A.O. Smith Innovo 12-160 Installation, Service & Maintenance Manual page 79

Code and description
S02 (blocking error)
Sensor error
Open circuit from sensor 1
of the temperature sensor
S03 (blocking error)
Sensor error
Open circuit from sensor 2
of the temperature sensor
S12 (blocking error)
Sensor error
Short circuit in sensor 1 of
the temperature sensor
S13 (blocking error)
Sensor error
Short circuit in sensor 2 of
the temperature sensor
0312266_INNOVO_UKUK_V3.0, 2017-02-10
Cause
Sensor is not (correctly) connected.
Damaged wiring and/or defective
sensor.
Sensor is not (correctly) connected.
Damaged wiring and/or defective
sensor.
Short circuit in the sensor circuit.
Short circuit in the sensor circuit.
Measure
• Make sure that the connector is
connected to J3.
• Make sure that the wire is connected to
the sensor.
Replace the wiring and/or sensor.
• Make sure that the connector is
connected to J3.
• Make sure that the wire is connected to
the sensor.
Replace the wiring and/or sensor.
Replace the wiring and/or sensor.
Replace the wiring and/or sensor.
79