8 Troubleshooting
DISPLAY
DESCRIPTION OF PERMANENT FAULTS (RESET)
CAUSE – Check/Solution
An installer is required for most checks and solu
tions.
Group
code
Specific
code
E.04 .03
Maximum flow temperature exceeded or flow tempe
rature sensor short circuited
INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
Check the operation of the sensors
E.04 .08 Maximum safe temperature value reached
INSUFFICIENT CIRCULATION
Check the pressure in the installation
Switch on the manual degassing function
Check that the pump is working
Check the circulation in the boiler/installation
OTHER POSSIBLE CAUSES
Check the safety thermostat connection
Check that the safety thermostat is working cor
rectly
E.04 .10 Burner failed to ignite after 4 attempts
GAS SUPPLY
Check the gas supply pressure
Check the gas valve electrical connection
Check the gas valve calibration
Check the operation of the gas valve
ELECTRODE PROBLEM
Check the electrode electrical connections
Check the electrode condition
OTHER CAUSES
Check the operation of the fan
Check the condition of the flue gas exhaust (bloc
kages)
E.04 .12 Ignition failure for monitoring parasitic flame
Check the ground circuit
Check the power supply voltage
Check the electrode conditions
E.04 .13 Fan blade blocked or maximum rpm exceeded
FAN/PCB PROBLEM
Check the PCB-fan connection
Check the fan operation
E.04 .17 Fault in gas valve control circuit
MAIN PCB ERROR
Check the electrical connections for the gas valve
E.04 .18
The flow temperature is below the minimum tempera
ture or the flow temperature sensor is not connected
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
E.04 .23 Communication internal stoppage
Switch the power supply off and on again and
then RESET
E.04 .29 Communication internal stoppage Switch the power supply off and on again and
then RESET
E.04 .254 Fault in gas valve control circuit
MAIN PCB ERROR
Check the electrical connections
E.
02 .35 Critical safety device disconnected
COMMUNICATION FAULT
Start the auto-detect function (parameter AD)
Check the devices connected to contact X9
E.02 .39
Minimum pressure not reached after 6 minutes of au
tomatic filling
AUTOMATIC FILLING ERROR
Check automatic filling is working
E.02 .47 Connection to external device unsuccessful
ELECTRICAL CONNECTION ERROR
Start the auto-detect function (parameter AD)
)
Check the electrical connections of external devi
ces.
E.04 .01 Flow temperature sensor short circuited
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
E.04 .02 Flow temperature sensor disconnected
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
400 Combi 2 23
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