man opening heater to repair it

What’s Wrong With My Heater?

Solving Heater Problems

Even in sunny South Carolina, there are days when we rely on our heaters to keep our homes comfortable, warm, and cozy. Of course, there are some of those days when we go to turn the heat on, only to find that it’s not doing its job as it should.

In many instances, we would recommend calling in the professionals to take a look at your heater to diagnose and fix the problem. However, there are a few instances where you can solve the issue on your own. The Dunes Heating and Air Conditioning, LLC team is here with a few common heater problems and solutions to keep your home heating going smoothly this season.

No Heat

When your heater is refusing to produce heat, you know there’s definitely a problem. If this happens, first check the settings on your thermostat. It may have accidentally been set to “fan” rather than “heat”. Switch it back and you should be good to go!

If the thermostat settings weren’t the issue, it may be due to a dirty filter. Your air filters are an essential part of your heater and when they become clogged, they can cause a whole host of problems. Check your air filters and change them about every three months to keep things running efficiently.

If the air filters are clean and your no-heat problem is persisting, it’s time to call in the professionals for diagnosis.

Frequent Cycling

Your heater will kick on and off as it works to reach the desired temperature set on the thermostat. But if it seems to only stay on for a few moments before turning off again, there may be an issue. There are several factors that could be causing this:

  • Dirty air filters. They aren’t allowing air through to the heat exchanger and causing overheating.
  • Faulty thermostat. It is unable to properly read the temperature of your home and fails to communicate with the heater.
  • Wrong sized unit. If your heater is too big or too small, it can have a hard time knowing how to correctly heat the home.


While your heater will make some noise as it heats up the home, anything louder than usual or out of the ordinary should be looked at by a professional.


If you’re hearing a rattling noise while the heater is on, there is most likely a loose component somewhere within the system. This could be a panel on the heater or a piece of duct work. An HVAC specialist will be able to help you find the source of the noise and tighten it up in no time.


A loud squealing sound is usually caused by a worn out or frayed blower belt. This will need to be replaced in order to stop the sound and to get the heater working properly once again.


Ball bearings help the heater’s motor run smoothly. Over time, they can become worn out and begin making a scraping noise. Simply have them replaced, and your unit will be running efficiently and quietly again.


A leak from your heater is never a good sign. There are some types of heaters that can experience condensation leaks. This could simply be due to a tear in the unit, or a clogged condensation drain. You will need to have the hole repaired, or the condensation drain cleaned to get the leak under control.

Heater Repairs in Mount Pleasant

If you’re experiencing one of more of these problems with your heater, or have a problem other than this, give Dunes Heating and Air Conditioning, LLC a call at (843) 892-5444. You can also check out our services online.