If your TCL window air conditioner will not turn on or the display remains blank, follow the steps below in order. These checks can help determine whether the problem is with the outlet, power cord, safety plug, or air conditioner.

Before You Begin

Stop using the air conditioner and unplug it immediately if:

• The power cord or plug is damaged or unusually hot.
• You notice sparks or a burning smell.
• The outlet or circuit breaker repeatedly trips.

Do not attempt to repair a damaged power cord or safety plug.

Step 1: Check the Power Connection

• Make sure the air conditioner’s plug is fully inserted into the wall outlet.
• Connect the air conditioner directly to the outlet.
• Do not use a power strip, surge protector, smart plug, or extension cord.

Why this is important: Air conditioners require more power than many household devices. An unsuitable power accessory may overheat or prevent the unit from receiving enough power.

Step 2: Test the Wall Outlet

• Unplug the air conditioner.
• Connect a small device, such as a lamp or phone charger, to the same outlet.
• If the device does not work, try resetting the outlet if it has a RESET button.
• If the device works, continue to the next step.

Why this is important: This confirms whether electricity is reaching the wall outlet.

Step 3: Check the Circuit Breaker or Fuse

• Check your home’s electrical panel for a tripped circuit breaker or blown fuse.
• Reset a tripped breaker only once, then try turning on the air conditioner.
• If the breaker trips again, unplug the air conditioner and contact a qualified electrician.

Why this is important: A tripped breaker or blown fuse interrupts power. Repeated tripping may indicate an electrical problem that requires professional service.

Step 4: Test the Safety Plug

Many TCL window air conditioners have TEST and RESET buttons on the power plug.

• Plug the air conditioner directly into the wall outlet.
• Press the RESET button firmly.
• Press TEST. The plug should trip, and the RESET button should release.
• Press RESET again before attempting to turn on the air conditioner.

If the plug does not respond, will not reset, or immediately trips again, unplug the air conditioner and stop using it.

Why this is important: The safety plug is designed to interrupt power when it detects a potentially unsafe electrical condition.

Step 5: Reset the Air Conditioner

• Unplug the air conditioner for five minutes.
• Plug it directly into the working wall outlet.
• Press RESET on the safety plug, if present.
• Press the Power button on the air conditioner.

Why this is important: Disconnecting the unit from power can clear a temporary control-panel or electrical error.

Step 6: Check for a Compressor Delay

If the display turns on but the air conditioner does not immediately begin cooling:

• Select Cool mode.
• Set the temperature below the current room temperature.
• Wait at least three minutes.

Why this is important: The compressor may delay starting for approximately three minutes to protect the cooling system. This is normal and is different from a complete no-power condition.

If the Air Conditioner Still Does Not Turn On

Contact TCL Support if:

• The outlet works, but the air conditioner’s display remains blank.
• The safety plug will not reset.
• The power cord, plug, or outlet becomes unusually hot.
• The air conditioner repeatedly trips the outlet or circuit breaker.
• The unit remains unresponsive after the five-minute reset.

Conclusion

These steps can help identify whether the problem is coming from the electrical outlet, circuit breaker, safety plug, or air conditioner. If the unit still does not turn on, discontinue use and contact TCL Support for additional assistance.