18
B063
IS THE BURNER
ALIGHT?
YES
NO
YES
YES
BOILER
WORKING?
YES
NO
NO
NO
NO
YES
5 - C
HECK
/R
EPLACE
P.C.B. (CBM2)
4 - C
HECK
/R
EPLACE
P.C.B. (CBM2)
4 - C
HECK
/R
EPLACE
P.C.B. (CBM2)
1 - C
HECK
/R
EPLACE IGNITION
ELECTRODES
2 - C
HECK THE CABLES
3 - C
HECK SPARK GENERATOR
4 - C
HECK IGNITION ELECTRODE
CABLES
1 - C
HECK POWER SUPPLY TO
THE GAS VALVE
2 - C
HECK OPERATION OF THE
GAS VALVE
3 - R
EPLACE THE GAS VALVE
1 - C
HECK IF THE FLAME
ELECTRODE
2 - C
HECK THE SOFT
-
LIGHT
GAS PRESSURE
3 - C
HECK
/R
EPLACE DETECTION
ELECTRODE
STRIKES THE DETECTION
P
RESS 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 - C
HECK EXHAUST DISCHARGE
2 - C
HECK VENTURI AND TUBES
3 - C
HECK THE FAN EFFICIENCY
4 - R
EPLACE FAN
1 - C
HECK AIR PRESSURE
SWITCH CABLE
2 - C
HECK
/R
EPLACE AIR
PRESSURE SWITCH
3 - C
HECK
/R
EPLACE
P.C.B.
(CBM2)
B
P
mbar
0.5
P 0.5 mbar
∆
IS
THERE STILL
A PROBLEM?
NORMAL
OPERATION
NORMAL
OPERATION
NO
YES
FAULT LIST
POSSIBLE CAUSES
1
2
3
4
5
N
OISEY OPERATION
N
OISEY OPERATION
D
ECREASE
/
INCREASE OF HEATING CIRCUIT
PRESSURE
D
ECREASE
/
INCREASE OF HEATING CIRCUIT
PRESSURE
R
EPEATED SHUTDOWNS
R
EPEATED SHUTDOWNS
R
EPEATED OPERATION OF SAFETY THERMOSTAT
R
EPEATED OPERATION OF SAFETY THERMOSTAT
I
NSUFFICIENT RADIATOR TEMPERATURE
I
NSUFFICIENT RADIATOR TEMPERATURE
- M
AIN HEAT EXCHANGER FAULTY OR BLOCKED
WITH LIME
-
SCALE DEPOSITS
- L
OW HEATING SYSTEM WATER PRESSURE
- C
HECK GAS PRESSURES
- C
HECK HEATING THERMOSTAT
- C
HECK FAN
- C
HECK PUMP
- M
AIN HEAT EXCHANGER FAULTY OR BLOCKED
WITH LIME
-
SCALE DEPOSITS
- L
OW HEATING SYSTEM WATER PRESSURE
- C
HECK GAS PRESSURES
- C
HECK HEATING THERMOSTAT
- C
HECK FAN
- C
HECK PUMP
- C
HECK FOR LEAKS ON THE HEATING CIRCUIT
- F
AULTY FILLING LOOP
- F
AULTY EXPANSION VESSEL
- C
HECK FOR LEAKS ON THE HEATING CIRCUIT
- F
AULTY FILLING LOOP
- F
AULTY 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
- F
AULTY HEATING THERMOSTAT
- F
AULTY OVERHEAT THERMOSTAT
- P
RESENCE OF AIR IN THE HEATING CIRCUIT
- C
HECK BURNER PRESSURES
- C
HECK EXCHANGER FLUEWAY
- F
AULTY HEATING THERMOSTAT
- F
AULTY OVERHEAT THERMOSTAT
- P
RESENCE OF AIR IN THE HEATING CIRCUIT
- C
HECK BURNER PRESSURES
- C
HECK EXCHANGER FLUEWAY
- C
HECK HEATING THERMOSTAT
- C
HECK BY
-
PASS
- C
HECK GAS PRESSURE
- C
HECK HEATING THERMOSTAT
- C
HECK BY
-
PASS
- C
HECK GAS PRESSURE
∆
≤
∆
FC002Ac