30
7.4.8
GAS VALVE FINAL SETTING - MM
Select the MM parameter by turning the DHW
temperature control, the boiler starts at the me-
dium power and it is possible to change the power
of the boiler turning the CH temperature control in
order to check the CO
2
in the overall range of the
boiler.
7.4.9
MAXIMUM OUTPUT CH (FAN SPEED) - 23
Select the parameter 23 by turning the DHW
temperature control. Push MODE button and
modify the maximum fan speed as indicated in the
table page 28 by turning the DHW temperature
control. Push MODE button to store the value.
7.4.10 MINIMUM OUTPUT CH (FAN SPEED) - 24
Select the parameter 24 by turning the DHW
temperature control. Push MODE button, it is
possible to modify the minimum fan speed by
turning the DHW temperature control. Push MODE
button to store the value.
7.5
COMBUSTION ANALYSIS TEST
A combustion analysis check can easily be car-
ried out on the appliance via the test points located
on the top of the appliance, however you must
check that the CO
2
values are set correctly (see 7.4).
●
Insert the flue gas analyser probe into the flue
gas test point (see fig. 43).
●
Operate the boiler in HH - LL and compare the
values with those shown in 7.4.6. If different
adjust the gas valve according to 7.4.6. and
7.4.7.
7.6
CHECKING THE EXPANSION VESSEL
Carry out the component removal procedure as
described in 6.4. You must ensure that the boiler
is completely drained of water.
Using a suitable pressure gauge, remove dust cap
on expansion vessel and check the charge
pressure. The correct charge pressure should be
1.0 bar ± 0.1 bar. If the charge pressure is less,
use a suitable pump to increase the charge.
NOTE
You must ensure the drain valve is in the open
position whilst re-charging takes place. Replace
the dust cap and carry out the relevant commis-
sioning procedure (section 5).
7.7
EXTERNAL FAULTS
Before carrying out any faultfinding or component
replacement, ensure the fault is not attributable to
any aspect of the installation.
7.7.1
INSTALLATION FAULTS
7.8.1
EARTH CONTINUITY TEST
Isolate the appliance from the electrical supply,
and using a suitable multi-meter carry out a resist-
ance test. Connect test leads between an appli-
ance earth point and the earth wire of the appliance
supply cable. The resistance should be less than
1 OHM. If the resistance is greater than 1 OHM
check all earth wires and connectors for continuity
and integrity.
7.8.2
SHORT CIRCUIT CHECK
Isolate the appliance from the electrical supply,
and using a suitable multi-meter, carry out a short
circuit test between the Live & Neutral connec-
tions at the appliance terminal strip (fig.17).
Repeat above test on the Live & Earth connec-
tions at the appliance terminal strip (fig.17).
NOTE
Should it be found that the fuse has failed but no fault
is indicated, a detailed continuity check will be
required to trace the fault. A visual inspection of
components may also assist in locating the fault.
7.8.3
POLARITY CHECK
With the appliance connected to the electrical
supply and using a suitable multimeter, carry out
the following voltage tests:
●
connect test leads between the Live & Neutral
connections at the appliance terminal strip (fig.17).
The meter should read approximately 230V ac.
If so proceed to next stage. If not, see 7.8.4.
●
connect test leads between the Live & Earth
connections at the appliance terminal strip (fig.17).
The meter should read approximately 230V ac.
If so proceed to next stage. If not, see 7.8.4.
●
connect test leads between the Neutral & Earth
connections at the appliance terminal strip (fig.17).
The meter should read approximately 0 – 15Vac.
If so polarity is correct. If not, see 7.8.4.
7.8.4
REVERSED POLARITY OR SUPPLY FAULT
Repeat the above tests at the appliance isolator,
if testing reveals correct polarity and/or supply at
the isolator, re-check wiring and connections be-
tween the isolator and the appliance.
If tests on the isolator also reveal reversed polarity
or a supply fault, consult the local electricity
supplier for advice.
7.8.5
RESISTANCE TO EARTH CHECK
Isolate the appliance from the electrical supply, and
using a suitable multi-meter carry out a resistance tes.
Connect test leads between the Live & Earth connec-
tions at the appliance terminal strip (fig. 17). If the meter
reads other than infinity there is a fault that must be
isolated, carry out a detailed continuity check to identify
the location of the fault.
IMPORTANT
These series of checks must be carried out before
attempting any faultfinding procedures on the
appliance. On completion of any task that required
the disconnection and re-connection of any elec-
trical wiring or component, these checks must be
repeated.
7.9
FAULT FINDING
Before attempting any faultfinding, the electrical
checks as detailed in 7.8 must be carried out.
Isolate the appliance from the electrical supply.
Disconnect any external controls from terminal
plug M6 (Fig. 48), and insert a link-wire between
the two Black wires at terminal plug M6 (Fig. 48).
Symptom
No ignition
No hot water
No central
heating
Possible causes
Check wiring. Check electrical supply
Check hot/cold pipe work is not reversed
Check wiring of time clock and/or room thermostat
Fault code
10
30
40
Possible causes
Gas supply problem. Gas line requires purging.
Reversed polarity. Broken, internal flue joint
Debris in flue system.
Insufficient water pressure. Air in boiler
7.8
ELECTRICAL CHECKS
Any electrical checks must be carried out by a
suitably qualified person.
