Install Instructions

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.
TABLE 5 – 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. 5460.
Cycle Power
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
E4 Loss of Capacity 1. Cycle power to clear the diagnostic code.
2. Turn the control ON and use the DOWN button to adjust the humidity setting to one (1), then press
MODE and adjust the Vent Time to 60.
3. After the blower starts, press and hold the UP and MODE buttons for three (3) seconds to enter
the diagnostic display. In the diagnostic display, use the UP or DOWN button to cycle between the
air temperature (value and “AIR SAMPLING” displayed), air relative humidity (value and “%RH”
displayed) and the Frost sensor temperature (value only displayed).
4. The air temperature and Frost Sensor temperature should get to within a few degrees of each
other in two to three minutes. If the Frost Sensor temperature is significantly lower than the air
temperature, the Frost Sensor will need to be replaced – Part No. 5455.
5. If the sensor is OK turn up the humidity setting to seven (7) to turn on the compressor. Allow the
compressor to run for 15 minutes and again check the air and Frost Sensor temperatures. The Frost
Sensor temperature should be anywhere from 5°F (VERY hot/humid conditions) to 20°F (cooler/
dryer conditions).
6. Call Technical Support if the Frost Sensor temperature did not get lower.
Cycle Power
E5 High Temperature
Thermistor Failure
1. Remove the side panel to access the electrical service box inside the unit.
2. Remove the cover of the electrical service box.
3. Verify that the “Hi-Temp” sensor connector is seated completely on the circuit board pins.
4. Cycle power and if the diagnostic code does not clear, replace the sensor with Part No. 5456.
Cycle Power
E6 Low Temperature
Thermistor Failure
1. Remove the side panel to access the electrical service box inside the unit.
2. Remove the cover of the electrical service box.
3. Verify that the “Frost” sensor connector is seated completely on the circuit board pins.
4. Cycle power and if the diagnostic code does not clear, replace the sensor with Part No. 5455.
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 ventilator control
board.
4. If the problem persists, replace the float switch.
Self-Correcting
E8 Inlet Air Too Hot or
Cold to Dehumidify
1. This shows on the display only to inform the user. If the air coming into the dehumidifier is colder
than 50°F, or warmer than 104°F, no moisture removal can take place.
2. Check that all ductwork is sealed.
Self-Correcting
90-1854
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