Installation Guide

19 English
Table 1: Diagnostic Codes
Diagnostic
Code Failure Mode Action Reset
E4 Insufficient
Capacity
6. Allow the fan and compressor to run for approximately 10-15
minutes and then enter diagnostic test mode by simultaneously
pressing the s 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
s or t button.
7. Record values and call Technical Support.
Cycle Power
E5 High
Temperature
Thermistor
Failure
Check the high temperature sensor connection at the power board.
The terminal should be fully seated on the power board pins.
Remove the side access panel and verify the sensor is not damaged
and connected to the refrigeration line coming from the compressor.
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
Check the low temperature sensor connection at the power board.
Remove the side access panel and verify the sensor is not
damaged and connected to the suction line.
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
Empty the condensate pan.
Check the float switch connection at the control board.
If not using a float switch, verify jumper is between float switch
terminals on dehumidifier control board.
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. Check for air leakage that might affect the temperature or RH
of the incoming air.
3. If the air temperture is in range and the dew point is above 40°F,
contact Technical Support.
Self-
Correcting
E9 Outdoor
Temperature
Sensor Open or
Shorted
1. Check the sensor connection
at the power board.
2. Remove the wires from the
terminals and measure the
resistance. A short circuit
will have a resistance very
close to 0 Ohms and an
open circuit will have a very
high resistance. Use the
Ohms chart on
page 21 to
approximate the resistance
based on outdoor
temperature.
3. If the sensor is not reading
correctly, replace the sensor,
Part No. 8052.
Outdoor
Temperature Resistance
0°F
84,500
Ohms
20°F
46,000
Ohms
40°F
26,000
Ohms
60°F
15,500
Ohms
80°F 9,500 Ohms
100°F 6,000 Ohms
Self-
Correcting