VOKERA Linea Installation & Servicing Instructions Manual - page 30
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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
40
Possible causes
Gas supply problem. Gas line requires purging.
Reversed polarity. Broken, internal flue joint
Insufficient water pressure. Air in boiler
7.5 COMBUSTION ANALYSIS TEST
A combustion analysis check can easily be carried 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. 37).
- 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 commissioning 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 ELECTRICAL CHECKS
Any electrical checks must be carried out by a suitably qualified
person.
7.8.1 EARTH CONTINUITY TEST
Isolate the appliance from the electrical supply, and using a suitable
multi-meter carry out a resistance test. Connect test leads between
an appliance 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
connections at the appliance terminal strip.
Repeat above test on the Live & Earth connections at the appliance
terminal strip.
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. 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. 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. 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 between 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 connections 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 electrical
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, and insert a link-wire
between the two Black wires at terminal plug M6.
NOTE
Restore the electrical supply to the boiler and turn the selector
switch to the on position. The boiler should now function as
described in section 7.2. Should the boiler fail to respond, the
internal fuses and connectors should be checked to ensure integ-
rity and continuity. If the boiler still fails to respond, refer to the
detailed faultfinding flowcharts overleaf.
7.10 TEMPORARY FAULT CODES
The built-in fault diagnostic system automatically displays a unique
faul code that can be used to determine why the boiler has temporarily
locked out. When the boiler displays a temporary fault code, the
appropriate code is shown flashing on the display, accompanied by
the symbol
.
7.11 FINAL FAULT CODES
When the boiler displays a final fault code, the appropriate code is
shown flashing on the display, accompanied by the symbol
(RESET).
7.11.1 CODE ERROR +
(RESET) ONLY
To reset the boiler, push
button. If the boiler starts without any
problems, the lock-out is probably due to an accidental situation.
7.11.2 CODE ERROR +
(RESET) +
Refer to the following section and the detailed fault finding flow-
charts overleaf.
DHW MINIMUM
ADJUSTMENT
RED SCREW
MAXIMUM POWER
ADJUSTMENT
NUT
Fig. 42