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Common HVAC Technician Problems We Address

These are the heating and cooling problems our technicians are called about most often. Each one gets a proper diagnosis before any repair work begins.

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Furnace Ignitor Not Working

A failed ignitor prevents the burner from lighting, leaving the furnace blowing unheated air or shutting down on a safety lockout after several failed ignition attempts. Continued failed attempts can cause the draft inducer to run continuously, wearing it out faster than normal operation. We test the ignitor resistance, check the ignition control board sequence, and replace the ignitor with a compatible component in a single visit.

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Furnace Pressure Switch Stopping Startup

A pressure switch that trips and prevents furnace operation usually signals a venting restriction, a failing draft inducer motor, or a cracked pressure switch hose that cannot build the required negative pressure. Running a furnace with a venting restriction creates a combustion safety risk. We test inducer output, inspect the flue and exhaust path, and verify pressure switch operation before restoring normal function.

AC Compressor Won't Start

An air conditioner compressor that hums but does not start usually has a failed start capacitor that can no longer supply the starting torque the motor needs. Running the compressor repeatedly against a failed capacitor damages the motor windings over time. We test capacitor microfarad values against rated specs and replace any that are outside the acceptable range, restoring reliable compressor operation.

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Furnace Flame Sensor Dirty or Failing

A coated flame sensor cannot properly confirm that the burner has lit, causing the furnace to shut off the gas supply seconds after ignition as a safety measure. This produces a pattern where the furnace fires briefly and then shuts down repeatedly. We clean or replace the flame sensor rod and test the microamp signal it produces during combustion to confirm the system reads it correctly.

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Heat Pump Not Defrosting in Winter

A heat pump that stays iced over during winter cannot transfer heat efficiently, and if the defrost cycle fails to clear the coil, the system will eventually stop producing useful heat. Defrost failures usually trace to a faulty defrost control board, a failed reversing valve, or a defrost thermostat no longer triggering the cycle correctly. We test the full defrost sequence and replace the component responsible for the failure.

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Zone Control or Thermostat Sending Wrong Signals

A zone control board or thermostat that sends incorrect signals can cause rooms to overheat, others to stay cold, or the entire system to behave unpredictably. These faults are often misdiagnosed as mechanical failures when the system is actually responding correctly to bad input. We trace the signal path from the thermostat through the zone board to the equipment to isolate where the instruction is breaking down.

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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. 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 causing rapid pressure fluctuations. We identify the trigger and correct the source.

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Carbon Monoxide Alarm Going Off

A CO alarm near the furnace should never be dismissed without professional verification. The most common cause is a cracked heat exchanger allowing combustion gases to enter the circulated air. Evacuate the home and call the gas utility before calling for service. We carry all required safety equipment and perform a full combustion analysis and heat exchanger inspection before returning the system to service.

Reviews

What Our Customers Say

★★★★★

Diagnosed in minutes, repaired in an hour

Our furnace was short-cycling and I had already tried replacing the filter with no improvement. The Winnipeg Service Pros technician arrived, listened to how I described the problem, and diagnosed a faulty pressure switch in about ten minutes. He had the part and completed the repair within the hour. That kind of efficiency is exactly what you want in a cold house.

★★★★★

Genuinely knowledgeable, not just guessing

I have dealt with technicians who replace parts until something works and call it a repair. The technician from Winnipeg Service Pros was different. He tested each component methodically, found a failing capacitor causing intermittent compressor issues, and replaced only what was needed. The system has been solid ever since.

★★★★☆

Solid work, appreciated the honest assessment

The technician was straightforward about what he found and what he recommended. One item needed a part that was not on his truck, so a follow-up was needed. Slightly inconvenient, but he was upfront about it and came back promptly the next morning. The repair held and the system has been running well since then.

★★★★★

Handled our heat pump correctly

We had a technician from another company try to fix our heat pump and make things worse. Winnipeg Service Pros sent someone who clearly understood heat pump systems specifically, not just furnaces. He identified the reversing valve issue quickly, explained it without jargon, and completed the repair in one visit. Big difference in quality.

★★★★★

Arrived same day, clean and professional

I called about our air conditioner losing cooling and Winnipeg Service Pros had someone at the house the same afternoon. The technician was tidy, wore shoe covers without being asked, and cleaned up after the work was done. He found a refrigerant leak, repaired it, and recharged the system. A+ for professionalism and quality.

★★★★★

Clear quotes and no surprises on the invoice

The technician gave me a specific quote before starting any work, and the final bill matched exactly what he quoted. No surprise add-ons, no vague line items. He also explained what had caused the problem so I understood what to watch for going forward. That combination of honesty and skill is exactly what I look for in a tradesperson.

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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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