Dehumidifier will not run and displays E1 on the control panel

Safety first: Unplug the dehumidifier before removing any panels. Do not work on the unit while it is connected to power.

Steps to check and address E1:

• Power reset: Unplug the unit for 5–10 minutes, then plug back in and try again. Sometimes E1 is a temporary sensor read error.
• Locate the ambient temperature sensor: On most Black+Decker dehumidifiers, the room temperature sensor (NTC thermistor) is clipped near the air intake grille or on the evaporator coil bracket, connected by two small wires to the main control board.
• Inspect the wiring: Remove the front or rear cover as needed. Look for a small probe or bead-type sensor with two wires. Check for broken, pinched, or chewed wires and loose or corroded connectors. Reseat the connector firmly on the control board.
• Check sensor resistance (if you have a multimeter): With the unit unplugged, disconnect the sensor from the board. Measure resistance across the two sensor leads. At room temperature (around 20–25°C / 68–77°F), most NTC sensors should read between 5 kΩ and 50 kΩ. A reading of 0 Ω (short) or infinite (open) indicates a bad sensor.
• Replace the sensor if faulty: Order a compatible ambient temperature sensor (NTC) for your exact Black+Decker model. Clip or screw the new sensor in the same location and route the wires as originally installed. Plug the connector back into the main PCB.
• If E1 persists: If the sensor tests good and wiring is intact, the main control board’s sensor circuit may be defective. At this point, replacement of the main control board is recommended and is best done by a qualified technician.