Garage door will not move and control unit display shows E1 immediately after power‑up.

Safety first: Disconnect mains power to the Nice garage door opener at the breaker before opening the housing. High voltage is present on the primary side of the board.

• Check incoming power: Verify the outlet or dedicated circuit feeding the opener has the correct voltage using a multimeter. Reset any tripped breaker or GFCI.
• Inspect main fuse: Open the Nice control unit cover and locate the small glass or cartridge fuse on the PCB. If it appears dark or the filament is broken, test with a continuity meter and replace with the same rating (amperage and slow/fast‑blow type).
• Examine transformer: On many Nice units (e.g., SPIN, ROX, ROBUS, or sectional door kits), a small transformer steps mains down to low voltage. Check for burnt smell, discoloration, or bulging. Measure AC output on the secondary; if there is no output, the transformer is likely faulty.
• Check terminals: Tighten L/N (and PE) screw terminals. Look for heat damage or melted plastic around the connector block.
• Board configuration: Some Nice boards have jumpers or selector switches for 120/230 V. Confirm they match your supply. Incorrect setting can blow the fuse or transformer.
• Restore power and test: After replacing the fuse or transformer and confirming wiring, re‑energize the opener. If E1 reappears immediately and the fuse blows again, disconnect the motor leads and try once more. If the fuse still blows, the control board itself is likely shorted and should be replaced.