Fault Finding; Diagnostic Led Indicators; Faulting Finding Codes; Central Heating Fault Finding - Biasi RIVA OV M110.18SM/OV User Manual And Installation Instructions

8

Fault Finding

8.1 Combustion Check
Before looking for a fault condition, check that:
The mains electrical supply is
The room or cylinder/tank thermostat
(where fitted) are calling for heat.
The gas service cock is open.
The system is at design
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
CONTINUITY, POLARITY and RESISTANCE TO
EARTH.
For further information contact: BIASI UK Ltd
Technical helpline: 0121 506 1350.
8.2

Diagnostic LED Indicators

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.
8.3 Fault Finding Codes
In the event of the appliance failing to light,
to the Diagnostics Chart.
8.4

Central Heating Fault Finding

Upon a demand for Central Heating,
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
anti cycle mode is initiated which prevents the
appliance from firing in CH mode for 5 minutes.
turned on.
pressure.
check for EARTH
refer
(closure of
removed, an
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.
Fig 32. Fascia Panel
29