Install Instructions

TABLE 5 – TROUBLESHOOTING GUIDE
Symptom Possible Reason Troubleshooting Procedure
Dehumidifier does not
turn on/run�
No power to unit� • Check that the dehumidifier is plugged in�
• Check that the power switch is turned ON�
• Check that the control is turned ON�
• Check that the circuit breaker has not tripped�
Dehumidifier blower is
running but with little or
no airflow�
Pressure drop across
dehumidifier is higher
than 0�4"w�c� for Model
E080 or 0�6"w�c� for
Model E100/E100H�
• Check dehumidifier air filter and wash or replace�
• Check for blocked duct work and clear�
• Verify that the outlet collar with backflow damper is installed on the outlet side of the dehumidifier�
• Check if backflow damper is blocked or stuck and remove obstruction�
Dehumidifier blower is
running but compressor
is not�
Float switch open� • If float switch installed, check connections at control board and empty condensate pan�
• If no float switch installed check that the jumper is installed at the float switch terminals on the control
board�
Coil frosting� • Lack of or reduced airflow� Check dehumidifier air filter and wash or replace�
• Check for blocked duct work�
• Inlet air conditions below 60°F� Increase the humidity setting�
Inlet air temperature is
outside of the 50°F –
104°F range or the dew
point is below 40°F and
there is a demand for
dehumidification�
• Verify all ductwork is properly sealed�
When zoned, the
dehumidifier damper
does not open in
INSTALLER TEST mode�
Incorrect damper wiring
or bad connection�
• Verify wiring between dampers and 24 VAC transformer�
• If wired for Two Zone operation, verify that 24 VAC transformer is 40 VA minimum�
• Check all wiring connections between dampers and control board�
• Verify the normally closed dampers are in the Primary Zone ductwork and the normally open dampers
are in the Secondary Zone ductwork�
The ventilation damper
does not open when the
HVAC fan is active�
Cycle time has been
met�
• The damper will not open if the Ventilation Time has already been met�
ODT error or outdoor air
outside of ODT range�
• Check that the ODT is wired correctly to the dehumidifier
control board and connections are secure�
• Check that the ODT is installed in the outdoor air intake
according to the set-up specified in the VENTILATION
section beginning on page 19�
• Remove the ODT leads from the dehumidifier control
board and check the resistance� Compare the reading
with the table shown�
Outdoor
Temperature Resistance
0°F 84,500 Ohms
20°F 46,000 Ohms
40°F 26,000 Ohms
60°F 15,500 Ohms
80°F 9,500 Ohms
100°F 6,000 Ohms
Dehumidifier is not
draining properly�
Drain line blocked or unit
not level�
• Verify that the unit is level�
• Check the drain line blockages and for a continuous downward slope�
• Verify presence and condition of drain cover insert� See MAINTENANCE in Owner’s Manual for cleaning
procedure, or replace with part number 5885 if missing or damaged�
The HVAC fan turns on
unexpectedly�
Dehumidifier is sampling
or ventilation in
progress�
• The dehumidifier will turn on the HVAC fan during air sampling or as needed to meet the ventilation
time�
Dehumidifier is
producing hot air�
Normal function� • Air is reheated across the condenser coil, resulting in a temperature rise between inlet and outlet�
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