Baxi 224 Combi 2 Installation And Service Manual page 76

11 Troubleshooting
Tab.34 List of warnings
DISPLAY
DESCRIPTION OF WARNINGS BEFORE A FAULT
Group Specific
IS DETECTED
code code
Solar temperature sensor is either removed or
A.00 .28
measures a temperature below range
Solar temperature sensor is either shorted or
A.00 .29
measures a temperature above range
Outdoor temperature sensor expected but not detec­
A.00 .34
ted
A.02 .06 Low pressure in heating circuit
A.02 .36 Functional device disconnected
A.02 .37 Passive functional device disconnected
A.02 .45 Connection error
A.02 .46 Device priority error
A.02 .48 Unit function configuration error
A.02 .49 Failed node initialisation
A.02 .54 Open Therm bus power supply error
A.02 .55 Incorrect or missing serial number
Internal memory reserved for full customisation of set­
A.02 .76 tings.
No further changes can be made
76 Combi 2
CAUSE – Check/Solution
Check the solar temperature sensor wiring. Re­
place the sensor if necessary. In case of removal
of the solar tank, set the parameter DP150=1.
Check the solar temperature sensor wiring. Re­
place the sensor if necessary.
OUTDOOR SENSOR NOT DETECTED
Enter the correct value of the parameter AP091
Connect the outdoor sensor
Outdoor sensor is not connected correctly
Check the installation pressure and restore
Check the expansion vessel pressure
Check for boiler/installation leaks
COMMUNICATION FAULT
Start the auto-detect function (parameter AD)
Check the devices connected to contact X9
COMMUNICATION FAULT
Start the auto-detect function (parameter AD)
Check the devices connected to contact X9
COMMUNICATION FAULT
Start the auto-detect function (parameter AD))
COMMUNICATION FAULT
Start the auto-detect function (parameter AD))
ELECTRICAL CONNECTION ERROR
Start the auto-detect function (parameter AD))
Check electrical connections of external devices
ELECTRICAL CONNECTION ERROR
Start the auto-detect function (parameter AD))
Check electrical connections of external devices
Check the devices connected to contact X17 -
Terminal board M2 (7-8)
Contact the Service Network
Contact the Service Network
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.