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HVAC error code 33 is a technical term used to communicate an abnormal air conditioning and heating situation.
The error code can have different meanings. It is also used to identify various problems in the system, such as low oil or several other issues. This can cause the furnace or heater to overheat, leading to burning and carbon monoxide leaks.
The following symptoms are typical for the HVAC error code 33:
- The fan does not turn on.
- There is no cool air coming out from the registers.
- The fan turns on, but no cold air comes out from the registers.
- The thermostat dial shows that it's cooling, but it is not cooling at all.
An hvac error code 33 is when your furnace kicks on but does not produce any heat and will likely result in a bigger issue.
Many people think the best way to determine the problem would be to check the hvac error code 33 with a service tech.
This is a very easy mistake to make because codes vary from manufacturer to manufacturer and rely on the model of the furnace you are checking.
hvac error code 33 is a temperature-sensing error code that indicates that one or more of your indoor air handlers (cooling, heating, or ventilation) has detected an error.
Many people are unaware of what hvac error codes mean and how to fix them. If you're unsure what the issue may be, it can be helpful to look at your current hvac system's manual and diagnose the problem there. When you have determined the issue, you can follow the steps in your manual for troubleshooting and repair.
Many people find hvac error code 33 confusing since it doesn't correspond with any specific issue or problem.
Among the most common causes for this hvac error code is damage to cooling coils due to a lack of refrigerant.
"Inspections, Installations, Repairs & Maintenance"
Selecting and servicing HVAC systems in Metro Vancouver involves several local factors — climate, available rebates, code requirements — covered below. 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.
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 HVAC system systems across Metro Vancouver since 1999, including installations and service calls in Port Moody, Maillardville, White Rock and Maple Ridge.
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.
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 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 Moody, Maillardville, White Rock and Maple 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.
“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.”
“I can’t speak highly enough about George, who was recommended for a boiler service call for my parents’ home. George is excellent.”
25+ years keeping Metro Vancouver homes comfortable. Honest advice, upfront pricing, work that lasts.