Troubleshooting Guide

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1. Leave the unit ON with the code showing. It will self-correct without having to turn the
unit OFF to reset when the source that initiated the code has been repaired.
2. If a float switch is installed, drain any water out of the secondary drain pan.
3. Remove the Float Switch terminal block from the User Interface Assembly and inspect
the terminal block to ensure the wires are properly seated. If a float switch is installed,
do a continuity check between the float switch terminals – there should be continuity.
Reset/replace the float switch if needed.
4. If a jumper is installed, remove the jumper and reinstall paying particular attention to the
retention of the wire within the terminal.
E8 – Inlet Air Temperature Out of Range: The temperature of the incoming air is less than 50°F or is
higher than 104°F, or the dew point is below 40°F when the compressor is attempting to
start. The most likely cause for this diagnostic code is that the dehumidifier is installed in an
application with temperatures outside of the specification for this product or there are leaks
in the ductwork causing temperature extremes at the dehumidifier inlet. THIS CODE IS SELF-
CORRECTING AND WILL RETURN TO NORMAL OPERATION THE NEXT TIME THE AIR IS
SAMPLED AND IS WITHIN THE ALLOWABLE RANGE. NOTE: This fault will not occur if set to
External Control and Single Zone. If this is event driven (i.e. used for ventilation and the
outdoor air is particularly hot, or used for crawl space dehumidification and the outdoor air is
particularly cold), simply allow the unit to reset itself. To reset the code the before it resets
itself and/or to investigate the cause:
1. Turn the ON/OFF toggle switch OFF and to reset the diagnostic code.
2. Consider the following for the application:
• All installations – If ducting to the HVAC system, make sure the inlet to the
dehumidifier is not ducted to the supply side of the HVAC system.
• Attic installations – Inspect the ductwork attached to the inlet of the dehumidifier
for leaks if the ambient temperature is high.
• Basement installations – Low temperature may be offset by mixing air from the
home into the dehumidifier.
• Crawlspace space applications – The dehumidifier will correct itself when the low
temperature conditions stop.
• Ventilation applications – High or low temperatures may be offset by mixing air
from the home into the dehumidifier.
E9 – Outdoor Temperature Sensor Failure: The signal from the Outdoor Temperature Sensor is out of
range. This will show only if the ventilation feature has been enabled, and temperature limits
have been selected. While this code is self-correcting, it was likely initiated by a problem that
must be fixed. The most likely reason for this diagnostic code is a loose connection at the
User Interface Assembly or a failed sensor.
1. Remove the wiring access cover of the User Interface Assembly located next to the
display.