Baxi 18 System Installation And Service Manual page 73

11 Troubleshooting
SHOWN ON BOILER
DISPLAY
Group Specific
code code
E.04 .08
E.04 .09
E.04 .10
E.04 .11
E.04 .12
E.04 .13
E.04 .14
E.04 .15
E.04 .17
E.04 .18
E.04 .19
E.04 .20
E.04 .21
E.04 .23
E.04 .24
E.04 .54
DESCRIPTION OF PERMANENT FAULTS THAT
REQUIRE RESETTING
Maximum safe temperature value reached
Difference between the temperature values de­
tected by flue gas sensors 1 and 2
Burner failed to ignite after 4 attempts
VPS gas valve test failed
Ignition failure for monitoring parasitic flame
Fan blade blocked
The temperature difference between the set point
and the burner varies more than 60 s compared
to the GVC configuration
Flue gas exhaust pipe blocked
Fault in gas valve control circuit
The flow temperature measured is lower than the
minimum temperature defined by the GVC setting
Mass flow rate sensor communication error
Mass flow rate sensor maximum deviation
Difference detected between the burner 1 and 2
temperature sensors
Gas valve check valve internal stoppage
Gas family not detected during the automatic de­
tection function
Fault in gas valve control circuit
CAUSE
Check / Solution
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
-
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)
-
Check the ground circuit
Check the power supply voltage
FAN/PCB PROBLEM
Check the PCB-fan connection
Replace the air-gas unit
-
-
MAIN PCB ERROR
Replace the main PCB
-
-
-
Not possible
-
Not possible
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.
800 System 2 73