10 Common Furnace Issues (and When to Call a Pro)

As cooler weather settles over the Okanagan, your furnace shifts into high gear to keep your home or business warm. But even the most reliable heating system can develop issues over time. Some are small problems you can address yourself. Others require the expertise of a licensed HVAC professional to fix safely and properly.

Below, we break down some of the most common furnace issues in British Columbia homes and businesses, along with guidance on what you might try yourself. We also let you know when it’s time to call a pro, as sadly, not everything can be DIY-ed.

1. Clogged Filters

Possible DIY Fix: If your furnace isn’t delivering much heated air, the filter may be clogged with dust, pet hair, or other debris. Turn off your furnace and replace the filter with one that matches your unit’s specifications. In most BC homes, replacing filters every 1–3 months is enough to keep airflow steady.

When to Call a Pro: If you replace the filter and airflow still seems weak, the problem could be deeper in your ductwork or within the blower assembly. A technician can inspect your HVAC system, clear blockages, and check for other airflow restrictions.

2. Ignition or Pilot Light Issues

Possible DIY Fix: On older gas furnace systems, a pilot light that won’t stay lit could be due to dirt on the thermocouple. If you’re confident in safely turning off the gas supply, you can clean the thermocouple with fine steel wool.

When to Call a Pro: Persistent ignition problems, faulty electronic igniters, or repeated pilot light outages can signal gas valve or burner issues. These should always be handled by a licensed HVAC professional for safety and compliance with BC gas regulations.

3. Thermostat Malfunctions

Possible DIY Fix: Before calling for furnace repair, check that your thermostat is set to “heat” and the batteries are fresh. Ensure the programmed temperature is above the current room temperature.

When to Call a Pro: If your thermostat still fails to signal the furnace or causes frequent cycling, a technician can check wiring, recalibrate the device, or recommend a more efficient model that integrates with modern HVAC systems.

4. Blower Belt Problems

Possible DIY Fix: If you hear squealing noises coming from your furnace, it could be a worn or loose blower belt. In some cases, you can visually inspect it (with the power off) and tighten or replace it following the manufacturer’s instructions.

When to Call a Pro: If the belt is frayed, the motor is damaged, or the furnace still won’t circulate heated air after replacing it, it’s time for professional service. Commercial units, in particular, often require specialized belts and installation.

5. Dirty /Faulty Flame Sensor

Possible DIY Fix: If your furnace starts and then shuts off quickly, the flame sensor might be dirty. After turning off the power and gas, you can remove the sensor and clean it gently with fine sandpaper.

When to Call a Pro: If cleaning doesn’t solve the problem, the sensor may need replacing, or there could be issues with the control board. Professionals can also test other safety switches to ensure your furnace is operating securely.

6. Gas Valve Issues

Possible DIY Fix: Unfortunately, gas valve problems aren’t DIY-friendly. There’s no safe homeowner fix for this, as it involves working directly with the gas supply.

When to Call a Pro: If you suspect a faulty gas valve, smell gas, or experience complete heat loss, shut the system down and call a certified HVAC professional immediately. Gas-related repairs must comply with BC safety codes.

7. Heat Exchanger Cracks

Possible DIY Fix: There is no safe at-home repair for a cracked heat exchanger. Your role is to monitor for warning signs such as carbon monoxide alarms, unusual smells, or soot buildup.

When to Call a Pro: Cracked heat exchangers are dangerous and can leak carbon monoxide into your home. This requires immediate attention from a licensed technician, and in most cases, heat exchanger replacement or a full furnace replacement.

8. Safety Switch Tripping

Possible DIY Fix: If your furnace stops and you notice the limit switch has tripped, check for blocked vents or a dirty filter, as these can cause overheating. Clear any obstructions and replace the filter if needed.

When to Call a Pro: Frequent tripping could mean the blower motor is failing, the heat exchanger is damaged, or the system is overheating for other reasons. A professional can test and replace faulty safety switches and identify root causes.

9. Strange Noises

Possible DIY Fix: Light rattling can sometimes be fixed by tightening loose access panels. A small amount of vibration noise is normal, especially in older units.

When to Call a Pro: Grinding, banging, or loud squealing noises can indicate serious issues like motor failure, broken blower belts, or problems with the burners. These require immediate inspection to prevent further furnace damage.

10. Lack of Heated Air

Possible DIY Fix: If your furnace heat isn’t flowing into your home or business, make sure all registers are open and unblocked. Check the thermostat settings and replace the filter.

When to Call a Pro: If your furnace is running but producing little to no heat, there may be issues with the blower motor, burners, or gas supply. In commercial buildings, inadequate heat can also point to zoning or control system problems, which need professional diagnostics.

Why Choose Husky Heating & Cooling for Furnace Repair in the Okanagan

• Local Knowledge: We understand Okanagan winters and the demands they place on residential and commercial HVAC systems.
• Comprehensive Service: From simple furnace repairs to full system overhauls, we handle it all.
• Certified Technicians: Our HVAC professionals are licensed, trained, and up to date on BC safety codes.
• Reliable Response: We offer timely, dependable service so you’re never left in the cold.
• Clear, Honest Pricing: You won’t get any unexpected surprises; you’ll know the cost before work begins.
• Customer Satisfaction: We stand behind our work to ensure your comfort and peace of mind.

Ways to Maintain Your Furnace for a Longer Life

Regular maintenance keeps your furnace running smoothly and reduces the risk of unexpected breakdowns. Here are some practical tips for Kelowna homeowners and business owners to help maintain your furnace and encourage a longer lifespan.

• Replace or clean your filter regularly to avoid making your furnace work harder than it has to.
• Schedule annual professional inspections before winter to make sure everything is working before you’re in dire need.
• Keep vents and registers clear from obstructions.
• Listen for changes in sound that may indicate a developing problem.
• Ensure your thermostat is functioning properly.
• Have safety features like the flame sensor and limit switches tested annually.

Heading into Cooler Weather

Fall is the perfect time to prepare your heating system and book an inspection or tune-up before the cold weather sets in to ensure your unit runs efficiently all season. This not only prevents mid-winter breakdowns but can also lower your energy bills by keeping your system in peak condition.

Closing Thoughts

Knowing the signs of common furnace problems (and when it’s time to call a pro) can save you time, money, and stress. While there are safe DIY fixes for some issues, anything involving gas lines, electrical work, or critical safety features should always be left to a licensed HVAC professional.

If you’re in Kelowna and need expert furnace repair, trust Husky Heating & Cooling to get the job done right. Contact us today to book your service and stay warm all winter long.