E20 displayed, unit may not start or may shut down due to power issues.

Safety first: This involves live electrical circuits. If you are not comfortable with electrical testing, contact a qualified technician. Always turn off power before tightening connections.

Steps:

• Verify supply voltage: Check the nameplate on the Manitowoc unit for required voltage (e.g., 115V or 208–230V). Use a multimeter at the supply terminals to confirm correct voltage.
• Inspect power cord and connections: Look for burned, loose, or discolored wires at the terminal block. Tighten loose screws and replace damaged wiring.
• Check internal fuses: Some models have fuses on the control board or in‑line. Test and replace any blown fuses with the exact type and rating.

Repair: If voltage and wiring are correct but E20 persists, the main control board or power relay may be defective and should be replaced by a technician.