TABLE 1
– DIAGNOSTIC CODES
Diagnostic
Code
Failure Mode
Action
Reset
E7
Float Switch Open
1.
Empty the condensate pan�
2.
Check the float switch connection at the control board�
3.
If not using a float switch, verify jumper is between float switch terminals on dehumidifier control
board�
4.
If the problem persists, replace the float switch�
Self-Correcting
E8
Inlet Air
Temperature Out of
50°F – 104°F range,
or dew point below
40°F
1.
If temperature is out of range, no action, normal operation�
2.
If air temperature is between 50°F – 104°F with a dewpoint above 40°F, contact Technical Support�
Self-Correcting
TABLE 2
– 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�7"w�c�
• 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 that there is nothing blocking the inlet or outlet of the dehumidifier�
• 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�
• No action� The compressor will not run if inlet conditions are out of range�
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�
Dehumidifier is
producing hot air�
Normal function�
• Air is reheated across the condenser coil, resulting in a temperature rise between inlet and
outlet�
The HVAC fan turns on
unexpectedly�
Dehumidifier is sampling�
• The dehumidifier will turn on the HVAC fan during air sampling or as needed to meet the
ventilation time�
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