Goodman Furnace Blower Fan Won’t Turn Off in Greater Vancouver — Causes & Repair

When your Goodman furnace blower keeps running and will not shut off, it is easy to assume the worst, but this is usually a controls problem rather than a dangerous one. In most Greater Vancouver homes, a constantly running blower traces back to a simple thermostat setting or a safety device doing its job. The furnace fan running non-stop is annoying and drives up your hydro bill, but it is the furnace protecting itself in some cases.

There is an important distinction: a blower that runs but blows warm air on a heat call is behaving normally at the end of a cycle (it purges leftover heat). A blower that never stops, cycle after cycle, hour after hour, is the problem we are solving here. ROMA Heating & Cooling has diagnosed constant-blower calls on Goodman furnaces across Vancouver, Burnaby, Richmond and the North Shore since 1999.

Here are the common causes on a Goodman furnace, the checks you can safely make yourself, and where to stop and call a licensed gas technician.

Most likely causes of a Goodman blower that won’t turn off

Thermostat fan set to ON instead of AUTO

This is the single most common cause and the easiest to fix. If your thermostat’s fan setting is ON, the blower runs continuously by design, regardless of heat calls. Safe check: set the fan to AUTO. If the blower stops shortly after, that was it — no service call needed. Some homeowners deliberately run ON for air circulation and filtration, which is fine and not a fault.

Stuck or tripped high-limit switch

The high-limit switch keeps the furnace from overheating. If it senses excess heat — usually from restricted airflow — it keeps the blower running to cool the heat exchanger even after the burners shut off. A limit that is stuck closed or repeatedly tripping will hold the blower on. Safe check: replace a dirty 1" filter and open any blocked supply and return registers; restricted airflow is the usual trigger in our experience. The limit switch itself is a technician repair.

Failed fan relay or control-board fault

The blower is switched by a relay on the Goodman integrated control board. If that relay welds closed or the board fails, it can feed the blower power continuously. Safe check: none internal — a licensed tech tests the relay and board.

Faulty fan-limit control or wiring

Older Goodman setups may use a combination fan-limit control; a miscalibrated or failed control, or a wiring fault, can hold the blower on. This is a diagnostic-and-repair task for a tech.

Thermostat wiring (G terminal) issue

A short or miswire on the fan (G) circuit — sometimes after a thermostat swap — can energize the blower constantly. A technician traces the low-voltage wiring.

Blower-won’t-stop quick-reference

📞 Talk to a licensed ROMA furnace technician — (604) 704-0300

Safe things to try once

Start with the thermostat: set the fan to AUTO and lower the temperature below room temperature to end the heat call. Wait a few minutes — a normal post-heat purge can last a bit before the blower stops. Replace a dirty filter and open blocked registers to rule out an airflow-driven limit. Then cycle furnace power once at the switch. If the blower stops and stays off on AUTO, you have solved it. If it runs continuously even on AUTO with the thermostat satisfied, stop — that points to a relay, board or limit issue that needs a licensed technician. Do not remove or bypass the limit switch to stop the blower; that switch is a safety device.

How ROMA pinpoints a Goodman blower that won’t quit

The fastest way to solve a constant blower is to separate a controls problem from a safety-driven one, and that is where our technician begins. We confirm the thermostat’s fan configuration and the fan-off delay setting on the Goodman board, then watch the blower relay in operation: does it de-energize when the heat call ends, or is it stuck feeding the motor power? A relay that has welded closed will hold the blower on regardless of what the thermostat says, and that is a straightforward, affordable part to replace once confirmed.

If the relay is dropping out correctly but the blower still runs, we look at the high-limit circuit, because a limit that is holding the fan on to cool an overheating heat exchanger is telling you about an airflow problem, not just a switch. We measure static pressure and temperature rise to find whether a restrictive filter, an undersized or partly closed return, or a tired blower wheel is the real driver — common in Metro Vancouver townhomes and condos where returns get blocked by furniture or storage in tight mechanical closets. Fixing the airflow often resolves the blower behaviour for good, rather than just replacing a limit that will trip again.

