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Serious Furnace Issues Only Professionals Can Solve

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Serious Furnace Issues Only Professionals Can Solve

Posted On: January 26, 2025

Serious Furnace Issues Only Professionals Can Solve

A furnace is essential for keeping your home warm and comfortable, especially during cold months. While regular maintenance can prevent many problems, certain furnace issues are too complex or dangerous for DIY repairs. Here are some serious furnace problems that require the expertise of a professional technician:



1. Furnace Not Producing Heat

If your furnace isn’t producing heat despite being turned on, it could be due to issues such as:


  • A failed ignitor or pilot light. Modern furnaces use electronic ignitors or pilot lights to start the heating process. If these components fail, your furnace won’t produce heat.
  • Thermostat malfunctions. Incorrect calibration or a faulty thermostat can prevent your furnace from activating properly.

These problems require technical know-how and specialized tools to diagnose and repair.



2. Frequent Cycling (Turning On and Off)

Short cycling can lead to inefficient heating and increased wear on your furnace. Causes may include:


  • Clogged air filters. Restricted airflow forces the furnace to overwork, causing frequent shut-offs.
  • Improper thermostat placement. A thermostat located near heat sources may cause your furnace to turn off prematurely.
  • Overheating. Internal components may overheat due to mechanical failures or blockages.

A professional can identify and fix the root cause to prevent long-term damage.



3. Unusual Noises

Banging, screeching, rattling, or whistling noises are often signs of serious internal issues such as:


  • Loose or damaged belts.
  • Malfunctioning blower motors.
  • Cracked heat exchangers.

Ignoring these sounds can result in costly repairs or even safety risks, such as carbon monoxide leaks.



4. Uneven Heating

If certain rooms in your home are significantly colder or warmer than others, it may indicate:


  • Ductwork issues. Leaks, blockages, or poor design in your duct system can reduce airflow.
  • Aging or undersized furnaces. Your furnace may not have the capacity to heat your home efficiently.

A technician can assess your heating system and suggest solutions such as zoning systems or upgrades.



5. Gas Leaks or Carbon Monoxide Concerns

A gas leak or carbon monoxide issue is a critical safety hazard. Warning signs include:


  • A strong smell of gas.
  • Physical symptoms such as nausea, dizziness, or headaches, which could indicate carbon monoxide exposure.
  • A yellow or flickering burner flame instead of a steady blue one.

These situations require immediate professional attention to ensure your home and family are safe.



6. Persistent Pilot Light Problems

If your pilot light frequently goes out or burns with an unusual color (like yellow instead of blue), it may point to:


  • A dirty or clogged burner. Debris buildup can disrupt gas flow and ignition.
  • Thermocouple issues. A faulty thermocouple can prevent the pilot light from staying lit.

These components are delicate and should only be handled by a trained technician.



7. Electrical Problems

Blown fuses, tripped breakers, or problems with the furnace's control board can cause operational failures. These issues are complex and involve working with live electricity, which poses a risk if not handled properly.



Why Professional Repairs Matter

Attempting DIY repairs for serious furnace issues can:


  • Void your warranty.
  • Lead to incorrect or incomplete fixes.
  • Risk your safety due to exposure to gas leaks or electricity.

Certified technicians have the training, tools, and experience to diagnose and repair furnace issues safely and efficiently.



Final Thoughts

When your furnace encounters serious problems, don’t risk your safety or the comfort of your home by trying to fix it yourself. Contact a trusted HVAC professional to ensure your furnace is repaired correctly and operates efficiently for years to come.



