Dehumidifier shows E7 and stops; may be accompanied by unusual compressor noise or no cooling

Safety warning: The refrigeration circuit is sealed and under pressure. Do not attempt to open or modify it yourself. Always unplug the unit before inspection.

Steps to address E7:

• 1. Basic reset: Unplug for 10 minutes, then reconnect. If E7 reappears quickly, continue.
• 2. Visual inspection: Remove the rear panel to access the compressor and copper tubing. Look for oil stains or corrosion on joints, which may indicate a refrigerant leak.
• 3. Locate the pressure sensor/switch: On models equipped with this feature, it is mounted on the refrigerant line with two or three wires leading to the main PCB.
• 4. Check wiring: Ensure the connector is secure and wires are not damaged or pinched. Reseat the connector.
• 5. Do not bypass: Never short or bypass a pressure switch; it is a safety device.
• 6. Professional service: If wiring is intact and E7 persists, a qualified refrigeration technician must test the pressure sensor and system pressures, check for leaks, and, if necessary, replace the pressure sensor/switch and recharge the system.