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Common Lochinvar fault codes with what each means, the likely cause, and what CANRO Heating & Cooling does to fix them. Servicing Lochinvar systems across Metro Vancouver since 1999.
Lochinvar Knight Combi, Knight Boiler, Crest, and Armor units use the Lochinvar SMART System control. Error codes appear with both numeric and text descriptions on the SMART Touch display.
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 Lochinvar parts in every truck — most code-triggered faults are resolved in a single visit.
What it means: Boiler tripped a safety circuit requiring manual reset.
Common causes: Various — display shows the underlying code.
What to do: One reset; persistent service.
Reset guidance: one reset OK
What it means: Flame rod, ignitor, gas.
Common causes: Standard service.
What to do: one reset OK
Reset guidance: no
What it means: Dirty rod, condensate, low gas.
Common causes: Clean and service.
What to do: one reset OK
Reset guidance: no
What it means: Low flow, scaling, valve closed.
Common causes: Service.
What to do: no
Reset guidance: POSSIBLY
What it means: Leak, low fill, failed sensor.
Common causes: Top up; locate leak.
What to do: top up
Reset guidance: no
What it means: Vent, APS, fan.
Common causes: Inspect vent; call.
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: Cable, BMS network.
Common causes: Wiring check.
What to do: no
Reset guidance: no
What it means: SMART Touch board fault.
Common causes: Board replacement.
What to do: no
Reset guidance: no
What it means: Conditions like anti-cycle, pump prove, vent purge.
Common causes: Usually self-clear.
What to do: varies
Reset guidance: no
Note the exact code on your display, then call CANRO. Most Lochinvar faults are diagnosed and repaired on the first visit because we stock common Lochinvar service parts in every truck.
📞 Call (604) 359-1081 nowCANRO services Lochinvar commercial-grade boilers and water heaters in every Metro Vancouver city — including same-day emergency response for no-heat, no-hot-water, and gas-leak situations. See our city-specific Lochinvar pages:
→ See the full Lochinvar lineup hub page with every model, specs, and install costs
This Lochinvar error code guide is maintained by the CANRO Heating & Cooling team based on 25+ years of Lochinvar install, service, and repair experience across Metro Vancouver. Codes and behaviour described match current model manuals. Last reviewed May 2026.
Below is a CANRO technician's perspective on HVAC systems as they apply in Metro Vancouver: what to look for, what to avoid, and what to expect. CANRO Heating & Cooling provides complete HVAC services across Metro Vancouver — heating, cooling, ventilation and hot water — for residential homes, condos with strata systems, townhouses and small commercial buildings.
Vancouver's moderately hard tap water (around 60-100 ppm hardness in most of Metro Vancouver) affects tankless water heaters, combi boilers, and hot-water tanks — annual descaling is essential. CANRO has worked with HVAC system systems across Metro Vancouver since 1999, including installations and service calls in Whalley, Newton, Broadmoor and Como Lake.
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.
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.
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.
To book 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 Whalley, Newton, Broadmoor and Como Lake.
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.