Expert Trane furnace diagnostics and repair from a locally owned St. Louis HVAC company — honest answers, no upsell.
If your Trane furnace isn't heating properly — or isn't turning on at all — Thomas Hoffmann Air Conditioning & Heating is ready to help. We are a locally owned St. Louis HVAC company with hands-on experience in furnace repair and Trane heating systems. Whether you're dealing with a fault code, a cracked heat exchanger concern, or a furnace that simply won't fire, our technicians will diagnose the problem accurately and give you honest repair options.
Call (314) 471-7625 to schedule Trane furnace repair in St. Louis. We serve the St. Louis metro including Chesterfield, Ballwin, Kirkwood, Webster Groves, Des Peres, and surrounding areas.
Nick was great! He came right out and was able to solve the problem fairly easily. He communicated well and helped us prevent a future problem as well.
Response from the owner:Thank you for the review, Philip! We are happy to hear you had a pleasant experience working with us.
Response from the owner:Thank you, Pat, for your kind words about Giovanni; we appreciate your feedback and are glad to hear that he made a positive impression.
They have never failed to fix my hvac problems. These folks are top tier.
Response from the owner:Thank you for the wonderful feedback, Greg! We're glad to hear that you've had such positive experiences with our team. Providing timely and effective service is our priority, and we're here whenever you need us. Looking forward to assisting you again!
Giovanni was very professional, helpful, patient and helped me figure out the issue, if it was covered under warranty, and next steps. Great overall experience and much appreciated.
Response from the owner:Thank you, Amy! We're glad to hear that Giovanni provided you with such professional and helpful service. Your appreciation means a lot to us!
Always professional and thorough whenever they service our home. We have used Thomas Hoffmann Air Conditioning & Heating multiple times since we moved into our home and will continue to use them in the future.
Response from the owner:Thank you for the thoughtful review, Joe. We appreciate you and your business!
0 stars if I could. Bought a faulty (not to mention overpriced) surface igniter, called back five minutes later after installing, of course they didn’t stand behind their part. Go to Grainger instead. Same (working) part, half the price.
Response from the owner:Hi there. I am unable to locate your customer profile. Please give our office a call at 314-471-7625 so we can get this figured out for you.
From the phone to the completion of the job everyone is so polite and informative. I had Giovani as our representative and he was very informative and professional, and knew exactly what the problem was. Thanks so much.
Response from the owner:Thank you for the kind review, Frank! We appreciate you and your business.
My furnace was not working. A very nice gentleman came out this morning and fixed the problem and now I have much needed heat. He was very professional and courteous. I will definitely be using them again when the need arises.
Response from the owner:Thank you for the positive feedback! We're glad to hear that you were pleased with our prompt and friendly service. We look forward to assisting you again in the future!
I will always call Hoffmans for my air and heat needs. They were out to my daughters house that day and fixed it. It was right before the weekend storm with below zero temps the next day. They saved my daughter and grandbabies. I could never thank them more.
Response from the owner:We are so happy to hear that we could help! Thank you for the kind review.
Snow and drifting snow covered intake and out take vents causing the furnace emergency to shut off furnace. Cleaned off the driftibg/ snow off roof and vents furnace works perfect now. Thank you and great job Nick.
Response from the owner:Thanks for the great review, Scott! We appreciate your support.
5 stars! Nick was here to fix my heater within 2 hours of my call. He explained the problem to me thoroughly and got the job done quickly & professionally. Thank you so much!
Response from the owner:Thank you for the kind review, Jennifer! Glad we could help.
Extremely thorough and educational. They do a wonderful job of explaining everything and making sure I was comfortable knowing how the systems worked in my house!
Response from the owner:Thanks for the great review, Matthew! We appreciate your support.
I noticed a strange noise that I was concerned was linked to my furnace. I called Thomas Hoffman Heating & Cooling and Nick came right out. He was very thorough checking all components. Thankfully all checked out for us this visit. Definitely recommend Thomas Hoffman Heating & Cooling!
Response from the owner:Thank you so much for the kind review, Abby! We appreciate your business and look forward to servicing you in the future.
Thomas Hoffman is a wonderful company to work with. Techs are knowledgeable, personable & efficient.
Response from the owner:Thank you, Christine, for your kind words about our team; we appreciate your feedback and are glad to hear you had a positive experience!
Got a quote over the phone. Everything was explained thoroughly. Dakota, my technician arrived and on time, was very professional and knowledgeable. He didn’t try to upsell or change anything. He did a great job. We can already tell the difference since the ducts and vents were cleaned. Would recommend an use Hoffman again in the future.
Response from the owner:Happy to hear you had a pleasant experience using Thomas Hoffmann!
