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Relay contacts closed

  • Hello,
    I am working in a home automation project that require controlling led strip using both relay and switch in parallels. Led strip require power adapter to convert from 220 V AC input to 12 v 12.5A DC output to power the Led Strip.

    this adapter can be powered either by relay or by separated in switch. so if relay not work switch can do the job.

    when switching both the relay and switch I noticed that relay contacts shut and not return back again when switch off relay. the COM and NO remain contacted.

    do I have to apply a diode to prevent current flow on NO after closing relay.

    I have included the wiring of the circuit.
    thanks in advance for help.!

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