Why does my air conditioner timer not turn the unit off at the time I set?

If the timer does not behave as expected, the issue is often a setting or timing misunderstanding rather than a fault in the appliance. Check whether you set an on-time or off-time, then confirm that the display accepts the chosen interval.

Confirm the timer type

1. Check whether the unit is currently on or off before setting the timer.
2. Set the correct function, because the manuals describe separate timer on and timer off use.
3. Re-enter the desired time slowly and watch for the display to confirm it.

Expected result

The unit should follow the chosen timer period within the supported range. If it does not, the setting may not have been stored properly.

Check for conflicting settings

1. Cancel any previous timer first.
2. Make sure the current mode, temperature and timer do not conflict with each other.
3. Test a short timer period so you can see whether the unit responds.

When to stop using it

Stop using the air conditioner if the timer issue is accompanied by erratic behaviour, a burning smell or display failure. If the timer still does not work after a careful reset and re-entry, contact the retailer or store where it was purchased.