Dehumidifier stops and displays E1 on the control panel; buttons may be unresponsive.

Safety first: Unplug the dehumidifier from the mains before opening any panels. Wait at least 5 minutes for capacitors on the control board to discharge.

Steps to check and fix:

• Power reset: Unplug the unit for 10 minutes, then plug back in and power on. If E1 clears temporarily and returns, continue below.
• Locate the ambient temperature sensor: On Olimpia Splendid dehumidifiers, the room NTC sensor is usually clipped near the air intake grille or on the evaporator inlet side, connected by two thin wires to the main PCB.
• Inspect wiring: Remove the front or side cover as per the user manual. Check the sensor harness for cuts, pinches, or broken insulation. Ensure the plug is firmly seated on the main control board.
• Check resistance (for advanced users): With the unit unplugged, disconnect the sensor from the board and measure resistance with a multimeter. At around 25°C, most Olimpia Splendid NTC sensors read roughly 5–15 kΩ (exact value varies by model). A reading of 0 Ω (short) or infinite (open) indicates a bad sensor.
• Clean and reseat connectors: If there is light corrosion, clean the connector with contact cleaner, let dry, and reconnect firmly.
• Replace the sensor if faulty: If resistance is out of range or intermittent when you gently flex the cable, replace the ambient NTC temperature sensor with a compatible Olimpia Splendid part.
• Control board check: If a known-good sensor still gives E1, the main control board sensor input may be defective. At this point, replacement of the main PCB is recommended and is best done by a qualified technician.