TROUBLESHOOTING
(CONTINUED)
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 .4”w .c .
• Check dehumidifier air filter and wash or replace .
• Check for blocked duct work and clear .
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 .
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,
this is normal .
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