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The Lennox system uses error codes to identify potential issues with the Lennox compressor, Fan motor, condenser, blower motor and temperature sensor. Each code is used to provide more detail on what the issue is and how it can be fixed.
Lennox air handler error codes make it much easier to troubleshoot and repair an air handler. When a technician needs to troubleshoot a problem with a Lennox furnace, he or she can use the codes rather than having to search for the specific part number on the unit.
Lennox has included basic troubleshooting guides in their air handler manuals to make troubleshooting easier. These guides list all of the possible error codes generated by your furnace and what they mean.
A new air handler needs to be serviced before it is installed. The error codes of an air handler can help its owner to identify the issue.
An air handler carries out three main functions; heating, cooling, and ventilation. If any of these functions stop working, this will indicate a fault with the unit.
The most common error code that Lennox air handlers are programmed to produce is 11, which stands for compressor overload.
"Inspections, Installations, Repairs & Maintenance"
What follows is the practical information CANRO shares with Metro Vancouver homeowners about HVAC systems during in-home consultations. Lennox is American (Iowa, 1895), best known for its SLP99V variable-capacity gas furnace (up to 99% AFUE) and the XC25 air conditioner. The brand's strengths are industry-leading variable-capacity modulation, premium build quality, top-rated for quiet operation.
BC's building code, TSBC gas-fitting rules, and FortisBC's natural-gas service standards together govern every HVAC installation in Metro Vancouver — CANRO works under permit and inspection on every gas-appliance install. CANRO has worked with Lennox systems across Metro Vancouver since 1999, from older retrofits in Point Grey and Eagle Ridge to new builds in Lynn Valley and Eagle Ridge. Lennox is generally a strong fit for mid-to-upper Vancouver homes wanting maximum efficiency and the quietest possible system.
Sizing. Right-sized HVAC equipment delivers comfort, efficiency, and long lifespan. Over-sized equipment short-cycles; under-sized equipment runs constantly and fails early.
Lifespan. Most modern HVAC equipment lasts 12-20 years in Vancouver's mild climate. Annual maintenance is the single biggest factor in extending lifespan and preventing emergency failures.
Warning signs. Common HVAC warning signs: rising energy bills, uneven heating/cooling, unusual noises, persistent error codes, frequent on-off cycling, or visible condensation on registers.
Over 25+ years of Lennox service calls across Metro Vancouver, the recurring issues we see are: flame-sensor fouling on older units, control-board failures on iComfort thermostats, blower-wheel ECM motor failures.
Parts availability. Lennox parts are dealer-network only — independent shops often struggle to source within 48 hours, but CANRO maintains a Lennox parts pipeline.
Yes. CANRO holds a TSBC Class-A gas-fitting licence, our technicians are Red Seal certified for HVAC, and we carry full liability insurance plus WorkSafeBC coverage.
Annual servicing is recommended for every gas-fired appliance (furnace, boiler, hot-water tank, fireplace) and every cooling system (A/C, heat pump). Annual maintenance is also required to keep most manufacturer warranties valid.
Typical service life with annual maintenance: gas furnace 15-20 years, gas boiler 15-20 years (cast-iron 25-30), heat pump 15-20 years, central A/C 12-15 years, hot-water tank 8-12 years, tankless water heater 18-22 years, gas fireplace 20-30 years.
CANRO provides installation, repair, annual servicing and parts replacement for boilers, gas furnaces, heat pumps, hot-water tanks, tankless water heaters, gas fireplaces, central air conditioning, ductless mini-splits and gas-fitting services across Metro Vancouver.
General rule: if the equipment is more than 75% of its expected life AND the repair cost is more than 50% of replacement, replacement is usually the better investment because new high-efficiency equipment pays back the difference in energy savings over 5-10 years.
Yes. CANRO works with stratas across Metro Vancouver on common-area HVAC (boilers, makeup-air units, A/C towers) and in-suite systems. We provide signed work orders and detailed invoicing suitable for strata reporting and reserve-fund planning.
To book Lennox HVAC system 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 Point Grey, Eagle Ridge, Lynn Valley and Eagle Ridge.
This guide was written by the CANRO Heating & Cooling team based on 25+ years of HVAC system installation, repair and annual service work across Metro Vancouver. Last reviewed May 2026.
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25+ years keeping Metro Vancouver homes comfortable. Honest advice, upfront pricing, work that lasts.