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Self diagnosis function
E01 ： Temperature sensor (upper compartment temperature sensor for MDF-U537D)
is open circuit
E02 ： Temperature sensor (upper compartment temperature sensor for MDF-U537D)
is short circuit
E03 ： Lower compartment temperature sensor is open circuit （for MDF-U537D only）
E04 ： Lower compartment temperature sensor is short circuit （for MDF-U537D only）
E05 ： Compressor protect sensor is open circuit (for MDF-U537,U537D)
E06 ： Compressor protect sensor is short circuit (for MDF-U537,U537D)
E07 ： Solenoid valve control sensor is open circuit (for MDF-U537 only)
E08 ： Solenoid valve control sensor is short circuit (for MDF-U537 only)
E09 ： Buttery switch OFF with ALARM TEST
E10 ： Compressor temperature is abnormal （for MDF-U537, U537D）
a. Model code setting (for code: 001,002,003)
When temperature sensor is open circuit, display shows alternately E01 with –50℃.
When temperature sensor is short circuit, display shows alternately E02 with +50℃.
b. Model code setting (for code: 002)
When solenoid valve control sensor is open circuit, display shows alternately E07 with
–50℃.
When solenoid valve control sensor is short circuit, display shows alternately E08 with
+50℃.
c. Model code setting (for code: 003)
When TOP lamp is displayed, display shows same as a. in upper compartment.
When BOTTOM lamp is displayed, display shows lower compartment temperature.
When lower compartment temperature sensor is open circuit, display shows alternately
E03 with –50℃.
When lower compartment temperature sensor is short circuit, display shows alternately
E04 with +50℃.
d. Error diagnosis
Self diagnosis of open circuit is done when it is lower than -60℃.
Self diagnosis of short circuit is done when it is higher than +60℃.
E09 is functioned only during ALARM TEST is performed.
In E10 is displayed: When condenser temperature is higher than 85℃, it diagnoses as
abnormal and indicate E10. When condenser temperature is higher
than 100℃ force to turn compressor OFF.
When condenser temperature is lower than 65℃, it diagnoses as
normal and cancel to force compressor turn OFF.
When numbers of error happened simultaneously, error code of smallest number will be
displayed. With exception for MDF-U537D, alternative display of error code and PV,which
is selected compartment internal temperature .
During power failure, display shows alternately E09 with blank.
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