51
DEHUMIDIFIER INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
TROUBLESHOOTING
Table 51-1:
Troubleshooting
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.
• Check demand for dehumidification.
Measured humidity must be greater than control setpoint.
Dehumidifier blower
is running but with
little or no airflow.
Pressure drop across
dehumidifier is too
high.
• Check dehumidifier air filter and replace if necessary.
• 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 – defrost. • Lack of or reduced airflow. Check dehumidifier air filter and replace if necessary.
• Check for blocked duct work.
• Inlet air conditions below 60°F (15.6°C). Increase the humidity setting.
Inlet air temperature
is outside of the
50°F – 104°F (10°C
- 40°C) range or the
dew point is below
36°F (2.2°C) 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.
Troubleshooting
To Next Page
Loading...
