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Common Heating System Repair Troubles We Correct

Heating failures follow predictable patterns. Here are the problems homeowners call us about most and what we do to fix them correctly.

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Furnace Starts Then Shuts Off

A furnace that ignites and then shuts off within seconds is usually tripping a safety control because the flame sensor cannot confirm ignition, the igniter is too weak to light the burners reliably, or a pressure switch is failing to close. Attempting to override the safety lockout to keep it running can cause further damage. We test each component in the startup sequence to identify the specific failure before replacing anything.

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Furnace Running But No Heat

A furnace that runs but produces no heat is often dealing with a failed heat exchanger that has caused the furnace to shut off combustion while continuing to run the blower, or a gas valve that is not opening. This is a repair that requires a proper diagnosis because the cause and the safety implications differ significantly between the two possibilities. We check combustion, gas pressure, and control signals before recommending a repair path.

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Heat Pump Blowing Cold Air in Heating Mode

A heat pump blowing cold air in heating mode is almost always caused by a stuck reversing valve that cannot switch from cooling to heating position, or a refrigerant charge that has dropped below effective operating range. Both cause identical symptoms but require different repairs. We test the reversing valve electrically and check refrigerant charge before recommending which issue is responsible.

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Boiler Losing Pressure

A boiler that repeatedly loses pressure has either a leak somewhere in the system or a failed expansion tank that is no longer absorbing pressure fluctuations properly. Continually topping up the pressure without finding the cause accelerates corrosion and damages the boiler's pressure relief valve over time. We locate the source of pressure loss and address it correctly rather than just recommending a refill.

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Heating System Making New Sounds

Banging, rattling, squealing, and grinding from a heating system each point to different faults: loose ductwork, worn blower bearings, a failing inducer motor, or delayed ignition producing a small gas buildup before the burners light. Each is repairable at the stage when the sound first appears, and most become more expensive if the system continues to run. We diagnose the sound source and correct the mechanical cause.

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High Energy Bills From Heating System

A heating system that is consuming significantly more energy than it used to is usually working harder to compensate for a developing fault: low refrigerant in a heat pump, a partially clogged burner in a furnace, or a zone valve stuck open in a boiler system. The system produces the same amount of heat but uses more fuel or electricity to do it. We identify the efficiency loss and correct the underlying cause.

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Furnace Short Cycling Too Frequently

A furnace that turns on and off every few minutes rather than completing full heating cycles is short-cycling, which can be caused by an oversized unit, a restricted filter, a failing limit switch, or poor thermostat placement near a heat source. Short-cycling increases wear on the heat exchanger and blower motor and should be corrected rather than accepted as normal. We check all contributing factors and address the root cause.

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Carbon Monoxide Alarm Going Off

A CO alarm triggered near the furnace or heating system is a serious safety event that requires immediate evacuation and professional inspection before the system is used again. The most common cause is a cracked heat exchanger allowing combustion gases to enter the circulated air supply. We carry all required safety equipment and perform a full combustion analysis and heat exchanger inspection before returning any system to service.

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Furnace Not Starting in Cold Weather

A furnace that fails to start during cold weather is most often in a safety lockout triggered by a failed igniter, flame sensor, pressure switch, or limit switch fault. In below-freezing temperatures, a heat loss situation can put pipes at risk within hours. We diagnose the specific trigger before attempting any restart so the repair addresses the actual fault rather than just clearing the lockout code.

Reviews

What Our Customers Say

★★★★★

Furnace repaired same day

Our furnace stopped working on a January morning and Winnipeg Service Pros had a technician at our home within a few hours. He diagnosed a failed igniter, replaced it, and had the heat running before noon. The price was fair and the technician was clear about what he found and what he did. Could not have asked for more.

★★★★★

Honest diagnosis, no unnecessary parts

I called Winnipeg Service Pros after another company told me I needed a new control board. The technician from Winnipeg Service Pros tested the board and found it was fine. The actual problem was a faulty pressure switch. The repair cost a fraction of what I had been quoted and the furnace has worked perfectly since.

★★★★☆

Good repair, had to wait for part

The technician correctly diagnosed a failed inducer motor on the first visit and was upfront that the part needed to be ordered. It took two days, which was slightly longer than hoped, but Winnipeg Service Pros called to update us and returned the same day the part arrived. The repair was done cleanly and the furnace is quiet now.

★★★★★

Heat pump issue resolved properly

Our heat pump was not defrosting in cold weather and Winnipeg Service Pros correctly identified a failed defrost control board rather than guessing at a refrigerant problem. The repair was done in one visit and the system has handled cold weather well ever since. Appreciated that they took the time to diagnose rather than just replacing the most expensive part.

★★★★★

Boiler repaired and explained thoroughly

Our old boiler was making a loud kettling noise and losing pressure. Winnipeg Service Pros identified a limescale buildup issue and a failing expansion tank. The technician explained both problems clearly before starting any work and the repair resolved both issues completely. The system has been quiet and holding pressure ever since.

★★★★☆

Reliable and transparent service

Winnipeg Service Pros repaired our furnace after a flame sensor failure and the visit was organized and efficient. I appreciated the clear explanation of what was causing the problem and the honest answer about whether the rest of the system was in good shape. Minor scheduling wait of a day, but the repair itself was handled well.

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