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Common Furnace Will Not Ignite Concerns We Repair

When a furnace will not ignite, the cause is usually one of a handful of well-known components. Here are the problems our clients call about most.

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Furnace Ignitor Has Failed

The hot surface ignitor is a fragile ceramic element that glows red-hot to light the burners. Over time it becomes brittle and cracks, breaking the ignition circuit entirely. We test ignitor resistance and replace failed units with compatible parts to restore proper startup.

Furnace Flame Sensor Dirty or Failing

The flame sensor reads whether the burners are lit and shuts the gas valve if it detects no flame. A layer of oxidation on the sensor rod causes false readings, so the furnace lights briefly and then shuts off within seconds. Cleaning or replacing the sensor restores reliable flame detection and keeps the burners running.

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Furnace Stuck in Safety Lockout

After two or three failed ignition attempts, most furnaces lock out automatically to prevent gas buildup. The lockout light or error code on the control board indicates the system needs a manual reset before it will try again. A technician clears the fault, identifies the root cause, and confirms the ignition sequence completes successfully before leaving.

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Furnace Gas Valve Not Opening

If the ignitor glows normally but no flame appears, the gas valve may not be opening to allow fuel to reach the burners. A failed valve coil or a control board not sending the correct signal are both common causes. We test the valve electrically and mechanically to confirm whether it needs replacement.

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Furnace Inducer Motor Not Starting

The draft inducer motor must reach full speed before the control board allows the ignition sequence to begin. A motor that is slow, noisy, or intermittent causes the furnace to stall before the ignitor ever fires. Replacing a worn inducer motor restores the proper pressure conditions the system needs to light safely.

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Furnace Filter Blocking Airflow

A severely blocked air filter prevents enough airflow across the heat exchanger, causing it to overheat and trip the high-limit switch. Once the limit trips, the control board shuts down the ignition sequence as a safety measure. Replacing the filter and resetting the limit switch typically resolves this issue without any parts replacement.

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Furnace Control Board Not Sending Signal

The furnace control board coordinates every step of the startup sequence, including sending voltage to the ignitor and opening the gas valve. A burned relay or cracked solder joint on the board can interrupt this signal without producing any visible damage. We test each output from the board to confirm whether it needs repair or replacement.

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Furnace Won't Start After Power Outage

Power surges and outages can trip internal safety switches or cause the control board to enter a fault-lockout state, leaving the furnace unresponsive even after power is restored. Resetting the furnace manually without checking for underlying voltage damage can cause the board to fail prematurely. We inspect the board, verify all safety switches have reset properly, and confirm stable operation before closing the call.

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Gas Smell When Furnace Tries to Start

A detectable gas odour during a startup attempt can indicate a leaking gas valve, a cracked heat exchanger allowing combustion gases to enter the air stream, or a supply line issue upstream of the furnace. This condition requires immediate attention and the home should be vacated until a licensed gas technician has assessed the system. We carry all required safety equipment and perform a full combustion and leak check before restoring the system to service.

Reviews

What Our Customers Say

★★★★★

Furnace back on same day

Woke up to a cold house and no heat. The technician arrived within a few hours, identified a failed ignitor, and had everything replaced and running before noon. He walked me through what went wrong and what to watch for going forward. Exactly the kind of service you need in January.

★★★★★

Diagnosed the problem in minutes

I had already tried resetting the furnace a few times with no luck. The technician checked the ignition sequence, found a dirty flame sensor, cleaned it, and the burners fired right up. The whole visit took under an hour. Very professional and easy to deal with.

★★★★☆

Solid work, part took an extra day

The technician confirmed the ignitor had failed on the first visit and was upfront that the specific part for my older furnace would need to be ordered. It arrived the next day and the repair was done quickly. A minor wait, but the communication was clear throughout and the furnace has been running perfectly since.

★★★★★

Honest and thorough

I appreciated that the technician explained each step before doing anything. He tested the ignitor and flame sensor, confirmed which one had failed, and gave me a clear price before starting. No surprises. I will be booking the annual service through Winnipeg Service Pros going forward.

★★★★★

Fixed what another company missed

A previous company had replaced the ignitor a year ago but the furnace stopped lighting again. Winnipeg Service Pros found that the real issue was a weak gas valve that had been overlooked. The repair fixed the problem for good. I wish I had called them first.

★★★★★

Professional from start to finish

The technician arrived on time, explained the ignition fault clearly, and had the repair done without any fuss. He also checked the heat exchanger and filter while he was there, which I did not expect. Great value and a company I would recommend to anyone dealing with a no-heat situation.

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