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Furnace: Malfunctioning Thermostat?

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Furnace: Malfunctioning Thermostat?

Posted On: December 5, 2024

Furnace: Malfunctioning Thermostat?

If you're experiencing issues with your furnace, a malfunctioning thermostat might be the culprit. Here's how to identify the problem and address it:


Signs of a Malfunctioning Thermostat

  1. Temperature Discrepancies: The room feels colder or hotter than the thermostat's settings.
  2. Frequent Cycling: The furnace turns on and off too frequently, or not at all.
  3. Unresponsive Thermostat: The display is blank, or the unit doesn't respond to adjustments.
  4. Incorrect Readings: The temperature displayed on the thermostat doesn’t match the actual room temperature.

Common Causes

  1. Dead Batteries: For battery-powered thermostats, this is often an easy fix.
  2. Dirt or Debris: Dust can interfere with sensors or electrical connections.
  3. Loose Wiring: Wires inside the thermostat can loosen over time, disrupting communication with the furnace.
  4. Outdated Model: Older thermostats may fail to regulate modern furnaces efficiently.

Troubleshooting Steps

  1. Check Power: Ensure the thermostat has power. Replace batteries or check circuit breakers if necessary.
  2. Clean the Unit: Remove the cover and gently clean any dirt or debris with a soft brush.
  3. Verify Settings: Ensure the thermostat is set to "Heat" and the temperature is above the current room temperature.
  4. Inspect Wiring: Check for loose or frayed wires, but only if you're comfortable doing so.

When to Call a Professional

If troubleshooting doesn’t resolve the issue, a professional HVAC technician can:


  • Test the thermostat for defects.
  • Check furnace compatibility with the thermostat.
  • Install a new, energy-efficient model if needed.

Upgrading to a programmable or smart thermostat could also improve efficiency and comfort in your home.



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by Floreene in Whitby on Twintech Heating and Cooling

My old furnace had finally broken down for the last time when contacted twintech to have a new furnace installed…They were prompt, knowledgeable and very reasonably priced. They did such a great job i tell all my friends and family about this company.

by Damien McIsaac. Ajax on Twintech Heating and Cooling

To whom it may concern, I recently had TwinTech (Greg and Grant Dainty) replace my furnace and service both my gas fireplaces and air conditioning unit. They were professional, courteous and very fair in their pricing. I would gladly recommend TwinTech to anyone needing work done. I can be contacted at 905-626-XXXX.

by Blair N. - Toronto on Twintech Heating and Cooling

My Fiancé and I have relied on Twintech Heating and Cooling now for the better part of the last 10 years. In that time, Greg has installed a furnace, an air conditioner, and a heat-pump at our residence in Toronto. In each instance Greg and his team were a pleasure to deal with. They were courteous and professional throughout the whole process and the quality of their work is first rate. Our experiences have always been extremely positive and we have referred his services numerous times to our friends and family. Without hesitation, I would recommend Greg and TwinTech Heating and Cooling to anyone looking to service or replace their existing heat/AC equipment

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See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

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We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

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TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

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Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!

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