Furnace Repair

Is Your Furnace Blowing Cold Air or Refusing to Turn On?

Are your vents blowing completely cold air, is the furnace rapidly clicking without igniting, or do you smell a sharp electrical burning scent when the system kicks on? These are genuine mechanical failures that require professional diagnostics, not something you can safely fix with a quick internet search or a DIY tutorial. Call or text Tellez Heating and Air to restore your heat. We answer calls and texts until about 10 PM most nights.

Warning Signs Your Furnace Needs Immediate Repair

Vents Blowing Cold or Lukewarm Air

When your thermostat calls for heat but you only feel a weak draft of cold air, your blower motor is running but the actual gas burners are failing to ignite. Ignoring this forces the blower to run endlessly, driving up your monthly electric bill and putting massive, unnecessary strain on a motor that will eventually burn out from the continuous workload.

Rapid Short Cycling

If your furnace kicks on for just a minute or two before abruptly shutting down and restarting, the internal limit switch is likely tripping to prevent a dangerous overheating situation inside the cabinet. Allowing this constant starting and stopping will quickly wear out your expensive ignition components and severely stress the heat exchanger until it physically cracks under the pressure.

Loud Booms or Metallic Scraping Noises

A loud boom when the system kicks on indicates delayed ignition, where gas builds up in the combustion chamber before finally catching a spark and creating a small, concussive explosion. High-pitched squeals or loud metallic scraping point to failing bearings or a misaligned blower wheel that will eventually seize the motor entirely if left unaddressed by a professional.

Electrical Burning or Rotten Egg Odors

A metallic, electrical burning smell means internal wires are melting or a motor is actively failing, which could easily cause a dangerous short circuit if the system is not powered down immediately. The distinct odor of rotten eggs is the chemical additive in natural gas, signaling a severe leak at the gas valve or supply line that requires an immediate emergency shut-off.

Yellow or Flickering Burner Flames

Your gas furnace flames should always burn a crisp, steady blue; a lazy yellow or orange flame means the system is not getting the right mixture of gas and oxygen due to dirty burners or a blocked intake pipe. This incomplete combustion produces dangerously high levels of carbon monoxide, which can easily backdraft into your living space if your venting or heat exchanger is even slightly compromised.

Unresponsive Thermostat

When you crank the indoor temperature up but the furnace remains completely silent and unresponsive, you are dealing with a total communication failure between the thermostat, the control board, or the main power supply. This often requires tracing the low-voltage wiring and testing the main control board with a multimeter to pinpoint exactly where the electrical signal is dropping out.

Common Furnace Failures Behind the Symptoms

Dirty or Corroded Flame Sensor

The flame sensor is a tiny metal rod that detects if a fire is actually present, but over time, it becomes coated in stubborn carbon buildup from the natural combustion process. When this happens, the sensor cannot feel the flame and instantly shuts off the gas valve to prevent a dangerous leak, requiring a specialized abrasive cleaning to restore the normal heating cycle.

Cracked Heat Exchanger

Years of extreme temperature swings cause the metal heat exchanger to constantly expand and contract, eventually creating microscopic stress cracks that fatally compromise the entire heating system. This is a critical safety failure because the heat exchanger is the only physical barrier keeping deadly combustion exhaust gases from mixing directly with the breathable air blowing into your home's ductwork.

Blower Motor Failure

Your furnace blower motor works year-round to push both heated and air-conditioned air, and that heavy, continuous workload eventually causes internal bearings to wear out or external capacitors to fail completely. When the motor finally dies, the furnace might ignite but absolutely no air will move through your vents, requiring detailed electrical diagnostics and a complete motor or blower wheel replacement.

Failed Hot Surface Ignitor

Modern gas furnaces use a fragile hot surface ignitor that glows white-hot to light the incoming gas, but this crucial component eventually becomes brittle and cracks from repeated thermal stress over the years. When the thermostat calls for heat, the gas valve clicks open but there is no glow to ignite the fuel, requiring a direct replacement of the fragile element to get the burners firing again.

Tripped High-Limit Switch

The high-limit switch is a vital safety device designed to shut down the burners if the internal temperature of the furnace gets dangerously hot due to severely restricted airflow through the system. A heavily clogged air filter or blocked return vents will consistently trip this switch, and repeated overheating will eventually cause the safety switch to fail permanently in the open position.

What to Expect During Your Furnace Repair Visit

When you call for a furnace repair, you need real solutions instead of guesswork, which is why our technicians start by listening closely to exactly what you heard, smelled, or felt before the breakdown. We run a complete diagnostic on your heating system to find the exact root cause of the failure rather than just treating the most obvious outward symptom. Because we believe in total transparency, we capture photo evidence of every issue we uncover so you can see the exact condition of your equipment with your own eyes.

As a fully licensed, insured, and bonded family business, our priority is always your safety and comfort rather than hitting a high-pressure sales quota. Our technicians will clearly explain your repair options, detailing exactly what you should and shouldn't be paying for to get your system running safely again. We stay on-site until the job is done right, the system is fully tested, and every single one of your questions is answered to your complete satisfaction.

Tellez Heating and Air has been diagnosing and fixing these exact furnace failures since 2009, and we tell you the amount of our flat service fee up front when you call. Call or text us at (918) 809-2017. We answer calls and texts until about 10 PM most nights. You can trust our team to respect your home, work carefully, and stand behind our repairs with our 100% Satisfaction Guarantee.

Furnace Repair Coverage Across the Tulsa Metro

When your heating system fails, you need a reliable technician who can reach your home quickly and properly diagnose the issue. We bring a fully stocked warehouse on wheels and photo-evidence diagnostics to homes throughout the Tulsa area.

Tulsa & North Metro: Tulsa, OK, Owasso, OK

South & East Metro: Broken Arrow, OK, Bixby, OK, Jenks, OK, Coweta, OK

Comprehensive Heating Solutions

While we are diagnosing your immediate furnace breakdown, we often find that the underlying damage is too severe, making a complete heating replacement the safer and more cost-effective option. Conversely, many of the active failures we fix could have been entirely prevented with routine HVAC maintenance to keep the system clean and calibrated. We also evaluate how well your home retains the heat we just restored, as upgrading your attic insulation or servicing your heat pump can drastically reduce the workload on your primary heating equipment.

Get Your Furnace Running Right Again

Living with a malfunctioning furnace is not just incredibly uncomfortable; it can be actively unsafe for your home and your family. Do not wait for a minor ignition issue to escalate into a complete system failure, and never settle for technicians who refuse to show you exactly what they are fixing.

Trust the family that has been keeping local homes comfortable, safe, and warm for well over a decade. Reach out to Tellez Heating and Air today to schedule your furnace repair diagnostic and let us get your heating system back to doing exactly what it is supposed to do.