46
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
WITH THE SYSTEM PRESSURE >1 bar IS
THERE CONTINUITY BETWEEN NO AND C
CONTACTS ON THE WATER PRESSURE
SWITCH
REPLACE FAULTY WATER PRESSURE
SWITCH
NO
IS THERE CONTINUITY BETWEEN THE
PRESSURE SWITCH CONNECTOR AND THE
PCB CONNECTOR
REPAIR OR REPLACE FAULTY
WIRING
YES
YES
REPLACE FAULTY PCB
REPLACE FAULTY
PUMP
REPAIR OR REPLACE
FAULTY WIRING
REPLACE FAULTY PCB
REPLACE FAULTY FAN
REPLACE FAULTY PCB
REPAIR OR REPLACE
FAULTY WIRING
REPLACE FAULTY AIR
PRESSURE SWITCH
REPAIR OR REPLACE
FAULTY FAN
HARNESS
DOES THE PUMP RUN
DOES THE FAN RUN
IS THERE 230 Vac AT THE
PUMP CONNECTION
FREE THE SPINDLE USING
A SCREWDRIVER OR
REPLACE THE PUMP
IS THE FLAME FAILURE LED
ILLUMINATED
REMOVE THE PUMP NUT.
DOES THE IMPELLOR SPIN
FREELY
IS THERE 230 Vac AT THE
PCB CONNECTOR A1
ACROSS PINS 1 AND 2
IS THERE 230 Vac AT THE
FAN CONNECTIONS
IS THE CONTINUITY OF THE
AIR PRESSURE SWITCH
CONNECTING LEAD OK
IS THERE 230 Vac AT THE
PCB FAN CONNECTOR A3
ACROSS PINS 1 AND 2
IS THERE CONTINUITY
BETWEEN NC AND C
CONTACTS ON THE AIR
PRESSURE SWITCH
NO
YES
NO
NO
NO
NO
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
REPLACE FAULTY
OVERHEAT
THERMOSTAT
REPAIR OR REPLACE
FAULTY WIRING
WITH THE BOILER COOL IS
THERE CONTINUITY
ACROSS THE OVERHEAT
THERMOSTAT
IS THE CONTINUITY OF THE
OVERHEAT THERMOSTAT
LEAD OK
NO
YES
PRESS THE RED
RESET BUTTON
NO
YES