Dehumidifier will not start and displays E1 on the control panel

Safety first: Unplug the Inventor dehumidifier from the wall outlet before removing any covers. Do not work on the unit while it is connected to power.

• Power reset: Unplug the unit for 5–10 minutes, then plug it back in and try to start it again. Sometimes E1 can be a temporary sensor reading error.
• Check ambient sensor location: On most Inventor dehumidifiers, the room temperature NTC sensor is clipped near the air intake grille or on the evaporator inlet pipe. Remove the front or side panel (usually a few Phillips screws) and locate the small probe with two thin wires going to the main PCB.
• Inspect wiring and connector: Verify the sensor wires are not cut, pinched, or pulled out of the connector. Reseat the connector on the main PCB by unplugging and plugging it back in. Look for corrosion or burnt marks.
• Measure sensor resistance (for advanced DIYers): With the unit unplugged, disconnect the sensor from the PCB and measure resistance across the two sensor leads using a multimeter. At around 25°C (77°F), most Inventor NTC sensors read roughly 5–15 kΩ (exact value depends on model). If the reading is open (infinite) or near 0 Ω, the sensor is defective.
• Replace the ambient NTC sensor: If the sensor is faulty, order a compatible Inventor ambient NTC temperature sensor for your exact model. Clip the new sensor in the same position, route the wires as originally, and connect it to the PCB.
• Suspect main PCB: If the sensor tests good and wiring is intact but E1 persists, the main control PCB’s sensor input may be defective. In that case, replacement of the main control PCB is usually required and is best done by a qualified technician.