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Common Laars fault codes with what each means, the likely cause, and what CANRO Heating & Cooling does to fix them. Servicing Laars systems across Metro Vancouver since 1999.
Laars Mascot FT firetube and NeoTherm commercial condensing boilers use the Honeywell SOLA combustion control — same error code architecture as Triangle Tube Prestige. Most codes are diagnostic guidance rather than immediate hard faults.
Important: One reset attempt is generally safe for transient faults. If the same code returns within minutes, stop resetting — the lockout exists to protect the heat exchanger, ignition system, and gas-valve safety circuit. Note the exact code and call CANRO at (604) 359-1081. We carry common Laars parts in every truck — most code-triggered faults are resolved in a single visit.
What it means: Boiler has reached a safety lockout requiring manual reset.
Common causes: Various — display shows specific cause (ignition, flame loss, combustion air, high limit, low water).
What to do: One reset; persistent codes need service.
Reset guidance: one reset OK
What it means: Flame rod fouling, ignitor, gas valve, gas pressure.
Common causes: Standard ignition service.
What to do: one reset OK
Reset guidance: no
What it means: Dirty flame rod, condensate, low gas.
Common causes: Flame rod clean typical.
What to do: one reset OK
Reset guidance: no
What it means: Low flow, scaling, isolation valve closed.
Common causes: Service required.
What to do: no
Reset guidance: POSSIBLY
What it means: Leak.
Common causes: Top up; locate.
What to do: top up
Reset guidance: no
What it means: Vent issue, fan, APS.
Common causes: Service required.
What to do: no
Reset guidance: no
What it means: Failed sensor.
Common causes: Sensor swap.
What to do: one reset OK
Reset guidance: no
What it means: Gas valve.
Common causes: Service.
What to do: no
Reset guidance: no
What it means: Conditions like pump prove, vent purge, anti-cycle.
Common causes: Usually self-clear; persistent service.
What to do: varies
Reset guidance: no
Note the exact code on your display, then call CANRO. Most Laars faults are diagnosed and repaired on the first visit because we stock common Laars service parts in every truck.
📞 Call (604) 359-1081 nowCANRO services Laars firetube condensing boilers (residential and commercial) in every Metro Vancouver city — including same-day emergency response for no-heat, no-hot-water, and gas-leak situations. See our city-specific Laars pages:
→ See the full Laars lineup hub page with every model, specs, and install costs
This Laars error code guide is maintained by the CANRO Heating & Cooling team based on 25+ years of Laars install, service, and repair experience across Metro Vancouver. Codes and behaviour described match current model manuals. Last reviewed May 2026.
Selecting and servicing HVAC systems in Metro Vancouver involves several local factors — climate, available rebates, code requirements — covered below. Laars is American (New Hampshire, founded 1948), best known for its Mascot FT residential combi boiler and NeoTherm light-commercial boilers. The brand's strengths are firetube heat-exchanger technology, robust commercial heritage applied to residential, strong turn-down ratio.
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 Laars systems across Metro Vancouver since 1999, from older retrofits in Deep Cove and Norgate to new builds in Thompson and Port Coquitlam. Laars is generally a strong fit for larger residential installs needing higher BTU and homeowners wanting near-commercial build quality.
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 Laars service calls across Metro Vancouver, the recurring issues we see are: condensate-trap obstructions, flow-sensor wear on older Mascot units, blocked secondary heat exchanger from poor water quality.
Parts availability. Laars parts are stocked through the same wholesalers as Bradford White; repairs are typically next-day.
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.
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.
To book Laars 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 Deep Cove, Norgate, Thompson and Port Coquitlam.
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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