What to Do if Your Thermostat Keeps Blinking

Thermostat Keeps BlinkingAs we get into the hottest part of the year, you definitely don’t want to experience any issues with your air conditioner, of course. However, if you do that doesn’t automatically mean it will be a major problem that will cost you thousands of dollars. One common issue we see is when a customer’s thermostat keeps blinking. Today’s programmable thermostats are great, because not only do they help cooling systems run more efficiently, they can also warn you if there’s a problem. Let’s take a closer look at why this blinking problem occurs and what you can do about it.

Why it Happens

If your thermostat keeps blinking during the normal operation of your AC, that usually means there’s an issue with the outdoor portion of the system. It’s basically been locked out, meaning that it has shut itself down and sent a signal to the thermostat letting it know there’s an issue. In many instances, the indoor unit will continue to run because it is not aware that a problem has occurred.

Most programmable thermostats will flash a code when a problem takes place. Here’s what to do if this happens:

  • Count the number of flashes you see. It should be anywhere from two to nine.
  • Turn the thermostat off, wait 30 seconds, and turn it back on. While this may restart your system automatically, there is a chance that it could take up to 10 minutes.
  • Wait 10 minutes and see if the outdoor unit has started running again.
  • If it hasn’t, and there’s no obvious reason (like a tripped circuit breaker), you should call a professional.

The problem could simply be a fluke-type of weather-related issue and resetting should take care of it. However, if your thermostat keeps blinking after the reset, you may have an issue like excessive defrosting or a switch in the outside unit that is stuck open. Get in touch with the pros at Metro Express Service and we’ll diagnose and fix your problem quickly. Contact us online or call 972-263-2500 to schedule an appointment.


Randy Murphy

Randy Murphy has been building his knowledge of the air conditioning and heating business for several years now. He first started applying his knowledge while working for his father’s HVAC company. Later, in 1987, Randy started his own business: Metro Express Service. He has been a top 10 Trane & Amana dealer for over eight years. When it comes to heating and cooling, Randy knows the business better than anyone.
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