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18
B063
IS THE BURNER
ALIGHT?
YES
NO
YES
YES
BOILER
WORKING?
YES
NO
NO
NO
NO
YES
5-CHECK/REPLACE P.C.B. (CBM2)
4-C
HECK/REPLACE P.C.B. (CBM2)
4 - C
HECK/REPLACE
P.C.B. (CBM2)
1 - C
HECK/REPLACE IGNITION
ELECTRODES
2 - CHECK THE CABLES
3 - CHECK SPARK GENERATOR
4 - CHECK IGNITION ELECTRODE
CABLES
1 - CHECK POWER SUPPLY TO
THE GAS VALVE
2 - CHECK OPERATION OF THE
GAS VALVE
3 - REPLACE THE GAS VALVE
1 - CHECK IF THE FLAME
ELECTRODE
2 - CHECK THE SOFT-LIGHT
GAS PRESSURE
3 - CHECK/REPLACE DETECTION
ELECTRODE
STRIKES THE DETECTION
PRESS THE RESET
BUTTON
IS THE
AIR PRESSURE SWITCH
ACTIVATED?
CHECK
P ON PRESSURE
TEST POINT
DOES
THE SPARK
SEQUENCE
START?
HAS THE
BOILER SAFETY
SHUTDOWN BEEN
ACTIVATED?
1 - CHECK EXHAUST DISCHARGE
2 - CHECK VENTURI AND TUBES
3 - CHECK THE FAN EFFICIENCY
4 - REPLACE FAN
1 - CHECK AIR PRESSURE
SWITCH CABLE
2 - CHECK/REPLACE AIR
PRESSURE SWITCH
3 - CHECK/REPLACE P.C.B.
(CBM2)
B
P mbar0.5
P 0.5 mbar
∆
IS
THERE STILL
A PROBLEM?
NORMAL
OPERATION
NORMAL
OPERATION
NO
YES
FAULT LIST
POSSIBLE CAUSES
1
2
3
4
5
NOISEY OPERATION
NOISEY OPERATION
DECREASE/INCREASE OF HEATING CIRCUIT
PRESSURE
DECREASE/INCREASE OF HEATING CIRCUIT
PRESSURE
REPEATED SHUTDOWNS
REPEATED SHUTDOWNS
REPEATED OPERATION OF SAFETY THERMOSTAT
REPEATED OPERATION OF SAFETY THERMOSTAT
INSUFFICIENT RADIATOR TEMPERATURE
INSUFFICIENT RADIATOR TEMPERATURE
- MAIN HEAT EXCHANGER FAULTY OR BLOCKED
WITH LIME
-SCALE DEPOSITS
- LOW HEATING SYSTEM WATER PRESSURE
- CHECK GAS PRESSURES
- CHECK HEATING THERMOSTAT
- CHECK FAN
- CHECK PUMP
- MAIN HEAT EXCHANGER FAULTY OR BLOCKED
WITH LIME-SCALE DEPOSITS
- LOW HEATING SYSTEM WATER PRESSURE
- CHECK GAS PRESSURES
- CHECK HEATING THERMOSTAT
- CHECK FAN
- CHECK PUMP
- CHECK FOR LEAKS ON THE HEATING CIRCUIT
- FAULTY FILLING LOOP
- FAULTY EXPANSION VESSEL
- CHECK FOR LEAKS ON THE HEATING CIRCUIT
- FAULTY FILLING LOOP
- FAULTY EXPANSION VESSEL
- F
AULTY DETECTION ELECTRODES
- C
HECK GAS PRESSURES
- C
HECK FLAME DETECTION ELECTRICAL CIRCUIT
- F
AULTY DETECTION ELECTRODES
- C
HECK GAS PRESSURES
- C
HECK FLAME DETECTION ELECTRICAL CIRCUIT
- FAULTY HEATING THERMOSTAT
- FAULTY OVERHEAT THERMOSTAT
- PRESENCE OF AIR IN THE HEATING CIRCUIT
- CHECK BURNER PRESSURES
- CHECK EXCHANGER FLUEWAY
- FAULTY HEATING THERMOSTAT
- FAULTY OVERHEAT THERMOSTAT
- PRESENCE OF AIR IN THE HEATING CIRCUIT
- CHECK BURNER PRESSURES
- CHECK EXCHANGER FLUEWAY
- CHECK HEATING THERMOSTAT
- CHECK BY-PASS
- CHECK GAS PRESSURE
- CHECK HEATING THERMOSTAT
- CHECK BY-PASS
- CHECK GAS PRESSURE
∆
≤
∆
FC002Ac