Group
code
Specific
code
Description
Probable cause
Check/Reason
H:01
.18
No circulation of water
Non-existent or insufficient circu
lation
Sensor error
Check circulation
Check water pressure
Check sensors are operating
correctly
Check that the sensor has been
correctly fitted
Check the cleanliness of the
heat exchanger
Check pump
H:01
.21
DHW flow temperature increas
ing too fast
Non-existent or insufficient circu
lation
Sensor error
Check circulation
Check water pressure
Check sensors are operating
correctly
Check that the sensor has been
correctly fitted
Check the cleanliness of the
heat exchanger
H:02
.02
No input of parameters C1/C2
PCB not configured
Input C1/C2
H:02
.03
Incorrect configuration settings
C1/C2
Incorrect C1/C2
Reset C1/C2
H:02
.04
Parameter error
Incorrect parameters
Reset C1/C2
H:02
.06
Low system water pressure
Water leak on boiler
Water leak on system
Check boiler
Check system
Repressurise system
H:03
.00
Communication error with NTC
flue sensor
Sensor not, or badly connected
Bad connection
Sensor fault
Check wiring
Check sensors are operating
correctly
Check that the sensor has been
correctly fitted
Replace the sensor if necessary
H:03
.01
Communication error with the
HMI PCB
HMI not connected
Check wiring
H:03
.02
No flame during operation
No ionization current
Purge gas supply to remove air
Check gas valve is fully opened
Check supply pressure
Check operation and setting of
the gas valve unit
Check air inlet and flue gas dis
charge flues are not blocked
Check that there is no recircula
tion of flue gases
11.3 Fault finding - permanent faults
Tab.29 Permanent fault finding guide
Group
code
Specific
code
Description
Probable cause
Check/Reason
E:00
.04
Return temperature sensor
open-circuit
Sensor not or badly connected
Bad connection
Sensor fault
Check the wiring
Check that the sensors are oper
ating correctly
Check that the sensor has been
correctly fitted
Replace the sensor if necessary
E:00
.05
Return temperature sensor
short-circuit
Sensor not or badly connected
Bad connection
Sensor fault
Check the wiring
Check that the sensors are oper
ating correctly
Check that the sensor has been
correctly fitted
Replace the sensor if necessary
11 Troubleshooting
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Содержание Combi 200
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