Dehumidifier shows E3 and stops cooling; fan may run but no water is collected.

Safety first: Unplug the unit. The evaporator fins are sharp; wear gloves when working near the coil.

• Power cycle: Unplug for several minutes and restart. If E3 reappears, continue.
• Access the evaporator: Remove the front or rear housing to expose the evaporator coil (the cold aluminum fins). The evaporator sensor is usually clipped to the coil or inserted into a small tube on the coil.
• Inspect sensor and clip: Ensure the sensor probe is firmly attached to the coil and not hanging loose. Re-clip it securely so it makes good thermal contact.
• Check wiring: Trace the sensor wires back to the main control board. Look for chafing, cuts, or pulled connectors. Reseat the connector on the PCB.
• Test sensor (optional): With power off, measure resistance across the sensor leads. Compare to the ambient sensor if they are the same type; a completely open or shorted reading indicates failure.
• Replace sensor: If the sensor is damaged or readings are abnormal, replace the evaporator temperature sensor with a Hisense-compatible part.
• Control board diagnosis: If a known-good sensor still results in E3, the main PCB may have a defective sensor input and should be replaced by a technician.