Troubleshooting Guide

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and suction line temperature. If the suction line temperature is not within a few
degrees of the inlet air temperature, allow the unit to sit for at least one hour
and then recheck.
If cycled too rapidly, the suction line will not have adequate time to reach room
conditions. After completing system checkout, allow the dehumidifier to sit for
at least 15 minutes before turning it on to the desired operating setting.
E5 or E6 – Temperature Thermistor Failure: The signal from the High Temperature Thermistor (E5) or
Low Temperature Thermistor (E6) is open or shorted. The most likely reason for this code is
a loose connection at the Internal Control board or a failed sensor.
1. Turn the ON/OFF toggle switch OFF. Remove the side panel, insulation and electrical box
cover.
2. Remove the connectors for the “Frost Sensor” and “Hi Temp” and measure the resistance
across the terminals of the connector and make sure it is in the range shown in the table
at the right depending on the temperature in the space.
3. Reinstall the sensor connectors on the Internal Control board and turn ON/OFF toggle
switch ON to reset the code.
E7 – Float Switch Open: The Float Switch input to the User Interface Assembly is open. This will occur if
there is a float switch installed, and there is sufficient water in the secondary drain pan to
cause the float switch to open, or if the installed float switch is faulty or not the appropriate
type (must be a normally open switch that is not powered). If a float switch is not installed,
the jumper in the Float Switch terminals is missing or not properly seated.
Temp (°C)
Temp (°F)
Resistance
(kΩ)
0
32
32.6
10
50
19.8
20
68
12.5
30
86
8.1
40
104
5.3
60
140
2.5