A.O. Smith BFC Cyclone 28 Installation, User And Service Manual page 92

Code and description
S02 (blocking error)
Open circuit from sensor 1
of temperature sensor T
1
at the top of tank
(1).
S03 (blocking error)
Open circuit in sensor 2 of
temperature sensor T at
1
the top of the tank .
(1)
S04 (blocking error)
Open circuit from
dummy 1.
S05 (blocking error)
Open circuit from
dummy 2
S11 (blocking error)
Short circuit in
temperature sensor T at
2
the bottom of the tank.
S12 (blocking error)
Short circuit in sensor 1 of
temperature sensor T at
1
top of tank
(1)
S13 (blocking error)
Short circuit in sensor 2 of
temperature sensor T at
1
the top of the tank .
(1)
S14 (blocking error)
Short circuit from
dummy 1
S15 (blocking error)
Short circuit from
dummy 2
F01 (blocking error)
Defect in power supply
circuit
92
Cause
Sensor is not (correctly) connected
Damaged cable and/or defective sensor
Sensor is not (correctly) connected
Damaged cable and/or defective sensor
Dummy is not (correctly) connected
Defective dummy
Dummy is not (correctly) connected
Defective dummy
Short circuit in sensor circuit
Short circuit in sensor circuit
Short circuit in sensor circuit
Short circuit in sensor circuit
Short circuit in sensor circuit
Live and neutral connected wrong way
around.
Condensation on the flame probe
Floating neutral
Measure
Connect the sensor lead to JP5
Replace the cable and/or sensor
Connect the sensor lead to JP5
Replace the cable and/or sensor
Connect the dummy sensor (dummy sensor
1 and 2) leads to JP4.
Replace the dummy sensor
Connect the dummy sensor (dummy sensor
1 and 2) leads to JP4.
Replace the dummy sensor
Replace the cable and/or sensor.
Replace the cable and/or sensor.
Replace the cable and/or sensor.
Replace the cable dummy sensor
Replace the cable dummy sensor
Be sure to connect the live and neutral
correctly (see section 7.7); the water heater
is phase-sensitive
• Disconnect the lead at the flame probe
• Ignite the water heater three times, with
an interrupted ionisation circuit
• Reconnect the ionisation lead to the
flame probe
• Ignite the water heater again
• The repeated ignition attempts will have
caused the condensation to evaporate
Install an isolating transformer (see section
7.7.3.1)
Installation, Maintenance and Service part
.
(2)
.
(2)