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We have seen every problem a gas furnace can develop. Here are the issues homeowners call us about most often.

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Furnace Short-Cycling Repeatedly

Short cycling is almost always caused by a dirty flame sensor that cannot confirm a flame is present, triggering an automatic shutdown seconds after startup. Running in this state accelerates wear on the ignitor, heat exchanger, and blower motor. We clean or replace the flame sensor and run a full cycle test to confirm the system completes a proper heating cycle.

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No Heat Despite Furnace Running

When the furnace runs but produces no warm air, the most common causes are a failed hot surface ignitor, a tripped limit switch from overheating, or a blower motor running too slowly to move heated air through the ducts. Continuing to run the unit in this state can overheat the heat exchanger. We diagnose the specific failure point before any parts are replaced.

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Grinding or Banging Sounds

Grinding noises typically point to worn blower motor bearings or debris inside the blower wheel, while banging during startup usually indicates delayed ignition from a dirty burner or gas supply problem. Both issues worsen quickly and can damage adjacent components if left unaddressed. We isolate the source, replace worn parts, and verify the system runs quietly before leaving.

Furnace Will Not Start at All

A furnace that will not start at all can be caused by a tripped breaker, a failed draft inducer motor, a faulty control board, or a pressure switch not closing correctly. Attempting to force the furnace to start without identifying the root cause can damage the ignitor or control board. We trace the fault systematically before recommending any part replacement.

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Furnace Has a Cracked Heat Exchanger

A cracked or compromised heat exchanger allows combustion gases to mix with the air circulating through the home, creating a carbon monoxide risk that may not be visible or immediately detectable. This is one of the most serious furnace repair scenarios and should never be delayed. Our licensed technicians inspect the heat exchanger thoroughly and advise on repair or replacement based on the condition of the system.

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Furnace Blowing Cold Air

Cold air from a furnace usually means the burners are not igniting, the flame sensor is not detecting a flame, or the limit switch has shut the burners off due to overheating from a restricted filter. Running the blower against an unlit burner wastes energy and can mask a more serious problem. We check the ignition sequence, sensor, and airflow in sequence to find the actual cause.

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Thermostat or Control Issues

A malfunctioning thermostat can cause the furnace to heat erratically, cycle at the wrong intervals, or fail to respond to temperature changes entirely. The symptoms often look identical to a mechanical furnace problem, which is why we check the thermostat and wiring as part of every diagnostic. Replacing a thermostat when the furnace is the actual problem leads to unnecessary cost and a repeat service call.

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Gas Bills Rising Without More Usage

A furnace consuming more gas than usual without any increase in heating demand is often running inefficiently due to a dirty burner, restricted airflow, or a combustion problem wasting fuel without producing proportional heat. Left unaddressed, the inefficiency compounds and increases the risk of a mid-season breakdown. We clean and calibrate the combustion system to restore normal operating efficiency.

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Yellow or Flickering Furnace Flame

A healthy gas furnace burner should produce a steady blue flame. A yellow, orange, or flickering flame indicates incomplete combustion, which produces elevated carbon monoxide and reduces heating efficiency. The cause is usually dirty burner ports, low gas pressure, or an air-to-fuel ratio problem. We clean the burners, verify combustion air supply, and check gas pressure to restore a correct, stable flame.

Reviews

What Our Customers Say

★★★★★

Actually asked for our repair history

The technician asked if we'd had this issue before and it turned out we had, twice, with another company. Gas Services Edmonton found the real cause this time. Wish we had called them first.

★★★★★

Credentials checked out immediately

I called two other companies first and neither would confirm insurance details over the phone. Gas Services Edmonton had no problem answering every question I asked before booking.

★★★★☆

Thorough diagnostic, fair price

Took a bit longer than expected because the technician tested everything rather than jumping straight to a guess. Ended up being the flame sensor, cheaper than I feared. Appreciated the thoroughness.

★★★★★

Didn't push replacement on an older furnace

Our furnace is 12 years old and I expected to be told to replace it. The technician explained the repair was straightforward and the furnace had plenty of life left. Honest assessment, genuinely appreciated.

★★★★★

Explained everything clearly

The technician from Gas Services Edmonton walked me through what he tested, what he found, and why before doing anything. First time a repair visit felt transparent instead of confusing.

★★★★★

Kept our warranty documentation in order

I didn't even know our furnace warranty required service records until this visit. They handled the paperwork without me having to ask, which saved us a headache later on.

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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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