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Furnace error code 4 flashes occur when the blower has failed.
The furnace error code 4 flashes when the blower has failed. Furnace error code 4 flashes can be fixed by checking the blower unit and replacing it if necessary or calling a professional to make repairs.
We don’t need to panic about this error code. There are many reasons for a furnace to display the four flashing error codes. The most common cause is a blown circuit or bad contacts on the furnace switchboard.
To fix this, we need to go through the following steps. First, we must unplug the power and wait for five minutes before plugging it back in. Next, we need to check if there is any dust accumulation around the switchboard, clean it up with a dust cloth if necessary, and then turn on the power again. If none of those steps worked, it might be time for us to call an expert who can come over and fix our furnace issue.
Furnace error code 4 flashes can point out a problem with the gas valve. This valve opens and closes to maintain the desired temperature inside the furnace.
If these valves fail, they will not switch on and off like they are supposed to, leading to temperature swings within the furnace. This could cause damage to your furnace, as well as other parts of your home.
You must schedule a technician's visit if you get this error code to fix it immediately before it becomes a safety hazard for your home.
"Inspections, Installations, Repairs & Maintenance"
What follows is the practical information CANRO shares with Metro Vancouver homeowners about furnaces during in-home consultations. A modern high-efficiency gas furnace in Metro Vancouver operates at 95-98% AFUE, modulating its burner output between 40% and 100% to match demand. Vancouver's mild climate means short, frequent run cycles, which favours variable-speed ECM blowers and two-stage or modulating gas valves.
Heat-pump rebates from BC Hydro, FortisBC and the federal Greener Homes program stack to as much as $11,000+ for eligible Metro Vancouver households, dramatically changing the install-cost math vs. a conventional system. CANRO has worked with furnace systems across Metro Vancouver since 1999, including installations and service calls in Yaletown, South Surrey, Pitt Meadows and Westwood Plateau.
Sizing. Proper furnace sizing requires a Manual J load calculation — most Vancouver homes need 50,000-90,000 BTU, but oversized furnaces short-cycle, accelerate component wear and produce uneven temperatures.
Lifespan. A well-maintained high-efficiency gas furnace lasts 15-20 years in Vancouver. The single biggest factor in lifespan is annual professional servicing — combustion analysis, condensate trap cleaning, and igniter inspection prevent 80% of mid-life failures.
Warning signs. A failing furnace usually announces itself: short-cycling, yellow flame (should be blue), rising gas bills, uneven heating between rooms, banging on startup, or persistent error codes on the control board.
Yes. Annual professional servicing catches 80% of mid-life failures before they cause a no-heat call. It also keeps manufacturer warranties valid — most are voided by missing scheduled maintenance. The service includes combustion analysis, heat-exchanger inspection, flame-sensor cleaning, blower-motor check, condensate-trap clearing, and a full safety test for carbon monoxide.
For Metro Vancouver homes, 95-97% AFUE is the sweet spot — high enough to qualify for FortisBC rebates and capture nearly all available efficiency gains, but without paying a premium for the very last 1-2% from 98% AFUE modulating units. ENERGY STAR-certified models above 95% AFUE are required for current rebate programs.
Two-stage furnaces (high/low burner) are a good fit for most Vancouver homes — they cut short-cycling and run quieter than single-stage units. Modulating furnaces (continuously variable burner output) are worth the premium in larger homes (3,000+ sq ft), homes with significant temperature zones, or homes prioritising the absolute quietest operation.
A typical residential high-efficiency gas furnace installation in Metro Vancouver costs $4,500-$8,500 including the equipment, venting, gas-line work, permit, electrical, and removal of the old unit. Variable-speed and modulating models are at the upper end. CANRO provides three quote tiers (good/better/best) so you can choose the right balance for your home and budget.
Yes — for most Metro Vancouver homes, a cold-climate heat pump alone provides 100% of heating needs down to -10°C. Some homeowners choose a dual-fuel setup (heat pump + small gas furnace as back-up for the rare deep cold snap), but this is rarely necessary in our climate.
Short-cycling typically indicates one of: an over-sized furnace for the home, a dirty flame sensor, a clogged condensate drain triggering shutdown, low gas pressure, a failing limit switch, or a thermostat located in a non-representative spot (in direct sunlight, near a vent). All are diagnosed quickly during a service call.
To book furnace service or get a free written quote for installation, call CANRO at (604) 359-1081 or email info@canroheat.ca. We service all of Metro Vancouver including Yaletown, South Surrey, Pitt Meadows and Westwood Plateau.
This guide was written by the CANRO Heating & Cooling team based on 25+ years of furnace installation, repair and annual service work across Metro Vancouver. Last reviewed May 2026.
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