Dryer displays E17; may be associated with incorrect or unstable mains frequency/voltage.

Safety first: Power circuits can be lethal. If you are not experienced with electrical work, contact a qualified electrician.

• Verify supply: Check that the dryer is connected to the correct voltage and frequency as indicated on the rating plate (e.g., 230 V, 50 Hz). Using a multimeter, confirm voltage at the outlet.
• Avoid extension cords: Plug the dryer directly into a properly grounded wall outlet.
• Inspect power cord and terminal block: With power off, open the rear terminal cover and check for loose screws, burnt wires, or discoloration. Tighten and repair as needed.
• Check power filter / EMI board: Inspect the input filter board for damage or burnt components. Replace if defective.
• Professional diagnosis: If mains supply is correct and connections are sound but E17 persists, the main control board may be misreading frequency and should be replaced by a technician.