An incorrect thermostat reading is usually caused by bad sensor placement, dust buildup, drafty wall cavities, or lost calibration. A discrepancy of 1 −2∘𝐹 is normal, but anything larger usually points to a fixable issue.
If your thermostat is not reading correctly, it might be due to a dirty or faulty sensor. A quick fix could be to gently clean the sensor with canned air to remove any dust buildup. However, if problems persist, replacing the thermostat could be the next step.
Use the manual to find the screw for calibration. Turn the screw to match the temperature of the thermostat to the room temperature. Turn the HVAC system and the power back on, and the power. Turn on the thermostat and wait a few minutes for it to adjust to the temperature.
Like any home appliance, your thermostat will eventually get old and start to develop problems like reading the wrong temperature. Replacing your thermostat with a newer model will not only fix your problems, but will also likely give you access to energy-saving features like programmable settings.
One of the biggest culprits behind a cold home is inadequate insulation. Your HVAC system may be producing enough heat, but if it's escaping through walls, windows, doors, and ceilings, you'll struggle to maintain warmth. Check for Drafts – Cold air can seep in through gaps around windows and doors.
If you're cold even though your thermostat indicates you shouldn't be, your furnace likely isn't the problem. In most cases, it's working just fine. It's your home that needs attention. Lack of insulation, severe air leakage, and/or unbalanced ductwork are frequently to blame.
How can you tell if a thermostat is bad?
What to Do If Your Thermostat Is Changing on Its Own. First, take a close look at your thermostat to determine if it's non-programmable or programmable. Non-programmable thermostats will keep turning off and on if they intermittently lose power, which is usually the result of a faulty circuit board.
Clean the Thermostat
Sometimes, when the room temperature doesn't match the thermostat setting, the problem could be dirt buildup on its interior parts. A dirt coating around the inner components may create excess heat and cause the thermostat to give the wrong readings.
Checking the calibration of your thermostat is easy and should be done once a year, generally in the fall. To do so, locate your home's thermostat and tape an accurate thermometer on the wall next to it. Wait 15 minutes and check the temperature reading on both devices.
With prices for a standard thermometer calibration starting at £22.00 we are sure we won't be beaten on price. Simply send us your instruments either by courier or through the post and we will do the rest. Our turnaround time is usually within three working days!
Let's explore some of the most common causes for unreliable temperature readings.
Faulty Wiring or Loose Connections
Another common reason why is my thermostat stuck on one temperature is faulty wiring. Over time, wires might become loose or rusted, interfering with communication between your thermostat and HVAC system.
Disconnect the old thermostat and unscrew the mounting plate. Check the new thermostat instructions for compatibility and wiring guidance. Connect the labeled wires to the new thermostat. Attach the new mounting plate to the wall.
Average Lifespan of a Thermostat
With a straightforward design and basic scheduling features, they are reliable workhorses that can last 10 to 15 years with proper care. Routine programming updates and occasional recalibrations go a long way toward keeping them accurate and extending their usefulness.
Not always. If your existing thermostat wiring is straightforward and you're comfortable working with basic electrical systems, you can likely replace it yourself. However, if the wiring is damaged, outdated, or incompatible with your new thermostat, calling an electrician is a smart move.
A common reason your thermostat may be resetting itself is if your home is having power issues. Check and replace the batteries if applicable. Look for loose or damaged wiring, but don't touch it. Ensure the power supply to the thermostat and your HVAC system is stable.
There are several ways to check the health of your car's thermostat and you don't necessarily have to remove it: observing the coolant flow or measuring the temperature of the upper and lower radiator hoses with an infrared thermometer.
Modern home thermostats tend to have about a 10-year lifespan but are usually replaced sooner due to innovations in the market. Non-programmable thermostats have become outdated and replaced by programmable (or learning) thermostats.
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.
One of the most common thermostat-related problems that homeowners run into involves incorrect temperature readings. A thermostat that displays incorrect temperature readings can cause significant heating issues. There are several potential causes of an incorrect temperature reading, starting with improper placement.
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.
Signs a Thermostat Is Bad
Check the circuit breaker for the thermostat to confirm that it hasn't tripped. If you adjust the temperature setting and there's no change in the indoor air temperature, it could be due to the thermostat.