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What is the symptoms of a bad or failing thermostat?

A malfunctioning thermostat can cause various issues with your home's heating and cooling system. The most common symptoms of a bad or failing thermostat include inconsistent temperature readings, the system not turning on or off properly, and the inability to maintain a consistent temperature in your home. Understanding these symptoms can help you identify and address the problem before it leads to more significant issues.


Inconsistent Temperature Readings


One of the primary signs of a failing thermostat is inconsistent temperature readings. If the thermostat displays a temperature that does not match the actual temperature in the room, it could indicate a problem with the thermostat's sensors or internal components. This can cause the heating or cooling system to run more or less than necessary, leading to uneven temperatures throughout your home.


System Not Turning On or Off


Another common symptom of a bad thermostat is the inability to turn the heating or cooling system on or off. If the system does not respond to temperature changes or thermostat adjustments, it could be a sign that the thermostat is malfunctioning. This can result in the system running continuously, even when it's not needed, or failing to turn on when the temperature drops or rises.


Inability to Maintain a Consistent Temperature


A well-functioning thermostat should be able to maintain a consistent temperature in your home. If you notice significant temperature fluctuations, even after adjusting the thermostat, it could indicate a problem with the thermostat's ability to accurately read and respond to changes in temperature.


Other Symptoms


In addition to the above symptoms, a bad or failing thermostat may also cause the following issues:



  • Short cycling: The heating or cooling system turns on and off more frequently than it should.

  • Erratic temperature changes: The temperature in the home may suddenly spike or drop without any apparent reason.

  • Thermostat display issues: The thermostat's display may be blank, flickering, or showing incorrect information.


If you experience any of these symptoms, it's essential to have a professional technician inspect your thermostat and the entire HVAC system to identify and address the underlying issue.

How do I test my thermostat?


One easy thing you can do to check the accuracy of your thermostat is to do a temperature check. See what your thermostat reads. Then use a portable indoor thermometer to compare the temps. Another good way to do the temperature check is to download one of the many free apps that allow you to check indoor temperatures.



What are the symptoms of a thermostat not opening?


Overheating is the most common symptom of a failing thermostat. Due to corrosion or aging, your car's thermostat can get stuck in a closed position. If this happens, the thermostat will not let the coolant reach the radiator, and, as mentioned above, the engine will overheat, causing severe damage.



How do you tell if you have a faulty thermostat?


7 Ways to Tell Your Thermostat Is Broken

  1. The Thermostat Has No Power.
  2. The AC or Furnace Won't Turn On.
  3. The Heater or AC Won't Turn Off.
  4. The Thermostat Reading Doesn't Match the Room Temperature.
  5. The Thermostat Doesn't Respond.
  6. The HVAC System Is Short Cycling.
  7. The Thermostat Forgets Programmed Settings.



How much does it cost to replace a thermostat?


Replacing a Thermostat. You'll pay between $15 and $300 for the unit in addition to labor ($65 to $100 per hour) to replace an old thermostat with a new one. However, installing a brand-new thermostat is more involved and, therefore, more expensive.



What are the symptoms of a bad head gasket?


Oil burning on the engine. Fluid leaks from around the head gasket. Engine overheating. Poor performance or engine stuttering.



Can I still drive my car with a bad thermostat?


If you drive with a bad thermostat, your car could overheat, causing severe and expensive engine damage. And while it's technically possible to drive without a thermostat, we don't recommend it. Your car will not reach an acceptable operating temperature, resulting in higher fuel consumption and excessive engine wear.



How to unstick a car thermostat?


This is an easy problem to solve yourself by simply removing the plastic outer casing and, with a very soft brush, delicately brushing off its coil and contact surfaces. It is most effective to clean the thermostat first at its lowest setting, then again at its highest setting.



How do you know if you need to replace thermostat?


Signs You Need a New Thermostat

  1. Heating or cooling system will not turn off or on.
  2. The temperature reading is incorrect.
  3. Recent spike in your energy bill.
  4. Frequent temperature fluctuations.
  5. Thermostat is 10 years old or older.



What happens when a car's thermostat goes bad?


If your thermostat goes bad, it can lead to a range of problems, from decreased fuel efficiency to engine overheating. In this article, we'll discuss the top signs of a faulty engine thermostat and provide you with steps on how to fix them. A smokey car engine shows signs of a lack of maintenance.



How do you test a thermostat?


Get an Indoor Thermometer
Another way to test your thermostat is to use a thermometer. Place the thermometer in the room and turn on the AC. After a few minutes, check the thermometer to see what temperature it's reading. The temperature should be lower than when you started.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.