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XI.
Fault Diagnosis
Fault
Possible Reasons
Door Open
· Damage to door switch
· The door was not fastened
Power Supply
· Power input does not meet the requirements
Failure
· Main switch of the power supply is not on
· Power failure
Low Battery
· Disconnected battery switch
· Low battery
Abnormal
· Disconnection of line
Chamber TEMP
· Chamber temperature sensor is damaged
Abnormal HEX
· Disconnection of line
TEMP
· Damaged heat exchanger temperature
sensor
Abnormal COND
· Disconnection of line
TEMP
· Condenser temperature is too high
· Condenser temperature sensor is damaged
· Dust accumulated in the filter of the
condenser
1st Stage
· 1st stage pressure is too high
Pressure Switch
· Disconnection of line
Not Closed
2nd Stage
· 2nd stage pressure is too high
Pressure Switch
· Disconnection of line
Not Closed
High TEMP
· Actual chamber temperature is larger than
the pre-set allowable temperature range.
Low TEMP
· The actual chamber temperature is less than
the pre-set allowable deviation temperature.
Version 1.0
User Manual
Solution
· Replace the door switch
· Close the door and handle
· Check the power supply is normal
· Set battery switch for charging
· Check for detached or loose wiring
· Replace the temperature sensor
· Check for detached or loose wiring
· Replace the temperature sensor
· Check for detached or loose wiring
· Improve the ambient temperature
· Replace the temperature sensor
· Clean the filter
· Wait for 1st stage pressure to drop
· Check for detached or loose wiring
· Wait for 2nd stage pressure to drop
· Check for detached or loose wiring
· Check if the high temperature
Alarm value is too low
· Check if the low temperature alarm
Value is too low.
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