Aprilaire E070 - Troubleshooting; Diagnostic Codes

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� Unplug the unit from the outlet or switch
the ON/OFF Power Switch (if equipped) to the OFF position for at least 10
seconds before restoring power�
2. If error code reoccurs, replace User Interface, Part #5445.
Cycle Power
E2
High Refrigeration
Pressure
1. Verify that the fan works, the backow damper swings freely, and there is
no blocked or restricted ductwork�
2. If the fault persists, call Technical Support�
Cycle Power
E3
Model 76
Remote Control
Communication Loss
1. Check connections between Model 76 and dehumidier 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 dehumidier and
remove the Model 76� Use a short section of 4-wire cable to reconnect the
Model 76 to the user interface. Turn the dehumidier back on and increase
the dryness level setting on the Model 76. If the dehumidier turns on, a
problem exists with the wiring between the dehumidier and control.
3. If the dehumidier does not turn on, call Technical Support.
Self-Correcting
E4 Insufcient Capacity
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 dehumidier.
5. Turn the humidity setting down (below room/home humidity level) to
make a dehumidication call.
6. Allow the fan and compressor to run for approximately 10-15 minutes and
then enter diagnostic test mode by simultaneously pressing the button
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 or button�
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� 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
conrm.
Cycle Power
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 user interface screen�
12 English