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See What Our Customers Are Saying:

by Steve V, Toronto on Twintech Heating and Cooling

Our old water tank was installed in 1997. Wasn't working as well as it should so we looked into a tankless as it is more efficient and a space saver! we had used Twintech in the past for a furnace cleaning and were satisfied with that so we decided to ask for a quote for the changeover. Gary arrived and provided the options and the quote fit within our budget so we decide to go with them after receiving a few alternative quotes from other companies. They did what the said would be done and it was completed within a reasonable time frame! Removal and cleanup of the old tank was seamless. We are now enjoying consistent and efficient Hot water! I recommend Twintech and would use them for future projects!

by New AC Unit + Humidifier on Twintech Heating and Cooling

One of the most honest HVAC companies out there! Dave was very helpful and informative in helping us choose a new AC unit. While they weren’t the lowest quote, we went with them because we trusted Dave and he was the most honest guy out of the companies that quoted us.
Greg and his crew who installed the unit were very professional and did a great job. If I could do it over again I would choose Twintech again.

by Private User on Twintech Heating and Cooling

Relocated and replaced our air conditioning unit. Fast, professional, and high quality service. We would definitely use them again for future projects!

by Ian, Toronto on Twintech Heating and Cooling

The term excellent or incredible does not seem high enough praise for the Twintech Heating and cooling company that recently replaced our 15 year old furnace. To start with, the response from Dave at Twintech to our original pricing request was the quickest and most professional of the 5 prices we received which included two of the primary natural gas providers. The Twintech pricing was the most competitive by a considerable margin.
We had Dave visit our home to confirm all pricing which he did and scheduled us for next day installation which was not offered my the majority of the other providers.
The installation; the team arrived on time and provided coverings to all of the hardwood flooring and stairs and proceeded with the removal and reinstallation of the new furnace, the workers predicated six hours and were completed in five hours. I have to mention how courteous and polite the workers were each time we interacted with them from start to finish.
The final result was amazing, all materials were cleaned up and removed from the house and the workmanship very impressive.
One feature that really stood out for me which shows a high level of professionalism was that we had various condensation hoses from the furnace , humidifier and an air filtration unit meeting at the one drain, the installation crew ran PVC tubing including elbows along two sides of the furnace to guide the hoses into one PVC tube at the drain, it looks great!
When the install was completed and tested the Twintech technician guided us through the features and recommendation's for care of the new furnace.
We highly recommend Twintech to anyone for the outstanding service provided to us.

by Stephen, Pickering on Twintech Heating and Cooling

I didn't hesitate to call Twintech in for a 2nd time as they did an outstanding job installing my new furnace last year. This time my 18 year old air conditioner was on its last legs. Greg and the team are top notch, highly skilled technicians. The job was executed in a timely and professional manner. Greg was extremely thorough and went the extra mile to make sure everything was operating efficiently. Lastly, Dave is a true gentleman and really made the customer experience pleasurable and worry free. Always remember that good work ain't cheap and cheap work ain't good.

by Derek, Whitby on Twintech Heating and Cooling

It's so hard to find solid companies these days, but I was very pleased to find one in Twintech. Greg and his crew were very clean, respectful and professional. We were most impressed at how all the things they said they would do, were done. Sounds strange, but usually when a contractor comes to your home they say they will take care of this and that, make sure this is done, etc but when the work starts you have to constantly remind them of your previous discussions. Greg ensured every item he said he would do was done, no reminders required. The work was done right, at a fair price and on time. We will be sure to call them when our A/C unit dies (fingers crossed that's not going to happen too soon :) )

by Patrick, Toronto on Twintech Heating and Cooling

Replaced our aging hot water tank with a tankless system. Excellent work, fast efficient and clean.

Walked us through the new system and recommended maintenance schedule.

This is our second time working with TwinTech and we are very happy with the quality of their work and professionalism.

by Troy, Toronto on Twintech Heating and Cooling

Efficient work and great follow up by the team at Twin Tech. Great product and communication.

by Peter, Pickering on Twintech Heating and Cooling

On coldest night of the year our furnace quit. At 8:40 in the morning Greg arrived and gave us a diagnosis and a recommendation. By 2:30 we had a new furnace and were warm again. Great company. Great customer service. Good reasonable price.

Peter, Pickering

by New Furnace Installed on Twintech Heating and Cooling

Twin tech team was very efficient and prompt. They provided a quote within hours of request and got the job done on time. No disruption to home function. We would highly recommend this team. Job well done.

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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.

by Robert Mizuno on Twintech Heating and Cooling

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!

by Ruth on Twintech Heating and Cooling

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!

by Anna Chin on Twintech Heating and Cooling

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!

by Connor Agnew on Twintech Heating and Cooling

Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.

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