24
Compact
7.11 ELECTRICAL CHECKS
Any electrical checks must be carried out by a
suitably qualified person.
7.11.1 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.
7.11.2 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. 14).
Repeat above test on the Live & Earth connec-
tions at the appliance terminal strip (fig. 14).
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.
7.11.3 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.14); the meter should
read aproximately 230V ac. If so proceed to next
stage. If not, see section 7.11.4.
Connect test leads between the Neutral & Earth
connections at the appliance terminal strip (fig.14);
the meter should read aproximately 0 – 15Vac. If
so polarity is correct. If not, see section 7.11.4
7.11.4 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.
7.11.5 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 terminal
strip (fig.14). If the meter reads other than infinity
there is a fault which 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 fault finding procedures on
the appliance. On completion of any task which
required the disconnection and re-connection of
any electrical wiring or component, these checks
must be repeated.
7.11.6 FUSES
The appliance is equipped with spare fuses.
These fuses are located on the cover of the main
PCB. If a fuse has blown it is usually indicative of
an external wiring fault or a faulty component
such as the pump, fan, valve actuator, etc. Under
no circumstances should a blown fuse be replaced
with one of a higher rating.
7.12 FAULT FINDING
BEFORE ATTEMPTING ANY FAULT
DIAGNOSIS OR REPAIR THE FOLLOWING
PROCEDURE SHOULD BE CARRIED OUT:
● Carry out the relevant electrical checks as
detailed in section 7.11
● Disconnect any external wiring from the room
thermostat connections of the appliance
terminal strip and replace with a solid link wire.
● Ensure the appliance is protected – externally
– by a 3 amp fuse.
FAULT POSSIBLE CAUSES REMEDY
APPLIANCE FIRES THEN LOCKOUTS INCORRECT GAS PRESSURE CHECK INCOMING PRESSURE
AND/OR BURNER PRESSURES
FLUE BLOCKED OR BROKEN CHECK FLUE ASSEMBLY
APPLIANCE WON’T FIRE FOR HOT WATER HOT & COLD PIPES REVERSED CHECK EXTERNAL PLUMBING
FLOW REGULATOR BLOCKED REMOVE AND CLEAN
INSUFFICIENT FLOW RATE INCREASE FLOW RATE
APPLIANCE WON’T FIRE FOR HEATING EXTERNAL CONTROL OR
WIRING FAULT CHECK EXTERNAL CONTROLS
OR WIRING
APPLIANCE FIRES FOR HEATING FLOW & RETURN SERVICE
BUT NO CIRCULATION AROUND SYSTEM VALVES CLOSED OPEN SERVICE VALVES
AIR IN APPLIANCE OPEN DUSTCAP ON ‘AAV’
PUMP STUCK OPEN VENT PLUG ON PUMP AND
ROTATE SHAFT
DEBRIS IN SYSTEM FLUSH SYSTEM
APPLIANCE INACTIVE NO ‘LED’s ELECTRICAL SUPPLY FAULT CHECK SUPPLY TO APPLIANCE
SHOWING FOR 240V BETWEEN ‘L’ & ‘N’
BLOWN FUSE CHECK AND REPLACE
7.10 POSSIBLE INSTALLATION FAULTS
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