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8.5 External faults
Before carrying out any fault-finding or component replacement, en-
sure the fault is not attributable to any aspect of the installation.
INSTALLATION FAULTS
Symptom
No ignition
Poor hot water
Unstable flame picture
8.6 Electrical checks
Any electrical checks must be carried out by a suitably qualified person.
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.
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.
Repeat above test on the Live & Earth connections at the appliance term.
b
Should it be found that the fuse has failed but no fault is indicat-
ed, a detailed continuity. Check will be required to trace the fault.
A visual inspection of components may also assist in locating
the fault.
POLARITY CHECK
With the appliance connected to the electrical supply and using a suit-
able multi-meter, carry out the following voltage tests:
- connect test leads between the Live & Neutral connections at the
appliance. The meter should read approximately 230V ac. If so pro-
ceed to next stage. If not, see REVERSED POLARITY OR SUPPLY
FAULT
- connect test leads between the Live & Earth connections at the ap-
pliance. The meter should read approximately 230V ac. If so pro-
ceed to next stage. If not, see REVERSED POLARITY OR SUPPLY
FAULT
- Connect test leads between the Neutral & Earth connections at the
appliance. The meter should read approximately 0 – 15Vac. If so
polarity is correct. If not, see REVERSED POLARITY OR SUPPLY
FAULT
REVERSED POLARITY OR SUPPLY FAULT
Repeat the above tests at the appliance isolator, if testing reveals cor-
rect polarity and/or supply at the isolator, re-check wiring and connec-
tions between the isolator and the appliance. If tests on the isolator
also reveal reversed polarity or a supply fault, consult the local elec-
tricity supplier for advice.
RESISTANCE TO EARTH CHECK
Isolate the appliance from the electrical supply, and using a suitable
multi-meter carry out a resistance test. Connect test leads between
the Live & Earth connections at the appliance. 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.
b
These series of checks must be carried out before attempting
any fault-finding 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 re-
peated.
Possible causes
Check external wiring.
Check cold supply is connected
to cold inlet.
Check gas supply.
Check adjust flow rate.
Check flue system.
8.7 Operating faults and reset
In the event of a fault, the displays summarised and described in the
table are shown.
Error type
Limit thermostat alarm
Air pressure switch fault
Burner thermostat alarm
Air pressure switch alarm
ACF alarm lockout module
ACF electronics fault alarm
parasite flame fault
Overtemperature fault
Domestic hot water NTC
Fault
Input NTC Fault
IIn the event of a transitory fault the appliance independently attempts
a reset of operations.
In the event of a permanent fault it is necessary to reset the normal
operation of the appliance by pressing the ON - OFF/RESET (A) key.
This operation can be repeated a maximum of 2 times. If the problem
is not resolved, request help from the Technical Assistance Centre.
The system provides for the alarms to remain operational even in the
ON-OFF/RESET state. In this state they are not displayed however.
In the event a lockout occurs when the function is OFF, to reset it the
water heater must be set to ON and then to OFF again.
8.8 Fault finding
Before attempting any fault-finding, the electrical checks as detailed in
8.6 ELECTRICAL CHECKS must be carried out.
Isolate the appliance from the electrical supply and remove the casing
and PCB cover.
Restore the electrical supply to the appliance, turn the selector switch
to the "on" position, and open a hot water outlet. The appliance should
now function as described in section 8.2 APPLIANCE MODE OF OP-
ERATION. Should the appliance fail to respond, the internal fuse and
connectors should be checked to ensure integrity and continuity. If the
appliance still fails to respond, refer to the detailed fault-finding flow-
charts overleaf.
22
Transitory
Error code
Definitive
Definitive
02
Transitory
03
Definitive
04
Definitive
03
Definitive
01
Definitive
01
Transitory
11
88°C
Definitive
flashing
Transitory
06
Transitory
08
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