Why Is Your Thermostat Blank? Troubleshooting Common Causes

Travis Bennett • June 12, 2023

A blank thermostat can be frustrating and concerning, especially during hot or cold weather when you need your HVAC system to work properly. If your thermostat is not displaying any information, or only showing a blank screen, here are some possible reasons and solutions you can try.

 

Drain pan pool water

If your air conditioner’s drain line is clogged or not connected properly, the drain pan may fill up with water and trigger a secondary switch that turns off the system for safety reasons. To fix this, you can check the drain line for blockages or disconnects, clean the drain pan and line, and reset the switch according to the manufacturer’s instructions.

 

Power surge from lightning

Electrical storms can cause power surges that may damage your HVAC system or its components, including the thermostat. To protect your system, you can install surge protectors or lightning arrestors, which can intercept and redirect high voltage spikes away from your devices.

 

Blown fuses in unit

Short circuits or overloads can blow fuses in your air conditioner or furnace, which can cause your thermostat to go blank or lose power. To replace a blown fuse, you can consult your owner’s manual or contact a qualified technician who can safely diagnose and fix the issue.

 

Clogged drain in summer

During the summer, your air conditioner produces condensation that needs to drain away properly. If the drain line gets clogged with dirt, debris, or algae, the excess water can back up and trip a safety switch that turns off the unit. To prevent this, you can check your drain line periodically, clean it with bleach or vinegar, and make sure it has an accessible termination point to allow water to flow freely.

 

These are some of the most common causes of blank thermostats and some DIY or professional solutions you can try. However, if none of these fixes work or if you’re not comfortable handling HVAC issues on your own, you can always contact a trusted and licensed HVAC company for help. A professional technician can diagnose the problem accurately, provide safe and efficient repairs, and offer advice on how to prevent similar issues in the future. Don’t let a blank thermostat ruin your comfort or safety.

How to Extend the Life of Your HVAC System with Seasonal Maintenance

September 18, 2025
Your HVAC system is one of the most important investments in your Wendell, NC home. It keeps you comfortable year-round, whether it’s battling the summer heat or taking the chill out of a crisp fall morning. With proper care, your HVAC system can last 15–20 years or even longer. The key? Regular seasonal maintenance. At American Comfort Services, we believe that a little upkeep goes a long way. Here’s how seasonal maintenance can extend the life of your HVAC system while saving you money in the long run. 1. Keep Your System Running Efficiently Over time, dirt, dust, and debris build up inside your HVAC system, making it work harder than it needs to. Seasonal tune-ups ensure your system is cleaned, lubricated, and inspected for wear and tear. When your system runs efficiently, it puts less strain on the components—helping them last longer and keeping your energy bills lower. 2. Catch Small Issues Before They Become Major Repairs A worn belt, a loose connection, or a clogged filter might not seem like much, but left unchecked, these small problems can cause expensive breakdowns. Seasonal maintenance allows a trained technician to catch and fix these issues early, preventing costly repairs and unexpected downtime when you need heating or cooling the most. 3. Improve Indoor Air Quality A well-maintained HVAC system doesn’t just heat and cool your home—it also helps keep the air you breathe cleaner. Replacing filters regularly and ensuring coils and ducts are free from buildup reduces dust, allergens, and pollutants in your living space, promoting healthier indoor air quality for your family. 4. Protect Your Warranty Many HVAC manufacturers require regular professional maintenance to keep your warranty valid. Skipping seasonal tune-ups could leave you without coverage if something goes wrong. By scheduling annual maintenance, you’re not only extending the life of your system but also protecting your investment. 5. Stay Comfortable Year-Round Nothing is worse than your HVAC system failing in the middle of a heatwave or a freezing night. Seasonal maintenance helps ensure your system is always ready to keep up with the demands of each season, so you can relax knowing your home will stay comfortable no matter the weather. Schedule Your Seasonal HVAC Maintenance in Wendell, NC Taking care of your HVAC system with regular tune-ups is the best way to extend its lifespan, save money, and avoid unexpected breakdowns. At American Comfort Services, our experienced technicians are here to provide thorough, reliable maintenance tailored to your system’s needs. Check out our maintenance service page to learn more about how we can keep your comfortable all year long. Call us today at 919-325-6626 or schedule your seasonal maintenance online to keep your HVAC system running strong for years to come!

Affordable Solutions to Breathe Cleaner Air at Home

By Travis Bennett • May 20, 2025
Clean air doesn’t have to be a luxury. In fact, a few smart upgrades can drastically improve your indoor air quality—and your health. Here are some high-impact solutions we recommend to clients all the time: HEPA or MERV-13+ Filters: Trap pollutants that standard filters miss. Whole-home air purifiers: Capture 99% of particles and allergens. UV […] The post Affordable Solutions to Breathe Cleaner Air at Home appeared first on American Comfort Services.

Is Your Home’s Air Dirtier Than the Outdoors?

By Travis Bennett • May 10, 2025
Most of us worry about outdoor pollution—especially during wildfire season or smog alerts. But what about the place you spend 90% of your time? Your home might be exposing you to more harmful air than the outdoors. People often assume their homes are safe havens. But according to the EPA, indoor air can be 2 […] The post Is Your Home’s Air Dirtier Than the Outdoors? appeared first on American Comfort Services.