E3
Sharp Humidity Sensor (RH Sensor) Failure

Dehumidifier shows E3 and will not start the compressor; fan may still operate.

Advertisements

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Advertisements

Possible Causes

Failed digital humidity sensor module, disconnected humidity sensor harness, corrosion on sensor connector, failed humidity sensing circuit on main control PCB

How to Fix / Troubleshooting

Safety: Unplug the unit before removing the control panel or covers.

Steps:

  • Power cycle: Unplug for several minutes and restart. If E3 returns, continue.
  • Access control panel: Remove the top/control panel cover to expose the display PCB and wiring harnesses.
  • Locate humidity sensor: On many Sharp dehumidifiers, the humidity sensor is a small plastic module or PCB near the air intake grille, connected by a multi-wire harness to the main or display PCB.
  • Inspect sensor and wiring: Check for dust buildup, moisture damage, or broken wires. Clean light dust with dry compressed air; do not soak the sensor.
  • Reseat connectors: Disconnect and reconnect the humidity sensor plug to ensure a solid connection.
  • Functional check: If you have another identical Sharp unit, you can temporarily swap humidity sensors to confirm the fault. If the error follows the sensor, the sensor is bad.
  • Replace sensor: Install a new humidity sensor module specified for your Sharp model. Mount it in the same location so it samples room air correctly.
  • PCB replacement: If a known-good sensor still gives E3, the main control PCB or display PCB humidity circuit is likely defective and should be replaced as an assembly.

Tip: Avoid spraying cleaners directly into the intake grille; chemicals can damage the humidity sensor.

Advertisements

Repair Difficulty

Medium 3/5

Required Part

Humidity Sensor Module
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements