Troubleshooting Guide

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Troubleshooting Diagnostic Codes
The display on the dehumidifier will show the diagnostic code and “SERVICE REQUIRED” when the unit is
turned ON. If more than one code is detected, they are displayed consecutively:
E1 - Internal %RH/Temperature Sensor Failure: The User Interface Assembly is not receiving a good
signal from the temperature/RH sensor.
1. If the unit was built before the 21
st
week of 2015 and/or has a user interface board with
Version V2.3 or earlier, determine if the unit is installed in conditions where the potential
for condensation on the sensor board could occur (see note below photos). If the unit
does not have the board with the E1 code change, replace the user interface assembly
(5445).
2. Turn off power to the dehumidifier using the ON/OFF toggle switch. Remove the User
Interface Assembly by first removing the four screws securing it to the housing. Carefully
pull the User Interface Assembly away from the housing and disconnect the three wire
cable from the back of the User Interface Assembly to be able to pull the User Interface
Assembly totally away from the dehumidifier. The small circuit board screwed to the
back of the User Interface Assembly is the sensor board. Replace the RH Sensor board
(5460). If the User Interface has an integrated* RH sensor, replace the User Interface
assembly (5445).
*In December 2017 the RH sensor was integrated into the main User Interface circuit
board. For the first half of 2018, dehumidifiers were produced with User Interface
assemblies with the removable sensor board (5460) and the integrated RH sensor. The
only way to identify is to remove the User Interface or remove the filter access doors to
look for the removable sensor board.
3-wire
connector
Sensor Board