SHOWN ON BOILER
DISPLAY
DESCRIPTION OF PERMANENT FAULTS THAT
REQUIRE RESETTING
CAUSE
Check / Solution
Group
code
Specific
code
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 correctly
E.04 .09
Difference between the temperature values de
tected by flue gas sensors 1 and 2
-
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 (block
ages)
E.04 .11 VPS gas valve test failed -
E.04 .12 Ignition failure for monitoring parasitic flame
Check the ground circuit
Check the power supply voltage
E.04 .13 Fan blade blocked
FAN/PCB PROBLEM
Check the PCB-fan connection
Replace the air-gas unit
E.04 .14
The temperature difference between the set point
and the burner varies more than 60 s compared
to the GVC configuration
-
E.04 .15 Flue gas exhaust pipe blocked -
E.04 .17 Fault in gas valve control circuit
MAIN PCB ERROR
Replace the main PCB
E.04 .18
The flow temperature measured is lower than the
minimum temperature defined by the GVC setting
-
E.04 .19 Mass flow rate sensor communication error -
E.04 .20 Mass flow rate sensor maximum deviation -
E.04 .21
Difference detected between the burner 1 and 2
temperature sensors
Not possible
E.04 .23 Gas valve check valve internal stoppage -
E.04 .24
Gas family not detected during the automatic de
tection function
Not possible
E.04 .54 Fault in gas valve control circuit
Check the wiring on the gas valve
Replace the gas valve or PCB
Important
When connecting a Room Unit/Control Unit to the boiler, the code
“254” is always shown in the event of a fault.. Read the fault code
shown on the boiler display.
11 Troubleshooting
76 600 Combi 2
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