> ## Documentation Index
> Fetch the complete documentation index at: https://docs.totemdigital.ro/llms.txt
> Use this file to discover all available pages before exploring further.

# ZYT16G timer not working: replacing the AA battery

> Steps to replace the AA battery of the ZYT16G-2a/3a timer when it stops working: releasing it from the rail, swapping the battery, and resetting it.

If the ZYT16G-2a/3a timer stops working or loses the time, replace the AA battery on its back. You need a small flat-head screwdriver and a new AA battery.

<Warning>
  Disconnect the equipment from mains power before you start.
</Warning>

<Steps>
  <Step title="Disconnect the equipment from mains power">
    Turn off the power supply to the equipment.
  </Step>

  <Step title="Open the cover">
    Remove the cover to access the timer.
  </Step>

  <Step title="Release the timer from the rail">
    Insert a small flat-head screwdriver into the bottom of the timer (in the red clip) and gently pull down to release the timer from the rail.
  </Step>

  <Step title="Pull out and turn the timer">
    Once released, gently pull the timer out, as far as the connected wires allow, and turn it to reach the back.
  </Step>

  <Step title="Replace the battery">
    Find the cover over the AA battery and open it. Replace the AA battery (1 pc.).
  </Step>

  <Step title="Reassemble">
    Reassemble in reverse order.
  </Step>

  <Step title="Set up the timer">
    Set the clock and the on/off groups as described in [Programming](/en/timere-electronice/zyt16g/programare).
  </Step>

  <Step title="Power on the equipment">
    Reconnect the equipment to mains power.
  </Step>
</Steps>


## Related topics

- [Programming the ZYT16G timer: clock and on/off groups](/en/timere-electronice/zyt16g/programare.md)
- [Installing and wiring the ZYT16G-2a/3a timer](/en/timere-electronice/zyt16g/instalare-conectare.md)
- [ZYT16G-2a/3a timer: description and technical specifications](/en/timere-electronice/zyt16g/prezentare.md)
- [Electronic timer user manuals by Totem Digital Romania](/en/timere-electronice/prezentare.md)
- [4G routers and LED remote for Totem Digital smart benches](/en/banci-smart/utilizare.md)


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