TABLE 2 – DEHUMIDIFIER DIAGNOSTIC CODES
Diagnostic
Code Failure Mode Action Reset
E2 High
Refrigeration
Pressure
1. Verify that the fan works, the backflow damper
swings freely and there is no blocked or restricted
ductwork.
2. If the fault persists, call Technical Support.
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 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 buttons.
7. Record values and call Technical Support.
Cycle Power
TABLE 2 – DEHUMIDIFIER DIAGNOSTIC CODES
Diagnostic
Code Failure Mode Action Reset
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
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
1514
