Troubleshooting Guide

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3. If none of the wires have been disconnected, remove the wires connected to the run capacitor.
4. Measure the capacitance of the compressor run capacitor, it should be 45 µF (microfarad) ±5%
for the 70/95pt dehumidifiers and 50 µF (microfarad) ±5% for the 135pt dehumidifier.
Defrost
The defrost feature is in place to protect the dehumidifier from running when the coil is under
conditions where frost and eventually ice could occur on the evaporator. If this were to happen the
dehumidifier would run to hit a set point but no longer have the capacity to remove moisture from the
incoming air, thus running with little potential dehumidification. Defrosting can occur if there is not
enough air going through the dehumidifier or if the temperature and/or %RH of the incoming air is too
low. Verifying the dehumidifier filter is clean or lightly loaded and external static pressure (or airflow of
dehumidifier) is in the acceptable range, will determine if lack of airflow is causing the Defrosting
condition. If Defrosting is occurring because the incoming air conditions are too low, the %RH setting is
too low for the conditions.
A change to the Defrost operation was made with V1.3 on the internal control board. Beginning with
serial number 302015A26313, the dehumidifier will enter Defrost Mode when the suction line has been
at 32°F for 2 hours. This change was implemented to improve capacity at low load conditions (60°F /
60%RH). If a customer has a unit made prior to 302015A26313 that is constantly cycling on Defrost,
replace the Internal Control Board (5444).
E8
The 50° - 104° temperature range is in place to protect the compressor and the 40° dew point is to
protect against inefficient dehumidifier operation. The graph below illustrates how the cost per pint of
an 1830 significantly increases at a 40°F dew point. The addition of heat or dry outside air to these
spaces during times when the incoming air is approximately at a 40° dew point can help reduce the
indoor humidity.
Noise
If noise is not caused by other components such as fan or compressor, check the to verify the screw
holding in the filter drier clip is not contacting the surface is mounted on, especially if in a drain pan.
Units built prior to 082015AXXXXXX have a screw that will contact the mounting surface if the feet of the
dehumidifier are up fully. If this is the case, lower the feet to allow clearance.