Dehumidifier will not start; display shows E1 shortly after power-on.

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

• Power reset: Disconnect power for 5–10 minutes, then plug back in. If E1 returns immediately, continue below.
• Access the sensor: Remove the water tank and front grille. On most Klarstein dehumidifiers (e.g., DryFy, Drybest series), the room/ambient NTC sensor is clipped to the evaporator coil or mounted near the air inlet behind the front cover.
• Inspect the NTC sensor: Look for broken wires, crushed insulation, or corrosion at the sensor head. Ensure the sensor is firmly clipped to the coil or bracket.
• Check connectors: Trace the thin sensor wires back to the main control PCB. Reseat the plug by unplugging and firmly reconnecting it. Look for bent pins or oxidation.
• Test resistance (for advanced DIYers): With the unit unplugged, disconnect the sensor from the PCB and measure resistance with a multimeter. At room temperature (~20–25°C), most Klarstein NTCs read between 5–20 kΩ. A reading of 0 Ω (short) or infinite (open) indicates a bad sensor.
• Replace if faulty: If the sensor is open/shorted or physically damaged, replace it with a compatible Klarstein ambient NTC sensor assembly. Route the new sensor wiring along the original path and secure it with cable ties away from the fan.
• If E1 persists: With a known-good sensor installed, a persistent E1 usually indicates a defective main control PCB. Replacement of the PCB is recommended and may require a professional technician.