Power vent systems are reliable, but like any mechanical component, they can develop issues over time. Here are the most common problems our technicians are called in to repair:

Blower Motor Failure

The blower motor (or inducer motor on a furnace) is the heart of any power vent system. When it fails, the appliance typically shuts down entirely as a safety precaution. Signs of a failing blower motor include loud rattling or grinding noises before shutdown, the unit attempting to start and then cutting off, or a complete loss of heat or hot water with no obvious cause. This is one of the most common emergency calls we receive, and our technicians carry replacement motors for the most popular brands on every service vehicle.

Pressure Switch Failure

The pressure switch monitors the airflow produced by the blower to confirm safe venting conditions before allowing the burner to ignite. A faulty pressure switch — or one that’s tripped due to a blocked vent, a cracked hose, or condensation buildup — will prevent the system from firing up at all. This is a particularly common issue in Ontario winters when exterior vent caps can ice over.

Blocked or Frozen Vent Pipe

Power vent systems vent horizontally through an exterior wall, which means the outdoor termination cap is exposed to the elements. In Ontario winters, snow buildup, ice formation, or even bird nests can block the vent pipe entirely. When the vent is blocked, the pressure switch trips and the unit shuts down — a safety feature that protects your home but leaves you without heat or hot water until the blockage is cleared and the system is safely restarted.

Cracked or Disconnected Vent Pipe

PVC and ABS vent pipes can crack, separate at joints, or become dislodged over time — especially if they were improperly installed or have been subjected to physical impact. A compromised vent pipe can allow combustion gases to leak into your home, which is a serious safety concern. If you smell exhaust fumes near your water heater or furnace, shut the unit off and call us immediately.

Condensate Drain Issues (High-Efficiency Units)

High-efficiency condensing appliances produce condensate (water) as a byproduct of the combustion process. If the condensate drain line becomes blocked or frozen, water can back up into the system and trigger a shutdown. This is a particularly common issue during Ontario’s deep winter months when condensate lines that run through unheated spaces can freeze solid.

Ignition and Burner Problems

A power vent system that runs its blower but fails to ignite may have a faulty igniter, a dirty or failed flame sensor, or a gas supply issue. Our technicians use diagnostic equipment to pinpoint the exact cause quickly, so you’re not waiting around while they guess.

Control Board Malfunctions

The control board is the brain of your power vent appliance. It manages the ignition sequence, monitors safety sensors, and controls blower timing. A failed control board can produce a wide variety of symptoms — from erratic operation to complete shutdown. We carry diagnostic tools and replacement boards for the major brands we service.

Most modern power vent water heaters and furnaces display diagnostic error codes when something goes wrong. While specific codes vary by brand and model, here are the most common categories and what they typically indicate:

• Pressure switch fault: The blower is not generating sufficient airflow. Could indicate a blocked vent, a faulty blower motor, a stuck pressure switch, or a cracked pressure hose.
• Ignition lockout: The unit attempted to ignite multiple times and failed. Could indicate a faulty igniter, gas supply issue, or dirty flame sensor.
• Flame sensor fault: The burner ignited but the flame sensor did not detect a flame. Often caused by a dirty or corroded sensor — a quick and inexpensive fix.
• High limit fault: The unit overheated and the high-limit safety switch tripped. Could indicate a restricted vent, dirty filter, or failing heat exchanger.
• Condensate fault (high-efficiency units): The condensate drain is blocked or the condensate sensor has detected a problem. Common in winter when drain lines freeze.

Not sure what your error code means? Call us and read the code to our technician over the phone. We’ll tell you exactly what it indicates and whether you need an emergency service call or a simpler fix.

Ontario winters are unforgiving. When temperatures drop to −20°C or lower — as they routinely do across the GTA, Ottawa, Hamilton, and Barrie — a failed heating system is not a minor inconvenience. It’s a genuine risk to your family’s safety and your home’s structure.

Without heat, you face:

• Frozen pipes: Water pipes can begin to freeze within hours in an unheated home during an Ontario winter. Burst pipes mean costly water damage on top of the repair bill.
• Health risks: Young children, seniors, and anyone with health conditions are especially vulnerable to exposure in cold indoor temperatures.
• Damage to your home: Extended cold indoors can damage drywall, flooring, and other structural components — especially in older homes.

This is exactly why we offer true 24/7 emergency repair service — not an answering machine, not a next-morning callback. A real technician, dispatched to your home, any time you call.

We’ve designed our emergency repair process to get your system back up and running as fast as possible, with no confusion and no surprises.

1. Call us anytime: Dial 1 (888) 675-5907 and speak directly with our team. Describe what’s happening and we’ll dispatch a licensed technician to your address.
2. Fast arrival: Our technicians are positioned across the GTA and Ontario to minimize response times. We’ll give you an estimated arrival window when you call.
3. Accurate diagnosis: Our technicians use professional diagnostic equipment to identify the exact cause of the failure — not guesswork. We explain what we find in plain language before recommending any repair.
4. Upfront pricing: You’ll receive a clear quote for the repair before any work begins. No hidden fees, no surprise charges on the final invoice.
5. Repair or replacement recommendation: If the repair cost approaches the cost of a new unit, we’ll tell you honestly. We’ll explain the pros and cons of both options so you can make the right decision for your home and budget.
6. Work completed and tested: Once the repair is done, we test the full system — blower operation, pressure switch confirmation, ignition, and exhaust flow — before we leave your home.

