TROUBLESHOOTING
Technical Support is available Monday through Friday, 7:00 a�m� to 5:00 p�m� CST, at (800) 334-6011� Use the guides on the following pages to identify
and correct system faults� Contact Technical Support before replacing the unit or any components and for additional troubleshooting�
DIAGNOSTIC CODES
When an error occurs, the Diagnostic Code along with SERVICE REQUIRED
will be displayed on the control screen�
TABLE 1
– DIAGNOSTIC CODES
Diagnostic
Code
Failure Mode
Action
Reset
E1
Internal Humidity or
Temperature Sensor
Open or Shorted
1.
Check the connection between the sensor board and control board�
2.
If connection okay, replace sensor board, Part No� 5460�
Cycle Power
E2
High Refrigeration
Pressure
1.
Verify that the fan works, and that there is nothing restricting air flow�
2.
If the fault persists, call Technical Support�
Cycle Power
E3
Model 76
Remote Control
Communication Loss
1.
Check connections between Model 76 and dehumidifier control board� Terminals should be fully
inserted and secured in the control board and Model 76 control terminals�
2.
If connections are correct and secure, turn off the dehumidifier and remove the Model 76� Use a short
section of 4-wire cable to reconnect the Model 76 to the control board� Turn the dehumidifier back on
and increase the dryness level setting on the Model 76� If the dehumidifier turns on, the problem is
with the wiring between the dehumidifier and control�
3.
If the dehumidifier does not turn on, call Technical Support�
Self-Correcting
E4
Insufficient Capacity
1.
Check the frost sensor connection at the power board� Terminal should be fully seated on the power
board pins�
2.
Remove the side access panel and verify that the sensor is secured to the suction line�
3.
If the sensor is connected and secured to the refrigeration line proceed to the next step�
4.
Reset the fault by cycling power to the dehumidifier�
5.
Turn the humidity setting down (below room/home humidity level) to make a dehumidification call�
6.
Allow the fan and compressor to run for approximately 10-15 minutes and then enter diagnostic test
mode by simultaneously pressing the
and MODE buttons for 3 seconds� The LCD will display
the temperature measured by the internal sensor while also displaying AIR SAMPLING and ON, the
humidity measured by the internal sensor while also displaying %RH and ON, and the frost sensor
temperature while also displaying ON� Scroll through these values and by using the
and
buttons�
7.
Record values and call Technical Support�
Cycle Power
E5
High Temperature
Thermistor Failure
1.
Check the high temperature sensor connection at the power board� Terminal should be fully seated
on the power board pins�
2.
Remove the side access panel and verify the sensor is not damaged and connected to the
refrigeration line coming from the compressor�
3.
If the sensor is connected and secured to the refrigeration line, it may need to be replaced with Part
No� 5456 — contact Technical Support to confirm�
Cycle Power
E6
Low Temperature
Thermistor Failure
1.
Check the low temperature sensor connection at the power board�
2.
Remove the side access panel and verify the sensor is not damaged and connected to the suction
line�
3.
If the sensor is connected and secured to the refrigeration line, it may need to be replaced with Part
No� 5455 — contact Technical Support to confirm�
Cycle Power
90-1854
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