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Thermostat Solutions

Can a Broken Thermostat Cause Ac Not to Work?

ByRalph P. Sita Updated onJanuary 30, 2025

A malfunctioning thermostat can significantly impact your air conditioning system’s performance, potentially causing it to stop working altogether. The thermostat serves as the control center for your AC unit; if it fails, the AC cannot maintain a comfortable indoor temperature. Homeowners experiencing issues with their air conditioning should consider that a broken thermostat may be the culprit. Although a small component, the thermostat plays a critical role in regulating temperature; when it’s on the fritz, the AC unit may struggle to function efficiently. Consequently, this can lead to increased wear and tear on the AC system as it works harder to compensate.

If you suspect that your thermostat is malfunctioning and affecting your air conditioning, it is advisable to consult a professional HVAC technician. They have the expertise to diagnose the issue accurately and recommend the most effective solution. In many cases, simply replacing the thermostat can restore normal operation of your AC unit. However, if other underlying issues are discovered, such as damage to additional components, further repairs may be necessary to ensure your system operates at peak efficiency.

Can a Broken Thermostat Cause Ac Not to Work

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  • How Do I Know If My Ac Thermostat is Broken?
  • Air Condition Wont Start | AC Will Not Turn On | Thermostat Broken
  • Thermostat Troubleshooting
    • Related Articles

How Do I Know If My Ac Thermostat is Broken?

If your AC thermostat is broken, there are a few things that you can look for to be sure. First, check the batteries.

If they are dead or dying, they will need to be replaced in order to power the device.

Secondly, check the wiring to see if it is damaged in any way.

How Do I Know If My Ac Thermostat is Broken

Third, inspect the physical condition of the device itself for any cracks or damage.

Lastly, test it out by setting the temperature and seeing if it responds accordingly.

If none of these troubleshooting steps work, then you will likely need to replace your AC thermostat entirely.

Air Condition Wont Start | AC Will Not Turn On | Thermostat Broken

Thermostat Troubleshooting

A few things can go wrong with your thermostat, but luckily most of them are easy to fix!

Here is a troubleshooting guide to help you figure out what might be wrong and how to fix it.

1. Check the batteries.

This is the most common problem and an easy one to fix! Just replace the batteries in your thermostat and see if that does the trick.

2. Make sure the power is on.
If your thermostat is not receiving power, it cannot do its job properly. Check to make sure that the circuit breaker has not been tripped and that there are no loose wires.

3. Adjust the settings.
If your thermostat is set to “Auto” mode, it will automatically adjust the temperature based on the ambient temperature around it.

If you want more control over the temperature, you can switch it to “Manual” mode and set the temperature yourself using the + and – buttons.

4. Clean or replace dirty filters.
Over time, dust and dirt can build up on your air filters, making them less effective at doing their job.

This can cause your thermostat to work harder than necessary, leading to higher energy bills.

To avoid this, be sure to clean or replace your air filters regularly (depending on what type of filter you have).

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Ralph P. Sita
Author: Ralph P. Sita

Ralph P. Sita is a seasoned professional with deep roots in both the HVAC and tech industries. His family’s business, Ralph P. Sita, Inc., is a locally owned and operated HVAC contractor with over 42 years of experience, serving the DC, Maryland, and Virginia areas. The company specializes in residential, commercial, and industrial heating, ventilation, and air conditioning services, offering everything from installation and maintenance to custom ductwork and indoor air quality solutions -www.ralphpsita.com. A former CPA, he spent the last decade as co-founder and co-CEO at Cybrary, a leading platform for cybersecurity and IT training. Cybrary became the largest, most well-known cybersecurity training businesses in the industry under his leadership. Smart AC Solutions is an opportunity to give back to the HVAC community by providing reliable, actionable information on all things heating and cooling.

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  2. Can Dirty Air Conditioner Filter Cause It Not to Work?
  3. Will Low Antifreeze Cause Ac Not to Work?
  4. Will Low Coolant Cause Ac Not to Work
Ralph P. Sita

Ralph P. Sita is a seasoned professional with deep roots in both the HVAC and tech industries. His family’s business, Ralph P. Sita, Inc., is a locally owned and operated HVAC contractor with over 42 years of experience, serving the DC, Maryland, and Virginia areas. The company specializes in residential, commercial, and industrial heating, ventilation, and air conditioning services, offering everything from installation and maintenance to custom ductwork and indoor air quality solutions -www.ralphpsita.com.

A former CPA, he spent the last decade as co-founder and co-CEO at Cybrary, a leading platform for cybersecurity and IT training. Cybrary became the largest, most well-known cybersecurity training businesses in the industry under his leadership.

Smart AC Solutions is an opportunity to give back to the HVAC community by providing reliable, actionable information on all things heating and cooling.

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