Our technicians are trained and certified to repair power vent systems across all major brands. Whether you have a Lennox furnace, a Rinnai tankless water heater, or a unit from any of the manufacturers below, we have the expertise and parts to fix it:

• Lennox
• American Standard
• Rinnai
• Bosch HVAC
• Daikin
• Carrier
• Bryant
• Goodman
• Rheem
• Bradford White
• And many more. If you’re unsure whether we service your brand, call us — chances are we do.

This is one of the most important questions to get right, and it’s one our technicians are trained to help you answer honestly. Here’s a general framework:

Repair Makes Sense When:

• The unit is less than 8 to 10 years old
• The repair is a single, clearly identified component failure (e.g., blower motor, pressure switch, flame sensor)
• The repair cost is well below 50% of the cost of a new unit
• The unit has been well maintained and has no history of recurring failures

Replacement Makes More Sense When:

• The unit is 10 years old or older (water heater) or 15+ years old (furnace)
• You’ve already repaired the same system multiple times in the past two to three years
• The repair cost exceeds 50% of the cost of a comparable new unit
• A new unit would qualify for Ontario government rebates, significantly reducing your net replacement cost
• The technician identifies additional wear or damage beyond the presenting failure

We will always give you both options with honest pricing for each — and we’ll never push you toward a replacement you don’t need. Our goal is the right solution for your home, not the most expensive one.

Constant Home Comfort provides 24/7 emergency power vent repair across a wide service area throughout Ontario, including:

• Toronto and North York
• Mississauga and Brampton
• Vaughan, Richmond Hill, and Thornhill
• Markham and Scarborough
• Newmarket and Aurora
• Barrie and surrounding areas
• Hamilton and Burlington
• Waterloo and Kitchener
• London, Ontario
• Ottawa and Kanata
• And communities throughout the GTA and Ontario

Not sure if we cover your area? Call us at 1 (888) 675-5907 and we’ll confirm availability for your address right away.

The best emergency repair is the one you never need. Here’s how to reduce the risk of a sudden power vent failure:

• Schedule annual maintenance: An annual inspection by a licensed technician catches worn components — like a weakening blower motor or a cracking vent hose — before they cause a breakdown.
• Check your exterior vent cap every winter: After snowstorms, quickly check that the vent termination on your exterior wall is clear of snow and ice. A blocked vent is one of the most common causes of winter power vent shutdowns.
• Don’t ignore unusual sounds: Rattling, humming, or grinding from your blower motor is an early warning sign. Addressing it early is far less expensive than a full emergency call after a complete failure.
• Replace furnace filters on schedule: A clogged filter forces the system to work harder, puts extra strain on the blower motor, and can trigger high-limit faults that shut the unit down.
• Enroll in a maintenance plan: Constant Home Comfort’s maintenance and protection plans include scheduled annual inspections, priority service, and discounts on repairs — giving you peace of mind year-round.

How quickly can a technician arrive for an emergency repair?

Response times vary based on your location and current call volume, but we prioritize emergency heating calls and aim to have a technician at your door as quickly as possible — often within a few hours. When you call, we’ll give you a realistic arrival estimate right away.

Is there an extra charge for after-hours or weekend service?

We are transparent about our pricing, including any after-hours rates that may apply. Our team will advise you of any applicable fees before we dispatch a technician, so there are never any surprise charges on your invoice.

My power vent keeps shutting off and restarting. Is that an emergency?

A power vent system that cycles on and off repeatedly — short-cycling — is telling you something is wrong. It’s not always an immediate emergency, but it should be addressed promptly. Short-cycling puts extra stress on the blower motor and other components, and the underlying cause (a faulty pressure switch, a partially blocked vent, or a failing flame sensor) will typically get worse, not better, on its own. Call us and describe what you’re seeing.

Can I clear a frozen vent pipe myself?

If you can safely access the exterior vent cap and can see that it is blocked by snow or ice, carefully clearing the obstruction may allow the system to restart. Never use an open flame to thaw a vent pipe. However, if the system still won’t start after the vent cap is clear, or if you cannot safely access the termination point, call us. There may be ice further inside the pipe or a secondary issue causing the shutdown.

What should I do while waiting for the technician to arrive?

If your furnace is down in cold weather, layer up, move to a warmer area of the home, and if temperatures are extreme, consider having vulnerable family members (young children, seniors) stay with neighbours or family temporarily. Do not use gas stoves, barbecues, or portable propane heaters indoors to compensate for lost heat — these are serious carbon monoxide hazards. A properly used electric space heater in a well-ventilated area can provide temporary warmth while you wait.

Don’t wait, don’t guess, and don’t let a cold night turn into a household emergency. Our licensed technicians are standing by 24 hours a day, 7 days a week — ready to diagnose and repair your power vent system fast, with honest pricing and no surprises.

🚨 Emergency repair line: 1 (888) 675-5907

💻 Book a service call online: constanthomecomfort.com

📅 Maintenance plans available: Ask about our protection plans to prevent the next emergency before it happens.

Serving Toronto, GTA, Hamilton, Ottawa, Barrie, and all of Ontario — any time you need us.