Window air conditioner thermostats can typically last for around 10 years, but that timeframe depends upon the usage and maintenance. So, the chances are that they might develop faults earlier because of some minor or major issues. Fortunately, these issues can be repaired if taken care of and if you observe the problems to find the correct solution for the same.
Let us look at some of the most common problems faced by the users and ways of fixing those problems.
Causes of a Malfunctioning Window AC Thermostat
A common reason a window air conditioner isn’t cooling properly is a malfunctioning thermostat.
Dust & Dirt Buildup
Over time, dirt and dust can accumulate inside the thermostat, preventing it from accurately reading the temperature.
How Dirt Affects Your Thermostat
- When dust and debris build up, the thermostat can start sending incorrect signals to your window AC unit.
- This can cause the unit to turn on and off unexpectedly or fail to maintain the desired temperature.
Cleaning the thermostat thoroughly is often the first step in troubleshooting a window AC that isn’t performing correctly.
How to Clean a Window AC Thermostat?
- Turn off the AC and remove the wire. Before cleaning, make sure to disconnect the thermostat wire that runs from the base of the AC to the middle of the coils.
- Wipe the thermostat gently. Use a clean paper towel to run along the length of the thermostat wire, removing dirt and debris.
- Check the thermostat placement. Ensure the thermostat isn’t leaning against any part of the AC unit or obstructing airflow, as this can affect temperature readings.
Damaged Wiring
When wiring is damaged, the thermostat may not communicate properly with your window unit. This can mimic other problems, like short cycling or inconsistent cooling, and make it difficult to identify the root cause without inspection.
How to Inspect Thermostat Wiring
- Turn off the AC power. Safety first! Always disconnect power before checking wires.
- Inspect the wiring carefully. Look for frayed insulation, loose connections, or wires that have come undone.
- Contact a professional. If you notice damage or loose connections, contact a licensed technician. They can safely replace the frayed wiring or secure the connection to ensure your AC operates correctly.
Faulty Thermostat Sensor
Sometimes the sensor itself is the problem. The sensor is a small wire or probe inside the thermostat that reads the temperature near the evaporator coils. If it’s bent, touching the coils, or otherwise obstructed, it can send inaccurate readings to your AC unit.
How to Check & Adjust the Thermostat Sensor
- Locate the sensor. The sensor is usually a thin wire running along the coils of your window AC unit.
- Inspect for bends or contact with coils. Make sure the sensor isn’t touching the evaporator coils, as this can give false readings.
- Reposition the sensor. Gently place the sensor in the correct position so it can accurately measure room temperature without obstruction.
- Test the system. Turn the AC back on and verify that it maintains consistent cooling and operates correctly.
How to Reset a Window AC Thermostat
- Turn off the AC. Press the power button to switch off your window air conditioner.
- Wait for the unit to power down. Wait a few seconds for the power in the compressor and the LED lights to turn off.
- Disconnect the unit from power. Shut off your electricity and disconnect your air conditioner.
- Turn the AC back on. Reconnect the unit and power it on. Check the thermostat settings to see if they’ve returned to the default settings.
- If settings haven’t reset, try again. Turn off the unit once more and allow it to remain off for 20 minutes to 1 hour to give the thermostat time to reset.
Some window AC units have a dedicated “reset” button. Pressing it will restore the default thermostat settings without needing to unplug the unit. If you’re unsure whether your AC has a reset feature, refer to the user manual for model-specific instructions.
For professional handling of HVAC repairs - including window thermostat issues - get in touch with Wolcott. To book an appointment, call at (971) 253-7883.