Baxi 224 Combi 2 Installation And Service Manual page 74

11 Troubleshooting
Tab.33 List of permanent faults (boiler stoppage, reset required)
DISPLAY
DESCRIPTION OF PERMANENT FAULTS (RESET)
Group Specific
code code
E.00 .04 Return temperature sensor disconnected
E.00 .05 Return temperature sensor short circuited
E.00 .16 DHW tank temperature sensor not connected
E.00 .17 DHW tank temperature sensor short-circuited
The flue gas temperature sensor is not connected or
E.00 .20
measured a temperature below the range
The flue gas temperature sensor has short-circuited
E.00 .21
or measured a temperature above the range
E.01 .04 Flame loss detected five times in 24 hours
Temperature measured by return sensor greater than
E.01 .12
flow temperature
E.01 .17 No water circulation (permanent)
E.01 .20 Maximum flue gas temperature reached
Total stoppage of the boiler (antifreeze function not
E.02 .13
active)
E.02 .17 Permanent communication failure in the PCB
74 Combi 2
CAUSE – Check/Solution
An installer is required for most checks and solu­
tions.
SENSOR/CONNECTION PROBLEM
Check the operation of the temperature sensor
Check the sensor/PCB connection
SENSOR/CONNECTION PROBLEM
Check the operation of the sensor
Check the sensor/PCB connection
SENSOR OPEN
Check the operation of the sensor
Check the sensor/PCB connection
When removing a domestic hot water tank, set
parameter DP150=1
SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection
SENSOR OPEN
Check the operation of the sensor
Check the sensor/PCB connection
SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection
GAS SUPPLY
Check the gas supply pressure
Check the gas valve calibration
ELECTRODE PROBLEM
Check the electrode connection and wiring
Check the condition of the electrode
FLUE GAS PIPES
Check the air intake and flue gas exhaust pipes
EXCHANGER ON FLUE GAS SIDE BLOCKED
Check the cleanliness of the exchanger
MAINS VOLTAGE
Check the power supply voltage
SENSOR/CONNECTION PROBLEM
Check that the sensors are positioned the correct
way around
Check that the flow sensor is in the correct posi­
tion Check the return temperature in the boiler
Check the operation of the sensors
INSUFFICIENT CIRCULATION
Check the installation pressure
Activate a manual venting cycle
Check the operation of the pump
Check the boiler/installation circulation
SENSOR ERROR
Check the operation of the temperature sensors
Check the temperature sensor connection
EXCHANGER ON FLUE GAS SIDE BLOCKED
Check the cleanliness of the exchanger
SIGNAL INDICATING BLOCKING INPUT
Contact X15 open, check connected devices
Parameter configuration error: Check setting
AP001
MAIN PCB ERROR
Check for any electromagnetic interference
Contact the Service Network