Baxi Combi 224 Installation And Service Manual page 68

11 Troubleshooting
Group Specific Description
code code
E:02 .21 Jumper 3 changed
E:02 .47 Connection to external device
unsuccessful
E:02 .48 Configuration to external device
unsuccessful
E:04 .00 Gas Valve fault
E:04 .01 Flow temperature sensor short-
circuited
E:04 .02 Flow temperature sensor open-
circuited
E:04 .03 Critical flow temperature
reached
E:04 .04 Flue temperature sensor short-
circuited
E:04 .05 Flue temperature sensor open-
circuited
E:04 .06 Critical flue gas temperature
reached
E:04 .08 Maximum safe temperature
reached (Safety thermostat
open-circuited)
68
Probable cause
Check position of jumper 3
Check wiring to external device
Check pairing to external
Gas valve not detected
Sensor not or badly connected
Bad connection
Sensor fault
Sensor not or badly connected
Bad connection
Sensor fault
Non-existent or insufficient circu­
lation
Sensor not or badly connected
Bad connection
Sensor fault
Sensor not or badly connected
Bad connection
Sensor fault
No circulation
Sensor fault
No circulation
Sensor not or badly connected
Bad connection
Sensor fault
Check/Reason
Put jumper 3 to the off position
Check wiring
Pair the devices
Check the wiring
Check resistance across gas
valve terminals
Replace gas valve if necessary
Check the wiring
Check that the sensors are oper­
ating correctly
Check that the sensor has been
correctly fitted
Replace the sensor if necessary
Check the wiring
Check that the sensors are oper­
ating correctly
Check that the sensor has been
correctly fitted
Replace the sensor if necessary
Check circulation
Check the wiring
Check the sensors are operating
correctly
Check the sensor has been cor­
rectly fitted
Replace the sensor if necessary
Check the wiring
Check the sensors are operating
correctly
Check the sensor has been cor­
rectly fitted
Replace the sensor if necessary
Vent the air in the heating sys­
tem
Check the water pressure
Check the wiring
Check the circulation (direction,
pump, valves)
Check the cleanliness of the
heat exchanger
Check that the sensors are oper­
ating correctly
Check that the sensor has been
correctly fitted
Replace the sensor if necessary
Vent the air in the heating sys­
tem
Check the water pressure
Check the wiring
Check the circulation (direction,
pump, valves)
Check the cleanliness of the
heat exchanger
Check that the sensors are oper­
ating correctly
Check that the sensor has been
correctly fitted
Replace the sensor if necessary
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