Display shows Err or Error and the microwave will not accept input or start.

Safety: This is typically an electronic control issue; internal high-voltage components are not usually involved.

Steps:

• 1. Clear program: Press Stop/Cancel to clear any active program. Try entering a simple cook time (e.g., 30 seconds) and press Start.
• 2. Hard reset: Unplug the Tower microwave for 15 minutes, then plug back in. This can clear minor firmware errors.
• 3. Check power quality: Avoid using extension leads or overloaded multi-sockets. Plug directly into a properly grounded outlet.
• 4. Observe pattern: If Err appears only with certain functions (e.g., grill or combination), the control board may have a partial failure.

Resolution: Persistent Err messages usually require replacement of the main control PCB. Have a technician confirm before ordering parts.