E4
Whynter Refrigeration System Protection / High or Low Pressure Fault (Model-dependent)

Dehumidifier shows E4 and does not cool or dehumidify

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Blocked airflow across condenser, Extremely dirty air filter, Refrigerant system issue (low charge or blockage), Faulty pressure switch or sensor

How to Fix / Troubleshooting

Safety first: Unplug the unit before cleaning or inspection. Do not attempt to open sealed refrigeration components.

Steps to resolve E4:

  • Clean the air filter: Remove the intake filter and wash it with mild soap and water. Let it dry completely before reinstalling.
  • Inspect airflow: Check both front and rear grilles for dust buildup or obstructions. Vacuum or brush off any debris.
  • Check placement: Ensure the unit has at least several inches of clearance on all sides and is not pushed against a wall or furniture blocking vents.
  • Power reset: After cleaning, unplug the unit for 10 minutes, then plug it back in and test.

If E4 returns after proper cleaning and ventilation, the issue may be with the sealed refrigeration system or a pressure sensor. These repairs require specialized tools and should be handled by an EPA-certified refrigeration technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Refrigerant Pressure Switch
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