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START.
ELECTRICAL MAINS
NOTE.
BEFORE
CHANGING
ANY
SUPPLY OFF.
COMPONENT INDICA TED IN THE
19.
FAULT FINDING
FOLLOWING GUIDE IT IS ESSENTIAL
THAT THE ASS0C1A TED WIRING IS
CHECKED FOR CONT1NIJITY AND
CORRECT ROUTINE.
NO
NO
TURN ON GAS SUPPLY AND CHECK
CHECK IGNITER LEADS AND
CHANGE SPARK IGNITER.
FOR GAS. DOES PIEZO IGNITER
CONNECTIONS. IS SPARK PRESENT?
PRODUCE SPARK AT PILOT?
YES
YES
NO
NO
NO
CAN PILOT BE LIT?
CHECK PILOT THROffiE SCREW ON
VENT GAS SUPPLY AT INLET
•J
CHECK FOR BLOCKED PILOT
I
GAS VALVE IS OPEN. CAN PILOT BE
PRESSURE TEST POINT ON GAS
INJECTOR. CHANGE IF NECESSARY.
LIT?
VALVE. CAN PILOT BE LIT?
CHECK PILOT FILTER.
YES
YES
YES
NO
NO
NO
DOES PILOT STAY ALIGHT?
INCREASE PILOT SCREW ON GAS
r
CHECKE.C.O.CONNECTIONSATTHE
~
' " " " " " " ' " " " ' " " ' " " " " ' n
VALVE. IF THE PILOT REMAINS
THERMOCOUPLE AND GAS VALVE
~~~SR~~~~~~~TS~~~ ~~~~~COUPLE
I~O
SMALL CHANGE INJECTOR. DOES
FOLLOWING PROCEDURE 5 IN THE
PILOT STAY ALIGHT?
MUL TIMmR HANDBOOK. MINIMUM
IS THE CLOSED CIRCUIT VOLTAGE INCREASED?
CLOSED CIRCUIT VOLTAGE 8 mV.
~YES
DOES PILOT STAY ALIGHT?
YES
YES
YES
I' " ""' ' " ' " ' " ""'
NO
CHANGE THE
NO
CHANGETHE
J
THERMOSTAT.
THERMOCOUPLE.
GAS VALVE.
DOES THE PILOT STAY
DOES THE PILOT
I
EXTINGUISH PILOT.
ALIGHT?
STAY ALIGHT?
NO
~YES
~YES
SWITCH ON MAINS SUPPLY.
IS THERE A LIVE SUPPLY TO OTHER
SET 3-POSITION SWITCH OR
TERMINALS?
PROGRAMMER !IF FITTED) TO OFF
NOTE
NO
+
POSITION. WAIT 3 MINUTES. IS
THE PUMP WIU OPERATE FOR ONE
THERE A LIVE SUPPLY TO TERMINAL
COMPLETE CYCLE 15 MINUTES) OF
I
CHECK EXTERNAL FUSES
I
L ON THE TERMINAL STRIP ONLY?
THE OVER RUN CONTROL
OR RECTIFY EXTERNAL
IMMEOtA TEL Y THE MAINS SUPPLY IS
YES
WIRING FAULT IF STILL
TURNED ON. ENSURE THAT THE
NO SUPPLY A TL.
PUMP IS NOT ORY.
I
REPLACE THE 3-POSITION SWITCH
YES
OR PROGRAMMER.
t
NO
SWITCH THE J.POSITION SWITCH TO
REPLACE 3-POSITION SWITCH OR
THE HW SETTING. ON UNITS FITTED
PROGRAMMER.
WITH A PROGRAMMER SET TO HW
24
hrs.
CH OFF. IS THERE A LIVE
SUPPLY TO TERMINAL 1 BUT NOT TO
2?
YES
NO
SWITCH THE 3-POSITION SWITCH TO
REPLACE 3·POSITION SWITCH OR
HW & CH. ON UNITS FITTED WITH A
PROGRAMMER.
PROGRAMMER SET HW & CH
SELECTORS TO ON. IS THERE A
LIVE SUPPLY TO TERMINALS 1 & 2?
•
YES
NO
ON MODELS FITTED WITH A
REPLACE PROGRAMMER.
PROGRAMMER SELECT EACH
AVAILABLE PROGRAMME IN TURN
WITH THE AID OF A MULTIMETER
DOES THE PROGRAMMER SELECT
HW AND CH IN THE CORRECT
SEQUENCE?
I.E. HW ONLY SHOULD ENERGISE
TERMINAL 1 ONLY
HW & CH SHOULD ENERGISE
TERMINAL 1 & 2 ONLY
t
YES
NO
YES
.
YES
SWITCH THE 3-POSITION SWITCH TO
~IS
THERE A LIVE SUPPLY TO
r~IISTHEREALIVESUPPLYAT
l__:.rl
REPLACE RELAY.
I
HW & CH OR IF A PROGRAMMER IS
TERMINAL4?
TERMINALS?
FITTED SET HW & CH TO ON.
J~
TURN HOT WATER AND HEATING
THERMOSTATS TO MAXIMUM. DO
THE FOUR POLE RELAY CONTACTS
CLOSE.
NO
NO
NO
REPLACE HOT WATER PRIORITY
REPLACE HOT WATER LIMIT
THERMOSTAT. DO THE RELAY
THERMOSTAT
CONTACTS CLOSE'
YES
YES
YES
NO
DOES THE CIRCULATING PUMP RUN?
IS THERE A LIVE SUPPLY TO
r-r-1
REPLACE CIRCULATING PUMP.
TERMINAL10?
NO
REPLACE PUMP OVER-RUN CIRCUIT.
NO
DOES CIRCULATING PUMP RUN?
YES
YES
NO
YES
YES
TURN THE HOT WATER PRIORITY
-----f
DO THE RELAY CONTACTS OPEN?
r--
~
IS THERE A LIVE SUPPLY TO
rrl
REPLACE WATER DIVERTING VALVE.
I
THERMOSTAT FULLY ANTI-
TERMINALS?
CLOCKWISE UNTIL IT CLICKS. TURN
NO
THE ROOM THERMOSTAT. IF FITTED,
NO
TO MAXIMUM. DOES THE WATER
DIVERTING VALVE OPEN'
NO
NO
REPLACE WATER PRIORITY
I
CHECK ROOM THERMOSTATFOR
THERMOSTAT. DOES VALVE OPEN?
CIRCUIT BETWEEN TERMINALS 2 & 3.
YES
YES
YES
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28
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