Are you starting to suspect your thermostat’s not working the way it should? When this unassuming device starts failing, it can impact everything from your energy bills to the comfort of your home. That’s why we’re covering all the essential facts, including why thermostats go bad, what to look for and what you can do about it.
Key Takeaways: How To Tell if Your Thermostat Is Failing
Your thermostat is the brain behind your HVAC system. Without it, your air conditioner, heat pump or furnace may behave in all sorts of unusual and counterproductive ways. Luckily, as long as you identify and address the issue quickly, it may not be as serious as you think.
Read on to get all the details, but here’s what you need to know:
- Modern digital thermostats typically last around 10 years before needing replacement
- Warning signs include a blank display, short cycling, poor comfort control and excessive energy use
- Minor problems may be fixed by cleaning, recalibration, battery replacement or software updates
- Older, out-of-date models are more likely to require a complete hardware replacement
- Upgrading to a smart thermostat can save money while improving comfort and convenience
10 Signs Your Thermostat Is Going Bad
It’s not always easy to decipher what’s wrong when your HVAC system goes haywire, but faulty thermostats often produce telltale clues. If you’ve noticed any of these troublesome symptoms, it’s a good bet your thermostat is the culprit.
1. HVAC Won’t Start Up
It doesn’t take an expert to recognize there’s trouble afoot if your thermostat has no effect on your HVAC system. Your AC may not immediately respond when you adjust the temperature, but it should eventually start producing cool air. If nothing happens at all, it’s likely your thermostat isn’t communicating correctly with the rest of your system.
2. HVAC Runs Continuously
The weather can get oppressive here in the Florida Panhandle, but that doesn’t mean your air conditioner should keep running nonstop. Indeed, an HVAC unit operating continuously is a clear sign of defective controls. It normally indicates your thermostat is either reading the wrong temperature or failing to send signals to your equipment.
3. Frequent Short Cycling
If failing to turn on or off is bad, the opposite might be even worse. It’s a condition called short cycling, and it happens when your system repeatedly runs for brief periods and shuts down before reaching your desired temperature. In addition to making your home less comfortable, this puts unnecessary wear and tear on equipment and increases the risk of mechanical breakdowns.
4. Inaccurate Temperature Readings
One quick and easy way to check the status of your thermostat is to verify that it’s sensing the right temperature. Place a standalone thermometer nearby and compare its readings to what’s displayed on your thermostat. If the difference is more than a degree or two, the thermostat may be faulty, incorrectly calibrated or placed in a bad spot.
5. Blank Screen or Unresponsive Controls
Has your thermostat’s display abruptly gone blank? Is the screen glitchy, frozen or refusing to respond to your inputs? Dropping in some fresh batteries or performing a quick reset usually suffices to solve the problem, but if not, it may be a case for your local HVAC experts.
6. Programs Keep Resetting
As useful as programmable thermostats are, it takes time to set up your schedule and tweak it to your precise preferences. Most units are capable of saving your settings even during brief power outages, but an equipment defect or software hiccup can erase all that hard work in an instant. If it happens more than once, the cause could be a serious power supply or internal memory issue.
7. Uneven Room Temperatures
Chronic hot or cold spots can form around your house for all sorts of reasons, but your thermostat should be considered a prime suspect. Maintaining a consistent temperature requires precise control, and if your thermostat isn’t getting the right readings, you’re bound to notice a change in comfort.
8. Delayed HVAC Response
Heating or cooling a home takes time, but your system should respond quickly when you change the thermostat set point. If it seems to take an eternity before you feel any relief, the delay may be down to a bad sensor reading or a crossed signal in your system’s communications.
9. Smart Thermostat Glitches
While smart thermostats are amazingly capable, they also rely on software that’s occasionally prone to app errors, connectivity issues and other glitches. In most cases, these hangups can be resolved by rebooting the thermostat or installing an update from the manufacturer.
10. Age Over 10 Years
Age may only be a number, but it’s a good indicator of when you should start thinking about thermostat replacement. Not only are older thermostats generally less accurate and reliable, but they lack the advanced features of today’s newer models. As a general rule, any thermostat that’s been in use for a decade is probably due for an upgrade.
Troubleshooting Table – Symptoms, Causes & Fixes
| Symptom | Likely Cause | DIY Fix |
|---|---|---|
| Blank display | Dead batteries, tripped breaker | Replace batteries, reset power |
| Running nonstop | Malfunctioning sensor | Recalibrate or replace |
| Short cycling | Faulty wiring or sensor | Inspect wiring, reset thermostat |
| Inaccurate readings | Poor placement, sensor drift | Relocate or recalibrate sensor |
| Loss of settings | Power loss, memory failure | Change batteries, update software |
When To Repair vs. Replace
You’ve noticed something funky with your HVAC system, you’ve done some investigating, and you’ve pinpointed the thermostat as the source of your troubles. So, what next? You can start with some basic troubleshooting, such as swapping out the batteries, cleaning the unit and checking for firmware updates.
If that doesn’t do the trick, the smart move is to schedule a professional service call. A skilled technician can easily diagnose and repair loose wires, poorly calibrated sensors and other minor issues. However, it’s often smarter and more cost-effective to replace your thermostat if:
- It’s more than 10 years old
- Its design or equipment is obsolete
- The controls are totally unresponsive
- It’s repeatedly failed after being repaired
Why Upgrade to a Modern Thermostat?
If your HVAC system is still tied to an old-school manual thermostat, you simply aren’t getting the best out of your equipment. Modern smart and programmable thermostats are designed to make your system more powerful, more efficient and so much easier to use. To see how, let’s break down what these cutting-edge controls have to offer.
Programmable Thermostats
A programmable thermostat does just what it says on the tin. Instead of constantly fiddling with a manual dial, you can program in preset temperature changes for specific days and times.
Don’t want your AC wasting energy all day while the house is empty? Just schedule your thermostat to run at a higher temperature when you leave for work and revert to a more comfortable setting before you arrive home.
Smart Thermostats
While programmable controls provide basic automation, smart thermostats take things to the next level. By actively learning and adapting to your daily routines and temperature preferences, they can reduce annual utility costs by up to 8% while simultaneously enhancing comfort. They even offer remote access via smartphone, putting control of your HVAC system at your fingertips no matter where you go.
Faulty Thermostat FAQs
Can I replace my thermostat myself?
Yes, as long as you’re opting for a similar model. If your new unit’s wiring doesn’t match the existing one, however, it’s better to call the pros.
Does thermostat placement matter?
Very much so! Thermostats need accurate temperature readings to work properly, so avoid exterior walls and areas exposed to drafts or direct sunlight.
How often should I check my thermostat?
At least once a year, but it’s best to give it a thorough checkup before the start of each heating and cooling season.
Restore Comfort and Efficiency Today
Worried your aging or outdated thermostat has finally kicked the bucket? Don’t let bad temperature controls destroy your comfort and tank your whole HVAC system. Just pick up the phone and call One Hour Air Conditioning & Heating in Niceville, FL!
Our veteran HVAC technicians deliver top-notch thermostat services all over the area, including accurate diagnostics, expert repairs and convenient, energy-saving smart thermostat upgrades. What’s more, we promise you won’t have to wait for relief. We’re always on time or you don’t pay a dime!