Window AC won't turn on

Symptoms

• No lights, display, or fan noise at all
• Unit worked before and suddenly stopped
• Breaker trips when trying to start it
• A click but nothing else happens

Likely causes

• CommonReset button tripped or plug not fully seatedMost window units have a small reset button on the plug that trips on a power surge.
• CommonDead or GFCI-tripped outletWindow units are often on outlets near windows that share a GFCI circuit.
• PossibleTripped breaker from an overloaded circuitRunning the AC with other high-draw appliances on the same circuit can trip it.
• PossibleInternal thermal overload switchProtects the compressor after overheating; it may need time to reset itself.
• Less commonFailed capacitor or control boardUnit has power but nothing responds even after all resets.

What to do

1. Unplug the unit, wait 60 seconds, and press the small reset button on the plug head if it has one.
2. Plug it firmly into the outlet; test the outlet with a lamp or phone charger to confirm it has power.
3. Reset any tripped GFCI outlet nearby and check the breaker panel for a tripped breaker.
4. Unplug anything else sharing that circuit and try the AC alone.
5. Let the unit sit unplugged for 10–15 minutes in case a thermal safety needs to cool down, then try again.
6. If it still won't power on with a confirmed good outlet, the issue is likely internal.

Tools and parts

• None (or a lamp/charger to test the outlet)

When to call a pro

Call an electrician if the outlet itself is dead or warm, or an appliance technician if the unit has an internal electrical fault.

Safety