Instruction Manual

TABLE 2 – 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. 71000038.
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. 71000035 – 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. 71000034 – 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 [phone]. 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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