voltage between L3 (orange) and
N (blue). If 0 V ac, check external programmer / room thermostat. If 230
V ac, check control for lockout or blocking codes, (refer to section 8.3),
check operation of the external pump.
Note:
Whenever a CH demand is removed, an anti cycle mode is initiated
which prevents the appliance from firing in CH mode for 5 minutes.
Ensure that the control is not in this mode by removing power from the
control and restoring it after a delay of 10 seconds.
If the Switch Live input is OK and no lockout or blocking code exists and
the control is not in anti– cycle mode, then replace PCB.
DIAGNOSTIC LED INDICATORS
8.2
FASCIA PANEL - Refer to Figure 32.
The LED shows code '
3
' in a lockout condition.
For fault finding refer to the diagnostic chart shown below.
FAULT FINDING CODES
8.3
In the event of the appliance failing to light, refer to the Diagnostics
Chart.
32
FASCIA PANEL
7 SEGMENT
DIGITAL DISPLAY
‘BURNER LIT’
INDICATOR DOT
CH CONTROL KNOB
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