TABLE 1
– DIAGNOSTIC CODES
Diagnostic
Code
Failure Mode
Action
Reset
E1
Internal Humidity or
Temperature Sensor
Open or Shorted
1.
Cycle power to clear error code�
2.
If error code reoccurs replace User Interface, Part No� 5738�
Cycle Power
E3
Model A77
Remote Control
Communication Loss
1.
Check connections between Model A77 and dehumidifier control board� Terminals should be fully
inserted and secured in the control board and Model A77 control terminals�
2.
If connections are correct and secure, turn off the dehumidifier and remove the Model A77� Use a
short section of 4-wire cable to reconnect the Model A77 to the control board� Turn the dehumidifier
back on and increase the dryness level setting on the Model A77� 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 UP ARROW 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 UP/
DOWN arrow 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�
Self-Correcting
E7
Float Switch Open
1.
Empty the condensate pan�
2.
Check the float switch connection at the control board�
3.
If not using a float switch, verify jumper is between float switch terminals on dehumidifier control board�
4.
If the problem persists, replace the float switch�
Self-Correcting
E8
Inlet Air Temperature
Out of 50°F – 104°F
range or dew point
below 40°F
1.
Verify all ductwork is properly sealed�
2.
If no signs of leak points, contact Technical Support�
Self-Correcting
TROUBLESHOOTING
Technical Support is available Monday through Friday, 7:00 a�m� to 5:00 p�m� CST, at (800) 972-3710� 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� If a 5818 Alert Light is used, the light will turn on when an error occurs�
90-1854
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