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Most heating and cooling failures trace back to a small set of components. Here are the problems our clients call us about most often.

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Furnace Starts Then Shuts Off

This almost always points to a safety control responding to a real condition: a dirty flame sensor, a blocked pressure switch port, a restricted flue, or a tripped high-limit switch from restricted airflow. Ignoring it and resetting the system repeatedly can mask the underlying cause while the system accumulates fault lockouts. We diagnose the specific trigger and repair the source rather than simply clearing the fault code.

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Air Conditioner Blowing Warm Air

Warm air from a running air conditioner usually means the refrigerant charge is significantly low due to a leak, the compressor is failing to build pressure, or a reversing valve on a heat pump is stuck in heating mode. Adding refrigerant without finding the leak is a temporary fix that fails within the same season. We locate the leak source, repair it, and recharge to the correct specification.

HVAC System Not Turning On at All

A completely unresponsive HVAC system can stem from a tripped circuit breaker, a failed contactor, a dead control board, or a safety lockout triggered by an earlier fault. Each of these requires a different repair path and should not be assumed from a quick visual check. Our technicians test voltage at each stage of the control circuit to identify exactly where power is being lost.

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Loud Grinding or Banging Noise

Grinding from a blower motor or outdoor fan motor indicates bearing failure, which will lead to a seized motor if left unaddressed. A banging sound at furnace startup often points to delayed ignition causing a small gas buildup before the burners fire. Both conditions get worse with continued operation and should be repaired before they damage surrounding components.

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Heat Pump Running Constantly

A heat pump that runs without cycling off in moderate outdoor temperatures is usually either undersized for the space, low on refrigerant, or operating with a defrost control issue that is keeping it in heating mode. Constant operation accelerates compressor wear and significantly increases energy consumption. We test refrigerant charge, defrost timing, and outdoor temperature sensor function to identify the cause.

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Carbon Monoxide Alarm Triggering

A carbon monoxide alarm responding to a running furnace is a serious condition that should not be dismissed as a false alarm without investigation. The most common causes are a cracked heat exchanger, a blocked or deteriorating flue, or backdrafting caused by pressure imbalances in the home. We perform a combustion analysis and heat exchanger inspection to identify the source and determine the appropriate repair.

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Thermostat Not Responding Correctly

A thermostat that is misreading temperature, failing to trigger the system, or displaying error messages may need calibration, wiring correction, or replacement. However, thermostat problems are also frequently misdiagnosed when the real fault lies in the system's control board or a wiring issue between components. We test the thermostat's output signals alongside the system's response before concluding it is the source.

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Furnace Blowing Cold Air

A furnace that runs but delivers cold air usually has a failed igniter, a tripped high-limit switch from restricted airflow, or a gas supply issue preventing combustion. Running the blower without heat accelerates wear on the motor and does nothing to warm the home. We check the ignition sequence, flame sensor, limit controls, and gas valve to restore proper heating.

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HVAC System Short Cycling

A system that turns on and off every few minutes without completing a full cycle is usually responding to a safety condition rather than reaching temperature. On a furnace, this often means a tripped high-limit switch from restricted airflow. On a cooling system, short cycling points to an oversized unit or a refrigerant issue. We identify the trigger and correct it at the source.

Reviews

What Our Customers Say

★★★★★

Found the real problem fast

Our AC was blowing warm air and I assumed it needed a full recharge. The technician from Gas Services Edmonton found a bad capacitor in under twenty minutes and had it swapped before I even finished making coffee. Way less expensive than I braced myself for.

★★★★★

Came out during the heat wave

Our AC died on one of the hottest days of the summer and Gas Services Edmonton still got someone out same day. The tech was upfront about the compressor being on its last legs and gave us honest options instead of just pushing a repair.

★★★★☆

Good fix, part took an extra day

The diagnosis was spot on right away, a fan motor had seized up, but the replacement had to be ordered so we waited one more day than expected. Once the part arrived the install was quick and everything has run perfectly since.

★★★★★

Honest about repair vs replace

I expected to be sold a new furnace but the technician ran the numbers with me and explained a $250 repair made way more sense for a system that was only six years old. Refreshing to deal with someone who wasn't just chasing a bigger sale.

★★★★★

Caught the heat exchanger crack

The furnace seemed fine to us but the technician found a cracked heat exchanger during a routine repair call for something unrelated. Genuinely could have been dangerous if it went unnoticed. Grateful they check the whole system, not just the one complaint.

★★★★★

No surprise charges on the bill

Gas Services Edmonton quoted the diagnostic fee upfront and it went straight toward the repair cost once we approved the work. The whole visit took about an hour and the technician explained exactly what failed and why before touching anything.

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