Check the handset first
Fit the correct fresh batteries in the stated orientation and inspect the battery contacts without using metal tools. Confirm that the display is clear and remove any shipping tab or child lock in accordance with the user manual.
Stand within the stated range, point the remote toward the indoor receiver and clear objects that may block the signal. Bright direct light can affect some receivers. Do not assume a phone-camera test proves every infrared remote is healthy.
Check the system response
Look for power or status indicators on the indoor unit and check whether a wired controller, app or another approved remote operates it. If the entire system is unpowered, the problem is wider than the handset.
Some remotes need their time or address reset after battery replacement, especially on multi-unit installations. Follow the exact manufacturer instructions rather than trying unrelated online button combinations.
When replacement or repair is needed
A damaged handset may be replaceable, but compatibility matters. The same brand name does not guarantee that every remote supports the model and all functions. A receiver, control board or power fault requires technical diagnosis.
Give Top Local the indoor-unit model and remote part number, plus photos of the display. That helps identify whether the next step is correct setup, a compatible controller or an on-site system check.