Hakko HMI Troubleshooting & Procedures

Step-by-step procedures

• Hakko MONITOUCH — 'Error code received' (NAK) — A Hakko MONITOUCH panel showing 'Error code received' means the PLC replied with a NAK/error — usually because a screen references an out-of-range PLC address. When it fires right at startup, the culprit is a global setting address, not a per-screen one.