8 Troubleshooting
H.01
.18
No water circulation (temporary).
INSUFFICIENT CIRCULATION
Check the installation pressure
Activate a manual venting cycle
Check the operation of the pump
Check the boiler/installation circulation
TEMPERATURE SENSOR ERROR
Check the operation of the temperature sensors
Check the temperature sensor connection
H.01
.21
Flow temperature increase during domestic hot water
operation too fast.
INSUFFICIENT CIRCULATION
Check the installation pressure
Activate a manual venting cycle
Check the operation of the pump
Check the boiler/installation circulation
TEMPERATURE SENSOR ERROR
Check the operation of the temperature sensors
Check the connection of the temperature sensors
H.02
.00
Reset in progress.
It resolves itself
H.02
.02
Waiting for configuration settings to be entered
(CN1,CN2).
CN1/CN2 CONFIGURATION MISSING
Configure CN1/CN2
H.02
.03
Configuration settings (CN1,CN2) not entered correc
tly.
Check configuration CN1/CN2 Configure
CN1/CN2 correctly
DISPLAY
DESCRIPTION OF TEMPORARY FAULTS
CAUSE – Check/Solution
An installer is required for most checks and solu
tions.
Group
code
Specific
code
H.02
.04
PCB settings cannot be read.
MAIN PCB ERROR
Configure CN1/CN2
Replace the main PCB
H.02
.05
Setting memory not compatible with the boiler PCB ty
pe.
Contact the Service Network
H.02
.07
Low pressure in heating circuit (water filling required).
Check the installation pressure and restore
Check the expansion vessel pressure
Check for boiler/installation leaks
H.02
.09
Partial stoppage of the boiler (antifreeze function acti
ve)
SIGNAL INDICATING BLOCKING INPUT
Contact X15 open, check connected devices
Parameter configuration error: Check AP001
H.02
.10
Total stoppage of the boiler (antifreeze function not
active)
SIGNAL INDICATING BLOCKING INPUT
Contact X15 open, check connected devices
Parameter configuration error: Check AP001
H.02
.70
External unit heat recovery test failed
PCB accessory error SCB-09
Check the device connected to contact X9
H.03
.00
No identification data for boiler safety device.
MAIN PCB ERROR
Contact the Service Network
H.03
.02
Temporary flame loss
ELECTRODE PROBLEM
Check the electrode connection and wiring
Check the condition of the electrode
GAS SUPPLY
Check the gas supply pressure
Check the gas valve calibration
FLUE GAS PIPES
Check the pipes and the terminal
H.03
.05
Power supply voltage too low
Check the mains voltage
H.03
.54
Temporary flame loss
Shutdown due to the power supply voltage being too
low
ELECTRODE PROBLEM
Check the electrode electrical connections
Check the condition of the electrode
GAS SUPPLY
Check the gas inlet pressure
Check the gas valve calibration
FLUE GAS EXHAUST PIPE
Check the air intake and flue gas exhaust termi
nal
Check the power supply voltage
400 Combi 2
21