Display shows E20; the unit indicates a communication error between the main body and a detachable wand or tool.

Safety: Power off and unplug the unit.

• Clean contacts: Inspect the electrical contacts at the accessory port and on the wand or powered tool. Clean with a dry cloth and, if needed, a small amount of contact cleaner.
• Check for bent pins: Straighten any slightly bent pins carefully with needle-nose pliers. Do not force the tool into the port.
• Test with another tool: If available, connect a different Stihl accessory. If it works, the original tool may have a failed ID component and should be serviced or replaced.
• Inspect cable: For powered wands, check the cable along its length for cuts or kinks that could break internal conductors.