Furnace Repair is what you need when your gas furnace stops heating, blows cold air, cycles nonstop, or makes noises that sound expensive. This page is the main hub for furnace repairs across Metro Vancouver and the Fraser Valley, and we also publish local guides for cities like Vancouver, Burnaby, and Surrey.

If your furnace is still running but needs seasonal upkeep, see Furnace Service. If repairs are no longer worth it and replacement is the smarter move, see Furnace Installation.

Fast “No Heat” Checklist (Before You Call)

Humans love turning one problem into five. Don’t. Do these quick checks first. They take 2 minutes.

  • Thermostat: set to HEAT, raise setpoint 2–3°C, confirm batteries (if applicable).
  • Power: check furnace switch and breaker.
  • Filter: a clogged filter can trip safety limits and stop heat.
  • Vents: confirm at least some supply registers are open.
  • Error code: look at the furnace LED flash code and note it.

If you smell gas, leave the home and follow the safety guidance in the section below.

Emergency Furnace Repair: When It’s Not “Wait Until Morning”

Some furnace problems are comfort issues. Some are safety issues. Treat them differently.

  • Gas smell: stop. Don’t operate switches. Leave and get professional help.
  • Burning electrical smell: shut the system off at the switch if safe to do so.
  • Loud banging at ignition: can indicate delayed ignition or combustion issues.
  • Repeated lockouts: the unit keeps trying and failing, which can worsen damage.
  • Carbon monoxide concerns: headaches, dizziness, nausea, or CO alarm activation.

Gas appliance safety in BC is overseen by Technical Safety BC. If you have any safety concern, don’t “test it one more time.”

Common Gas Furnace Problems We Repair

Most gas furnaces fail in predictable ways. The goal is to diagnose fast, repair correctly, and verify safe operation.

1) Furnace runs but blows cold air

  • Ignition failure (igniter, flame sensor, gas valve control)
  • Flame sensor contamination
  • Pressure switch or venting issue
  • Limit switch trip from airflow restriction

2) Furnace won’t start at all

  • Power, control board, fuse, door switch
  • Thermostat wiring or failed thermostat
  • Safety circuit open (rollout, limit, pressure switch)

3) Short-cycling (starts and stops too often)

  • Dirty filter or blocked return air
  • High static pressure from duct restrictions
  • Oversized furnace or incorrect blower setup
  • Limit switch trips

4) Loud noise: rattling, rumbling, squealing, booming

  • Loose panels or blower wheel imbalance
  • Motor bearings wearing out
  • Duct vibration or poor transitions
  • Ignition issues (booming can be serious)

5) Furnace keeps locking out with an error code

  • Repeated ignition failures
  • Condensate/venting problems (high-efficiency models)
  • Flame proving issues
  • Overheat conditions

Symptoms vs Likely Causes (Quick Guide)

What You Notice Common Likely Causes Why It Matters
No heat, blower runs Igniter, flame sensor, pressure switch, gas control Comfort + safety verification needed
Starts, then shuts off quickly Limit switch trip, airflow restriction, static pressure Overheating can damage the heat exchanger
Clicks but won’t ignite Ignition sequence fault, gas/air proving issue Repeated tries can cause lockout
Loud bang at startup Delayed ignition, burner/ignition issues Don’t ignore. Needs proper diagnosis
Weak airflow Dirty filter, blower issue, duct restriction Can trip safety limits and raise costs

What We Check During a Proper Furnace Repair Visit

Repair is not “swap a part and leave.” A proper repair confirms the system runs safely and reliably after the fix.

  • Diagnostic: fault codes, sequence of operation, thermostat call, safeties.
  • Ignition system: igniter condition, flame sensor, burner operation.
  • Airflow: filter, blower performance, obvious duct restrictions.
  • Venting: intake/exhaust condition (especially high-efficiency units).
  • Electrical: control board outputs, connections, fuses, grounding.
  • Safety verification: confirm stable flame and proper operation under load.