The technician, Ryan, was knowledgeable and helpful in identifying the issue with our mini split AC unit. They are the second company we called after issues with the first and will be using Hoffmann again.
Response from the owner:We are so happy to hear your experience with Thomas Hoffmann was pleasant. Thank you for your kind review, & we look forward to working with you in the future!
woke up to a very cold house, called Thomas Hoffmann, they were able to come out a couple of hours later and get the issue resolved. Always trust them, they have always been quick to respond and get either the heating or ac issue fixed that day. Also a great price!!!! give them 10 stars if i could, Thank You JS
Response from the owner:Thank you for the kind review, Jim. We are happy to hear that you had a positive experience working with Thomas Hoffmann!
Response from the owner:Thank you, Hank, for your wonderful feedback; we're glad you enjoyed the fast, friendly, and professional service, and we'll be sure to keep up the great work!
The technician Giovanni was excellent and on time very professional and efficient and knowledgeable of the project at hand ,gave great advice but most of all did great work 👏 thank you .
Response from the owner:We are so happy to hear you had a great experience, Sam! Thank you for the review, and thank you for your business.
Your service technician was very professional and knowledgeable. And did not appear to try to give me bogus information. I truly appreciate his honesty because several other companies did not appear to be honest, obviously wasn’t honest, my gut feeling told me they were not honest and tried to get me to spend $10,000 for a problem that was much simpler to fix. I look forward to you servicing all my properties, and possibly those of the rest of my family.
Response from the owner:Thank you so much for the kind words and great review! We appreciate your support.
Common Trane Furnace Problems We Repair
Trane furnaces are built for reliability, but St. Louis winters put real demands on any heating system. These are the most common Trane furnace issues we diagnose and repair:
Furnace not turning on — Often caused by a failed ignitor, pressure switch, or control board.
Furnace blowing cold air — Can indicate a failed flame sensor, gas supply issue, or overheating due to restricted airflow.
Trane fault codes — Trane furnaces use LED flash codes to indicate specific problems. We read, interpret, and resolve the underlying issue — not just reset the code.
Short cycling — If your furnace runs briefly and shuts off repeatedly, it could be overheating, have a faulty flame sensor, or a heat exchanger problem.
No heat or weak heat — Low gas pressure, a dirty burner, or a failing heat exchanger can all reduce heating output.
Loud noises — Banging, rattling, or squealing during operation often points to blower motor issues, loose panels, or delayed ignition.
Limit switch tripping — Usually a sign of restricted airflow or a dirty filter. We find the cause and fix it properly.
Trane Furnace Fault Codes — What They Mean
Most Trane gas furnaces communicate problems through LED blink codes on the control board. Common Trane fault codes point to issues like pressure switch failures, limit switch trips, ignition failures, and inducer motor issues. If your Trane furnace is displaying a fault code and you are not sure what it means, call us — we can walk through it on the phone or send a technician out.
Repair or Replace Your Trane Furnace?
Trane builds furnaces that can last 20 years with proper maintenance. If your system is relatively young and the repair is straightforward, fixing it is almost always the right call. If your Trane furnace is older or facing a major repair like a cracked heat exchanger, we will give you a clear comparison — including what furnace replacement would cost and what a new Trane installation involves.
Frequently Asked Questions — Trane Furnace Repair St. Louis
We service all current and recent Trane gas furnace models including the XC95m, XC80, S9X2, S8X1, and older XB and XT series units. Not sure if we service your model? Just call and we will confirm.
Trane furnaces use a blinking LED on the control board to communicate fault codes. Count the blinks in a sequence — 3 blinks followed by a pause typically indicates a pressure switch fault. Your furnace door panel usually has a code chart. If you can't locate it or are unsure what it means, call us and we can walk you through it.
It depends on the noise. A loud bang at startup can indicate delayed ignition, which should be addressed promptly. Rattling or vibrating sounds are often minor. A persistent metallic scraping sound usually means a blower wheel or motor issue. When in doubt, it is always safer to have a technician look before running the furnace further.
Repair costs depend on the specific problem and parts required. Simple fixes like ignitor replacement or flame sensor cleaning are generally affordable. More involved repairs involving control boards or heat exchangers cost more. We always provide a written estimate before beginning any work.
Contact Thomas Hoffmann Air Conditioning & Heating
Thomas Hoffmann Air Conditioning & Heating is a full-service residential heating and air conditioning company in St. Louis. With over 30 years of experience and a master technician and mechanical engineer as our owner, we can replace, repair, and maintain your home's HVAC system.
24/7 Service Call Now
At Thomas Hoffmann Air Conditioning & Heating, we pride ourselves on being a locally owned and operated HVAC company. With more than 30 years of experience and a master technician and mechanical engineer as our owner, we can replace, repair, and maintain your business or home’s HVAC system.
