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Common Weil-McLain fault codes with what each means, the likely cause, and what CANRO Heating & Cooling does to fix them. Servicing Weil-McLain systems across Metro Vancouver since 1999.
Weil-McLain Evergreen, Ultra, GV90+ and modern Slim/CG units display error codes via LED patterns or LCD screens. Heritage cast-iron units (CG/EG/PEG) don't have error codes per se — diagnostic is by inspection.
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 Weil-McLain parts in every truck — most code-triggered faults are resolved in a single visit.
What it means: Boiler has detected a safety fault requiring manual reset.
Common causes: Ignition, flame, combustion air, high limit.
What to do: One reset; persistent service.
Reset guidance: one reset OK
What it means: Flame rod, ignitor, gas pressure.
Common causes: Standard service.
What to do: one reset OK
Reset guidance: no
What it means: Dirty flame rod, condensate.
Common causes: Cleaning.
What to do: one reset OK
Reset guidance: no
What it means: Low flow, scaling.
Common causes: Service.
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 obstruction.
Common causes: Inspect vent.
What to do: no
Reset guidance: no
What it means: Failed sensor.
Common causes: Swap.
What to do: one reset OK
Reset guidance: no
What it means: Atmospheric units; faults show as no fire, soot, banging, no flame.
Common causes: Pilot system, thermocouple, gas valve.
What to do: Service-only diagnostic.
Reset guidance: varies
Note the exact code on your display, then call CANRO. Most Weil-McLain faults are diagnosed and repaired on the first visit because we stock common Weil-McLain service parts in every truck.
📞 Call (604) 359-1081 nowCANRO services Weil-McLain American boilers — cast-iron heritage and modern condensing in every Metro Vancouver city — including same-day emergency response for no-heat, no-hot-water, and gas-leak situations. See our city-specific Weil-McLain pages:
→ See the full Weil-McLain lineup hub page with every model, specs, and install costs
This Weil-McLain error code guide is maintained by the CANRO Heating & Cooling team based on 25+ years of Weil-McLain install, service, and repair experience across Metro Vancouver. Codes and behaviour described match current model manuals. Last reviewed May 2026.
If you are considering HVAC systems, this guide walks through the key technical and practical points specific to Metro Vancouver. Weil-McLain is American (Indiana, 1881), best known for its Evergreen condensing gas boiler and the heritage cast-iron Ultra series. The brand's strengths are cast-iron tradition for very long-life hydronic installs, condensing models for new builds, broad BC presence.
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 Weil-McLain systems across Metro Vancouver since 1999, from older retrofits in Port Coquitlam and Westwood Plateau to new builds in Ladner and Pitt Meadows. Weil-McLain is generally a strong fit for heritage cast-iron systems being restored and condensing upgrades on older Vancouver homes.
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 Weil-McLain service calls across Metro Vancouver, the recurring issues we see are: old cast-iron units suffer from sediment build-up in old hydronic loops, expansion-tank waterlog, circulator wear.
Parts availability. Weil-McLain parts are widely stocked and the cast-iron heritage units have parts available decades after install.
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.
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.
To book Weil-McLain 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 Port Coquitlam, Westwood Plateau, Ladner and Pitt Meadows.
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.
“Canro does an amazing job! Super professional and skilled with everything—boilers, furnaces, and AC. Always a pleasure working with them!”
“Five stars for Canro. We needed a replacement of a 30-year-old boiler. A new high-efficiency unit was installed—clean, professional work.”
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25+ years keeping Metro Vancouver homes comfortable. Honest advice, upfront pricing, work that lasts.