On high-efficiency gas furnaces, condensate routing and drain condition are also common failure points.

Repair vs Replace: When Repair Still Makes Sense

People love asking “should I replace it?” The honest answer depends on age, condition, repair frequency, and performance.

Repair usually makes sense when:

  • The furnace is under ~12–15 years and otherwise in good condition
  • The issue is a single failure (igniter, sensor, capacitor, minor electrical)
  • Airflow and ductwork are not causing recurring limit trips
  • You’ve had stable comfort until recently

Replacement is often smarter when:

  • You’ve had repeated breakdowns in one or two heating seasons
  • Comfort is consistently uneven and cannot be solved with repair
  • Major components are failing (blower motor, control board) and the unit is older
  • You want a planned upgrade instead of emergency calls

If replacement is the better move, use our planning guide here: Furnace Installation.

Decision Factor Repair Lean Replace Lean
Age Newer systems 15–20+ years
Repair history First major issue Repeat calls + repeat parts
Comfort Was good until now Always uneven, noisy, or short-cycling
Safety concerns None Combustion/venting issues suspected

Costs, Timing, and What Changes the Price

Repair cost depends on diagnosis time, parts, and whether the issue is airflow-related or a component failure.

  • Simple fixes: sensors, minor electrical, igniter (often quicker)
  • Mid-level: inducer motor, pressure switch diagnostics, blower issues
  • Complex: repeated lockouts, venting/condensate problems, control logic problems

Best way to control repair cost long-term: keep airflow healthy (filter changes + return air not blocked) and address issues early.

Gas Safety and Code Expectations in BC

Gas furnaces need proper venting and stable combustion. If the system is failing in ways that suggest venting or combustion issues, don’t keep running it.

For gas safety requirements and guidance in British Columbia, visit Technical Safety BC.

Efficiency, Operating Cost, and Rebates

Repair restores performance, but if you’re comparing repair vs upgrade, rebates and operating costs may matter. For current programs and details that can apply to heating upgrades, check FortisBC.

Areas We Serve

We provide gas Furnace Repair across Metro Vancouver and the Fraser Valley, including:

Related Gas Services

Book Furnace Repair

If your gas furnace is down, cycling, or making unsafe noises, don’t guess. Get it diagnosed properly and repaired with safety checks.

Call +1-604-518-4438 to book Furnace Repair.

FAQ – Furnace Repair

Why is my furnace blowing cold air?

Common causes include ignition failure, a dirty flame sensor, pressure switch faults, or overheating limit trips caused by restricted airflow. A proper diagnosis checks the full ignition sequence and safety circuit.

My furnace turns on then shuts off. What causes that?

Short-cycling often happens when the furnace overheats and trips a limit switch. Dirty filters, blocked return air, duct restrictions, and incorrect blower setup are common triggers.

How fast can you respond for furnace repair?

Response time depends on demand and scheduling, but “no heat” calls are treated as urgent. The fastest path is to note the model and error code when you call.

Is a furnace repair safe if I smelled gas?

If you smell gas, don’t run the system. Leave the area and follow proper safety steps. After the situation is safe, a technician can inspect the gas appliance and verify operation.

What is the most common furnace repair?

Ignition-related issues are common: igniters, flame sensors, and airflow-related limit trips. Many failures trace back to airflow problems like clogged filters.

Should I repair or replace my furnace?

If the unit is newer and the problem is isolated, repair usually makes sense. If breakdowns repeat, comfort stays uneven, or major components fail on an older unit, replacement planning is often smarter.

Do you repair high-efficiency gas furnaces?

Yes. High-efficiency systems often need attention to venting, pressure switches, and condensate drainage in addition to standard ignition and airflow checks.

Can poor airflow cause furnace breakdowns?

Yes. High static pressure and restricted return air can cause overheating trips, noisy operation, and shortened component life.