Dehumidifier beeps and shows E4, unit shuts down shortly after starting

Safety: Unplug the unit before inspection. Do not attempt to open the sealed refrigeration system; that requires a licensed technician.

Steps:

• Check ambient conditions: Ensure the dehumidifier is used within the recommended temperature range (typically 41–95°F / 5–35°C). Move the unit to a warmer, well-ventilated room if it is too cold.
• Inspect airflow: Remove and clean the air filter with mild soap and water, dry completely, and reinstall. Make sure the intake and exhaust grilles are not blocked and that there is at least 12 inches of clearance around the unit.
• Check for overheating: After running for a few minutes (if it will run), feel the sides and back of the unit. Excessive heat may indicate poor airflow or a failing fan.
• Inspect fan operation: With the unit running, verify that the fan is spinning at normal speed and that air is moving strongly from the exhaust. If the fan is slow or not moving, see the fan-related entries in this dataset.
• Compressor temperature sensor: Some Sunbeam models use a clip-on thermal protector or sensor on the compressor shell. With power unplugged, inspect the sensor and wiring for damage or loose connections.
• Reset and test: After cleaning and ensuring proper airflow, unplug the unit for 15–20 minutes to allow the compressor to cool fully. Plug back in and test. If E4 returns quickly, there may be a sealed system or sensor issue.
• When to call a technician: If airflow is good and the fan works but E4 persists, the problem may be a refrigerant charge issue, blocked capillary tube, or defective compressor. These require specialized tools and should be handled by a qualified refrigeration technician.