To fix a thermostat that isn't turning on, is misreading the temperature, or isn't communicating with your HVAC, start by troubleshooting the power source. Replace the batteries, turn off the breaker for 30 seconds for a hard reset, and check that your wiring is secure.
A thermostat might stop working for several reasons, ranging from simple fixes to hardware issues.
Replacing a thermostat is a project many homeowners can handle, but it's important to know your limits. With safety precautions, the right tools, and a clear set of instructions, you may feel confident tackling the job yourself.
Whether a thermostat has a reset button depends entirely on its make and model. Many modern smart thermostats (like Nest or Ecobee) have a reset option in their on-screen settings, while some digital models have a recessed button you must press with a paperclip. Other models require a specific button combination, or a battery/circuit breaker flip.
7 Ways to Tell Your Thermostat Is Broken
How can you tell if a thermostat is bad?
Most home thermostats last between 10 to 15 years. However, this lifespan varies significantly by the type of unit you have.
Locating the Reset Button
To find it, you should first turn off your HVAC system to ensure safety. Remove the thermostat cover by either snapping it off or unscrewing it, depending on the model. Most modern thermostats will have a clearly marked reset button inside the panel.
Signs That You Should Reset Your Thermostat
A standard thermostat reset takes just 30 seconds to 5 minutes, depending on the model.
To test your home thermostat, perform a simple system check: set the temperature a few degrees above (for heat) or below (for cool) the room temperature. Listen for a "click" and wait to see if your HVAC system turns on. If nothing happens, you can troubleshoot the device yourself.
A plumber isn't usually needed for thermostat replacement unless your thermostat directly controls a water-based heating system, such as underfloor heating or a boiler with complex plumbing connections. Even then, an electrician is typically the right professional to handle the wiring.
Thermostat problems are often fixable with basic troubleshooting, like checking settings, replacing batteries, inspecting wiring, and resetting the system. Cleaning and calibrating the thermostat can restore accurate performance, especially if dirt buildup or incorrect temperature readings are causing issues.
To quickly fix a broken thermostat, first verify the device has power by replacing the batteries and resetting the circuit breaker. Next, turn off the power, remove the cover, and tighten any loose wires. Clean away dust, or replace the entire unit if the issue persists.
Many homeowners are curious whether they need an electrician to replace a thermostat or if they can install a home thermostat on their own. While some try the DIY route, professional thermostat installation is usually the smarter, safer choice—especially with the range of high-tech models available today.
What are the signs of a broken boiler thermostat?
Resetting your thermostat clears temporary glitches and restores factory defaults. To reset your device quickly, choose the method below that matches your thermostat type:
Replacement of thermostat unit
Upgrading to a new thermostat (unit + installation) typically runs $140 to $350, depending on model and complexity. There is also a broader range—$80 to $440—with variations based on location and type of thermostat.
Pushing the reset button on a thermostat clears errors and restores communication with your HVAC unit. However, depending on the type of reset, it will usually erase all custom schedules, temperature settings, and Wi-Fi configurations.
Dead Batteries or Power Issues
If your thermostat is battery-powered, weak or dead batteries may prevent it from sending the signal to turn on the furnace. Replace the batteries with fresh ones to rule this out. For wired thermostats, check your home's electrical panel for tripped breakers or blown fuses.
To reset a thermostat without a reset button, you can perform a power cycle at your circuit breaker, reset it via the on-screen menu, or use a combination of button presses.
If you're swapping a like-for-like battery-powered thermostat, it's often a straightforward DIY job. However, if your thermostat is hardwired into the mains or connects directly to your boiler controls, it's best to leave it to a qualified heating engineer.
You likely need a thermostat replacement if your home temperature feels inconsistent, the display screen is unresponsive, or your heating and cooling system cycles on and off frequently. Upgrading is also recommended if you notice sudden spikes in energy bills without a change in usage.
Yes, 72°F is a very comfortable temperature for your daytime heat setting. However, it is slightly higher than the recommended energy-saving guidelines, which could increase your heating bill.