What causes fault code SAFE-MAGSW1 (Magnetic Safety Switch — Door Not Detected)?

Door or gate has sagged — magnet and switch no longer aligned. Magnet has weakened or shifted in its mounting — no longer in sensing range. Switch sensing gap too large — switch requires very close proximity (typically <15mm). Switch has been tampered with — magnet taped to the switch to bypass the door. Switch wiring disconnected — cable cut or terminal loose

How do I fix fault code SAFE-MAGSW1?

Check door/gate alignment — verify the magnet passes within the switch's rated sensing range when closed. Measure the gap between magnet and switch with the door closed — adjust mounting to achieve required gap. Check for tampering — there should NOT be a magnet taped or mounted permanently on the switch body. Verify switch operation — close the door and check the PLC input LED changes state. Check switch wiring — trace cable from switch to safety relay or PLC safety input. Replace switch if it does not respond even with the magnet at minimum gap — internal reed or Hall effect element may have failed

Magnetic Safety Switch — Door Not Detected

SAFE-MAGSW1

Coded magnetic safety switch is not detecting the door-mounted magnet. Guard door appears closed but the safety switch does not confirm the closed position.

high general conveyor packaging

safety magnetic switch guard door magnet sensing tamper

Probable Causes (ranked)

Door or gate has sagged — magnet and switch no longer aligned
Magnet has weakened or shifted in its mounting — no longer in sensing range
Switch sensing gap too large — switch requires very close proximity (typically <15mm)
Switch has been tampered with — magnet taped to the switch to bypass the door
Switch wiring disconnected — cable cut or terminal loose

Fix Steps

1 Check door/gate alignment — verify the magnet passes within the switch's rated sensing range when closed
2 Measure the gap between magnet and switch with the door closed — adjust mounting to achieve required gap
3 Check for tampering — there should NOT be a magnet taped or mounted permanently on the switch body
4 Verify switch operation — close the door and check the PLC input LED changes state
5 Check switch wiring — trace cable from switch to safety relay or PLC safety input
6 Replace switch if it does not respond even with the magnet at minimum gap — internal reed or Hall effect element may have failed

Field Trick

Coded magnetic switches use a specific magnet pattern to prevent bypass with a random magnet. If you replace the switch, you MUST use the matching magnet — a standard magnet from the hardware store won't work. Always keep matched pairs (switch + magnet) in your spare parts stock.

Need a deeper diagnosis with photo analysis and AI-powered troubleshooting?

Run Full Diagnosis