47
BOXER
combination boiler -
Installation and Servicing
FAULT FINDING
F
A
U
L
T FINDING F
A
U
L
T FINDING F
A
U
L
T FINDING F
A
U
L
T FINDING F
A
U
L
T FINDING
NO
YES
DOES THE GAS VALVE OPEN
WITH THE FAN RUNNING
IS THERE CONTINUITY
BETWEEN NO & C
CONTACTS ON THE AIR
PRESSURE SWITCH
REPLACE FAULTY APS
REPLACE FAULTY PCB
IS CONTINUITY OF APS
CONNECTING LEAD OK
IS THERE 132 Vac AT PINS 1
AND 2 AND 47 Vdc AT PINS 3
AND 4 ON THE GAS VALVE
CONNECTING LEAD
REPLACE FAULTY GAS
VALVE
REPAIR OR REPLACE
FAULTY WIRING
REPAIR OR REPLACE
FAULTY GAS VALVE
HARNESS
RECTIFY OR
REPLACE AS
NECESSARY
DOES THE IGNITER OPERATE
(TICKING SOUND)
REPAIR OR REPLACE
FAULTY WIRING
RECTIFY WIRING
FAULT
REPLACE FAULTY PCB
DOES THE BURNER LIGHT
ENSURE THE ELECTRODE
LEAD IS CONNECTED,
UNDAMAGED AND NOT
SHORTED TO EARTH
ENSURE THE ELECTRODE
IS UNDAMAGED AND THE
SPARK GAP IS CORRECT
ARE THE FAN VENTURI
AND FLUE CLEAR OF
OBSTRUCTIONS AND THE
SENSIING PIPES
UNDAMAGED AND
CORRECTLY CONNECTED
IS THERE 132 Vac AT PINS 1
AND 2 AND 47 Vdc AT PINS 3
AND 4 ON THE PCB
CONNECTOR A2
IS THERE 230Vac AT THE
IGNITER CONNECTIONS
IS THERE 230Vac AT THE
PCB CONNECTOR A2
ACROSS PINS 5 AND 6
IS THE SUPPLY POLARITY
TO THE IGNTIER CORRECT
REPLACE FAULTY
IGNITER
IS THERE A SPARK AT THE
IGNITION ELECTRODE
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO