A.O. Smith BFC-28 - Displayed Error Code Troubleshooting

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Instruction manual BFC 76
13.3 Troubleshooting table for displayed errors
Displayed errors
Code + description Cause Measure Remark
S01 (blocking error)
Open circuit from
temperature sensor T
2
at the bottom of the
tank.
Sensor is not (correctly)
connected
Connect the sensor lead to JP3 See the electrical diagram (17 "
Appendices").
Damaged cable and/or
defective sensor
Replace the cable and/or sensor. To replace the necessary parts, you must contact your installation
engineer
S02 (blocking error)
Open circuit from
sensor 1 of
temperature sensor T
1
at the top of tank
(1)
.
Sensor is not (correctly)
connected
Connect the sensor lead to JP5 See the electrical diagram (17 "
Appendices").
Damaged cable and/or
defective sensor
Damaged cable and/or defective sensor To replace the necessary parts, you must contact your installation
engineer
S03 (blocking error)
Open circuit in sensor 2
of temperature sensor
T
1
at the top of the tank
(1)
.
Sensor is not (correctly)
connected
Connect the sensor lead to JP5 See the electrical diagram (17 "
Appendices").
Damaged cable and/or
defective sensor
Replace the cable and/or sensor. To replace the necessary parts, you must contact your installation
engineer
S04 (blocking error)
Open circuit from
dummy 1
Dummy is not
(correctly) connected
Connect the dummy sensor (dummy sensor 1 and 2) leads to JP4. See the electrical diagram (17 "
Appendices").
Defective dummy Replace the dummy sensor To replace the necessary parts, you must contact your installation
engineer
S05 (blocking error)
Open circuit from
dummy 2
Dummy is not
(correctly) connected
Connect the dummy sensor (dummy sensor 1 and 2) leads to JP4. See the electrical diagram (17 "
Appendices").
Defective dummy Replace the dummy sensor To replace the necessary parts, you must contact your installation
engineer