Dehumidifier Not Collecting Water

If your dehumidifier is running but not collecting water, the problem could be caused by a dirty air filter, low room humidity, a faulty humidistat, or a failed compressor. Before replacing any parts, inspect the most common causes listed below.

Safety Notice: Always unplug the dehumidifier before servicing it. If you notice electrical damage, burning odors, or refrigerant leaks, discontinue use until the unit has been properly inspected.

Possible Causes

  • Room humidity is too low
  • Dirty or clogged air filter
  • Faulty humidistat
  • Blocked air intake or discharge
  • Dirty evaporator or condenser coils
  • Failed fan motor
  • Failed compressor
  • Refrigerant leak or sealed system issue

1. Room Humidity Is Too Low

Most Common Solution

If the humidity level in the room is already below the dehumidifier's set point, the unit may run but collect little or no water. This is especially common when indoor humidity falls below 40–45%.

What to do:

  • Check the room's humidity level with a hygrometer if available.
  • Set the dehumidifier to a lower humidity setting.
  • Operate the unit in a closed room with doors and windows shut.
  • Allow several hours for normal operation.

2. Dirty or Clogged Air Filter

A dirty air filter restricts airflow across the evaporator coils, reducing the dehumidifier's ability to remove moisture from the air.

What to do:

  • Unplug the dehumidifier.
  • Remove and inspect the air filter.
  • Clean or replace the filter according to the manufacturer's recommendations.
  • Reinstall the filter and test the unit.

3. Humidistat

The humidistat monitors room humidity and tells the dehumidifier when to operate. If it fails, the unit may not remove moisture properly.

What to do:

  • Lower the humidity setting.
  • Verify the humidistat responds to setting changes.
  • Replace the humidistat if it is defective.

4. Blocked Air Intake or Discharge

Restricted airflow can significantly reduce the amount of moisture the dehumidifier removes from the air.

What to do:

  • Make sure nothing is blocking the front or rear air vents.
  • Keep the unit several inches away from walls and furniture.
  • Remove any dust or debris from the air openings.

5. Dirty Evaporator or Condenser Coils

Dust and dirt on the coils reduce heat transfer and lower the unit's ability to condense moisture.

What to do:

  • Disconnect power.
  • Carefully inspect the evaporator and condenser coils.
  • Clean the coils using a soft brush or vacuum.
  • Avoid damaging the delicate coil fins.

6. Fan Motor

The fan motor circulates air through the dehumidifier. If it fails, insufficient air passes over the coils to remove moisture.

What to do:

  • Turn the unit on and verify the fan is operating.
  • Listen for unusual noises.
  • Replace the fan motor if it is defective.

7. Compressor

The compressor circulates refrigerant through the sealed system. If it fails, the coils will not become cold enough to condense moisture.

What to do:

  • Listen for the compressor while the unit is running.
  • Check whether the coils become cool after several minutes.
  • Replace the compressor if it has failed.

8. Refrigerant Leak or Sealed System Issue

Low refrigerant or another sealed system problem can prevent the dehumidifier from removing moisture effectively.

What to do:

  • Inspect the coils for signs of oil residue or damage.
  • If the compressor runs but little or no moisture is collected, the sealed system may require service.
  • Have the refrigerant system professionally diagnosed and repaired.

Need Help Finding the Correct Part?

If you need help identifying the correct replacement part, send us your complete dehumidifier model number and a clear photo of the appliance identification label before placing your order. Our team will verify compatibility and help ensure you receive the correct replacement part the first time.