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Sanyo MDF-U500VX Service Manual page 46

Ultra-low temperature freezer
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Error 01~08 (Abnormal in sensor)
LCD indication
Error 01 Temperature Sensor is Open
Error 02 Temperature Sensor is Short
Error 03 Condenser Sensor A is Open
Error 04 Condenser Sensor A is Short
Error 05 Condenser Sensor B is Open
Error 06 Condenser Sensor B is Short
Error 07 AT Sensor is Open
Error 08 AT Sensor is Short
Symptom/Diagnosis
Temp. sensor is open circuited
Diagnosis: More than 1189
Temp. sensor is short circuited
Diagnosis: Less than 450.8
Comp. sensor A is open circuited
Diagnosis: More than 154.5
Comp. sensor A is short circuited
Diagnosis: Less than 0.413
Comp. sensor B is open circuited
Diagnosis: More than 154.5
Comp. sensor B is short circuited
Diagnosis: Less than 0.413
AT sensor is open circuited
Diagnosis: More than 154.5
AT sensor is short circuited
Diagnosis: Less than 2.13
Check connections of connectors/lead wires in temp. sensor
If resistance for temp. sensor is more than 1189 , replace the sensor.
Check connections of connectors/lead wires in temp. sensor
If resistance for temp. sensor is less than 450.8 , replace the sensor.
Check connections of connectors/lead wires in comp. sensor A.
If resistance for comp. sensor A is more than 154.5 , replace the sensor.
Check connections of connectors/lead wires in comp. sensor A.
If resistance for comp. sensor A is less than 0.413 , replace the sensor.
Check connections of connectors/lead wires in comp. sensor B.
If resistance for comp. sensor B is more than 154.5 , replace the sensor.
Check connections of connectors/lead wires in comp. sensor B.
If resistance for comp. sensor B is less than 0.413 , replace the sensor.
Check connections of connectors/lead wires in AT sensor.
If resistance for AT sensor is more than 154.5 , replace the sensor.
Check connections of connectors/lead wires in AT sensor.
If resistance for AT sensor is less than 2.13 , replace the sensor.
Check points:
(1) Check if connector(s) is loosen or disconnected.
(2) Check if lead wire(s) is disconnected, open circuited, scratched.
Remedy
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