Troubleshooting                                               20 - Aprilaire E080 Installation & Owner's Manual

Technical support is available Monday through Friday 7:00 am
to 5:00 pm CST at 8003346011 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 user interface screen
TABLE 1: DIAGNOSTIC CODES
Diagnostic
Code Failure Mode
Internal Humidity or
E1
Temperature Sensor
Open or Shorted
High Refrigeration
E2
Pressure
Model 76 Remote
E3
Control Communication
Loss
E4
Insufficient Capacity
High Temperature
E5
Thermistor Failure
20
TROUBLESHOOTING
Action
1. Cycle power to clear error code Unplug the unit from the outlet or switch
the ON/OFF power switch (if applicable) to the OFF position for at least 10
seconds before restoring power
2. If error code reoccurs, replace User Interface, Part #5445
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
1. Check connections between Model 76 and dehumidifier user interface.
Terminals should be fully inserted and secured in the user interface 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 user interface. Turn the dehumidifier back on and increase
the dryness level setting on the Model 76. If the dehumidifier turns on, a
problem exists with the wiring between the dehumidifier and control.
3. If the dehumidifier does not turn on, call Technical Support.
1. Check the frost sensor connection at the power board The 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 button for 3 seconds. The LCD will display:
• the temperature measured by the internal sensor while also displaying
the words AIR SAMPLING and ON
• the humidity measured by the internal sensor while also displaying %RH
and the word ON
• the frost sensor temperature while also displaying the word ON
Scroll through these values and by using the
7. Record values and call Technical Support
1. Check the high temperature sensor connection at the power board The
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 #5456 – contact Technical Support to
confirm.
Cycle Power
Cycle Power
Self-Correcting
Cycle Power
button
or button
Cycle Power
Reset