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Major Gas Furnace Service Problems We Solve

We have diagnosed and resolved every issue a gas furnace can develop. Here are the problems our clients call us about most often.

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Furnace Short Cycling

Short cycling, where the furnace starts, runs briefly, and shuts off before reaching the set temperature, is most often caused by a dirty flame sensor, an overheating condition from a blocked filter or restricted airflow, or a failing limit switch. Repeated short cycling stresses the heat exchanger and accelerates wear across the control board. We identify the root cause before replacing any component, since short cycling can have several different origins.

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Furnace Has a Cracked Heat Exchanger

A crack in the heat exchanger is one of the most serious faults a gas furnace can develop, because it allows combustion gases including carbon monoxide to enter the airstream that circulates through the home. There is often no visible indication from outside the furnace, and a CO detector may not trigger until the crack has worsened. We inspect the heat exchanger during every service visit and explain the findings clearly if deterioration is found.

Furnace Won't Start

A furnace that does not respond when the thermostat calls for heat may have a failed igniter, a tripped limit switch, a control board fault, or a gas supply interruption. Modern furnaces use an ignition control sequence that provides specific error codes when startup fails, and reading those codes correctly is the fastest path to the right repair. We diagnose the startup circuit systematically rather than replacing components at random.

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Loud Banging or Booming at Startup

A loud bang when the furnace ignites is caused by delayed ignition. Gas accumulates near the burner ports because they are partially blocked with residue, and when the igniter finally fires, the accumulated gas lights all at once. This places significant stress on the heat exchanger with every startup cycle. Cleaning the burner assembly during a service visit typically eliminates the problem.

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Furnace Running But Not Heating

A furnace that is running through its heating cycle but not raising the room temperature adequately may have a blower motor running below full speed, a heat exchanger losing efficiency, or a gas valve not opening to the correct flow rate. Reduced heat output is sometimes gradual enough that homeowners do not notice it until energy bills rise. We measure temperature rise across the heat exchanger and test blower output to locate the cause.

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Furnace Inducer Motor Making Noise

The inducer motor vents combustion gases through the flue before and after the burner fires. A worn inducer motor may produce a loud humming, rattling, or squealing sound, and a failed one will prevent the furnace from starting at all since the control board requires inducer operation before ignition is allowed. We test the motor, check the pressure switch it controls, and replace the assembly when the bearing or winding has failed.

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Furnace Ignitor or Pilot Not Working

Older furnaces with standing pilot systems can experience pilot outages from a worn thermocouple or a contaminated pilot orifice. Newer furnaces with hot surface igniters develop cracks in the igniter element over time, preventing the element from reaching the temperature needed to ignite the gas. We test igniter resistance and thermocouple output to confirm which component has failed before replacing either.

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Furnace Vent or Flue Blocked

A blocked, disconnected, or improperly pitched flue pipe can cause the furnace to lock out on a pressure switch fault, or worse, allow combustion gases to spill into the mechanical room. High-efficiency furnaces with PVC venting can develop condensate blockages where the drain connections have partially clogged. We inspect the full venting path, check pitch and termination points, and clear any obstructions before clearing the furnace for operation.

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Furnace Not Serviced in Over a Year

A furnace that has gone more than a year without professional service may have ignitor degradation, flame sensor buildup, and heat exchanger wear that compound quietly. The risk of a mid-season breakdown or carbon monoxide issue increases with each season skipped. We assess the full system condition and address what needs correction before the heating season begins.

Reviews

What Our Customers Say

★★★★★

Thorough service, great communication

Had the furnace serviced before summer so it would be ready for fall. The technician was thorough, explained what he was checking and why, and flagged that the flame sensor was getting worn. Had it replaced on the spot. Very glad I booked early.

★★★★★

Found a problem I did not know about

Booked an annual service and the technician discovered early-stage cracking on the heat exchanger. He explained the risk clearly and gave me options. I appreciated the honesty rather than just completing the service and leaving. Scheduling a replacement now while it is not an emergency.

★★★★☆

Professional visit, slight scheduling delay

The technician was knowledgeable and did a complete job. Getting an appointment during peak booking season took a few extra days, which I understand. The service itself was well done and the furnace ran great all winter. Would book again.

★★★★★

Furnace is running like new

Our furnace was short cycling and I was worried we were looking at a replacement. The technician cleaned the flame sensor and checked the pressure switch, which was sticking slightly. Both fixed in one visit and the furnace has been running perfectly since. Saved a lot of stress and money.

★★★★★

Came out fast and fixed it right

Furnace stopped working on a cold January morning. Winnipeg Service Pros had someone out within a few hours. The igniter had failed and was replaced the same visit. The technician was calm, efficient, and explained exactly what had happened. Could not have asked for better service.

★★★★☆

Solid work and fair pricing

Called for an annual service that was a couple of years overdue. The technician took extra time to clean through the buildup and did not rush. He was clear about what the service covered and what the cost would be before starting. Happy with the result and will be booking yearly going forward.

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From gas furnaces and fireplaces to pool heaters and tankless water heaters, our certified technicians keep your home safe, warm, and running right.

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