Baxi 424 Combi 2 Installation And Service Manual page 75

DISPLAY
DESCRIPTION OF PERMANENT FAULTS (RESET)
Group Specific
code code
E.02 .35 Critical safety device disconnected
Minimum pressure not reached after 6 minutes of
E.02 .39
automatic filling
E.02 .47 Connection to external device unsuccessful
E.04 .01 Flow temperature sensor short circuited
E.04 .02 Flow temperature sensor disconnected
Maximum flow temperature exceeded or flow
E.04 .03
temperature sensor short circuited
E.04 .08 Maximum safe temperature value reached
E.04 .10 Burner failed to ignite after 4 attempts
E.04 .12 Ignition failure for monitoring parasitic flame
E.04 .13 Fan blade blocked or maximum rpm exceeded
E.04 .17 Fault in gas valve control circuit
The flow temperature is below the minimum
E.04 .18
temperature, or the flow temperature sensor is not
connected
E.04 .23 Communication internal stoppage
E.04 .29 Communication internal stoppage
E.04 .254 Fault in gas valve control circuit
CAUSE – Check/Solution
An installer is required for most checks and
solutions.
COMMUNICATION FAULT
Start the auto-detect function (parameter AD)
Check the devices connected to contact X9
AUTOMATIC FILLING ERROR
Check automatic filling is working
ELECTRICAL CONNECTION ERROR
Start the auto-detect function (parameter AD))
Check the electrical connections of external
devices.
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
Check the operation of the sensors
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
(blockages)
Check the ground circuit
Check the power supply voltage
Check the electrode conditions
FAN/PCB PROBLEM
Check the PCB-fan connection
Check the fan operation
MAIN PCB ERROR
Check the electrical connections for the gas valve
SENSOR/CONNECTION PROBLEM
Check the sensor/PCB connection
Check the operation of the sensor
Switch the power supply off and on again and
then RESET
Switch the power supply off and on again and
then RESET
MAIN PCB ERROR
Check the electrical connections
11 Troubleshooting
Combi 2 75