Troubleshooting Guide

3 | Page
NOTE E1 Code Change: Beginning with serial number 212015A16241 the code was changed to V2.4. E1
and E8 will no longer occur when in External & Single Zone Mode. When in this mode combination, the
dehumidifier will not check the inlet air condition and will not use the on board sensor board to sample
the indoor temperature or humidity. This change is to eliminate issues in geographic regions where the
dehumidifier is installed with external control, in an environment that has periods of cold temperatures
and there is still a dehumidification demand. Condensation can form on the sensor board and sensors,
causing an E1 fault.
E2 – High Refrigeration Pressure: The temperature of the discharge line exceeds 190°F. This is self-
correcting unless it occurs for five consecutive compressor starts. This is usually caused by
the inlet air temperature being too high (i.e. greater than 100°F), or very low airflow through
the dehumidifier.
1. Turn the ON/OFF toggle switch OFF to reset the diagnostic code.
2. If the fan is not working, see “Fan does not Function” section on page 15.
3. Consider the following for the application:
1. If ducting to the HVAC system, make sure the inlet to the dehumidifier is not ducted
to the supply side of the HVAC system.
2. Attic installations – Inspect the ductwork attached to the inlet of the dehumidifier for
leaks if the ambient temperature is high.
3. Ventilation applications – High temperatures may be offset by mixing air from the
home into the dehumidifier.
E3 – Model 76 Remote Control Communication Loss: A Model 76 control, wired to the Remote
terminals of the User Interface Assembly, had communication, but has now stopped
communicating.
Note: For E3 to be displayed, the method of control had to have been set up for a Remote
control. This is done by selecting Remote Enabled in the set-up menu.
Note: Version 2.5 of the User Interface firmware includes a fix to a bug that may be noticed
by customers and would result in the customer seeing “E3” and then having the problem go
away only to appear again later.
Integrated
RH Sensor