A dead or mis-set remote is one of the most common reasons an AC 'stops working'. Start with batteries, the mode and temperature, and a clear line of sight to the indoor unit's sensor. If the remote is fine, the fault may be the indoor unit's IR receiver or control board.
Quick remote checks
Replace the batteries, confirm the mode is Cool and the setpoint is below room temperature, and point the remote directly at the indoor unit from close range. Phone-camera tip: view the remote's IR LED through your phone camera — it should flash when you press a button.
Reset and re-pair
Some remotes need a reset (a pinhole or button) after battery changes, or drift to the wrong protocol. Cheap universal remotes sometimes lose their setting.
When it's the unit, not the remote
If a known-good remote still gets no response, the indoor unit's infrared receiver or control board may have failed — that needs a technician.
How AGM helps
We test the receiver and control board, supply a correctly matched remote, and fix any control fault so the unit responds reliably. Often this is a fast, low-cost visit.
Frequently asked questions
Usually flat batteries, the wrong mode/temperature, or blocked line of sight. If a fresh remote still fails, the unit's IR receiver or control board may be at fault.
Point it at a phone camera and press a button — the IR LED should flash on screen. No flash usually means a remote or battery fault.
Often yes, if set to the correct brand code, but matched remotes are more reliable. AGM can supply and set up the right remote for your unit.
Then the issue is in the unit — power, control board, a tripped safety, or a component fault — and needs a technician to diagnose.