Dehumidifier shows E3 and will not run the compressor

Safety: Unplug the unit before opening the housing. Do not spray liquids directly into the control panel area.

Steps:

• Power cycle: Unplug for 5–10 minutes and reconnect. If E3 persists, continue.
• Locate humidity sensor: On many Russell Hobbs dehumidifiers, the humidity sensor is mounted behind the front grille or near the air intake, often on a small daughter board connected to the main PCB by a ribbon or 3–5 wire harness.
• Inspect for contamination: Remove the front grille and visually inspect the sensor. Look for heavy dust, lint, or signs of water damage.
• Clean the sensor area: Use a soft brush and dry compressed air to gently clean dust from the sensor and surrounding area. Do not use water or aggressive cleaners.
• Check connections: Ensure the sensor plug is fully seated on the main PCB. Look for bent pins or corrosion.
• Replace sensor module: If E3 remains, replace the Russell Hobbs humidity sensor module or sensor board with the correct part for your model. Transfer any mounting clips or brackets from the old sensor.
• PCB suspicion: If a new sensor does not resolve E3, the main control PCB may be defective and require replacement by a technician.