When you call (604) 704-0300, have this ready to speed things up:

• The furnace model and serial number.
• Whether the blower runs in every mode or only after a heat cycle.
• Your thermostat fan setting — ON or AUTO — and whether switching it changes anything.
• Whether anything recently changed, such as a new thermostat installed by another trade.

Constant-blower calls are rarely urgent, but they waste electricity every hour they run, so it is worth sorting quickly — and we will tell you honestly whether it is a settings tweak or a genuine repair.

When it’s an emergency

A constantly running blower is rarely an emergency on its own, but the safety rules still apply. If you smell gas, leave the home, call FortisBC’s emergency line and 911 from outside, and do not touch switches. If a CO alarm sounds or anyone feels unwell, get everyone out and call 911. Also, if the blower runs constantly and the air smells hot or electrical, or you see or smell burning, shut the furnace off at the switch and call us — a constantly energized motor can overheat.

Repair vs. replace

A stuck relay, failed limit or thermostat fix is almost always a worthwhile repair — these are common, well-understood parts. If your Goodman is well past its expected service life and the control board is failing along with other worn components, it may be worth comparing repair cost against a high-efficiency upgrade, especially given the rebates available in BC. Our team will give you an honest read rather than pushing a replacement.

Keeping the blower from running non-stop

A few simple habits prevent most constant-blower problems on a Goodman. First, know your thermostat: leaving the fan on AUTO lets it run only during heat cycles, while ON runs it continuously by design — a legitimate choice for circulation, but worth understanding so a setting is not mistaken for a fault. Second, stay on top of airflow, because the limit-driven version of this problem starts with restricted airflow overheating the heat exchanger. Change the 1" filter on schedule, keep supply and return registers open, and do not store boxes or furniture against the return in a tight Metro Vancouver mechanical closet.

The relay side of this problem is harder to prevent because relays simply wear out with cycles, but an annual tune-up catches a relay that is starting to stick and a limit that is tripping more often than it should, before either strands your blower in the on position. If a different trade has recently replaced your thermostat, it is also worth having the fan wiring confirmed, since a miswired fan terminal is a common cause of a suddenly constant blower. Our technicians check all of this as part of routine service so the blower shuts off when it should.

Why ROMA for Goodman furnaces in Vancouver

ROMA Heating & Cooling is a TSBC-licensed gas contractor (Gas licence LGA0202903), bonded, insured and Red Seal-trained, with a 4.8-star rating from 221 Google reviews. We test the fan relay, limit circuit, control board and thermostat wiring to find why your blower won’t quit, and we quote upfront flat-rate pricing with no hidden fees. Estimates on installs are free, 0% financing is available OAC, and we work seven days a week. Explore our furnace repair service or book a free estimate.

We serve Vancouver, Burnaby, Richmond, Surrey, Coquitlam, New Westminster, the North Shore and the Fraser Valley. Constant-blower calls are common in strata townhomes and condos where thermostats get swapped by different trades over the years. Call (604) 704-0300 and we will sort it out. Ask about our maintenance plans to keep airflow and limits healthy, or check current rebates if you are considering an upgrade.

Frequently Asked Questions

Why does my Goodman furnace blower run constantly?

The most common reason is the thermostat fan set to ON instead of AUTO, which runs the blower continuously by design. If it is on AUTO and still won’t stop, likely causes are a high-limit switch holding the blower on due to restricted airflow, or a stuck fan relay on the control board. Check the thermostat first, then call ROMA at (604) 704-0300.

Is it bad to leave my furnace fan running all the time?

Running the fan on ON for circulation and filtration is a valid choice and not harmful, though it uses more electricity. The problem is when the blower won’t stop even on AUTO with the thermostat satisfied — that indicates a relay, board or limit fault that should be diagnosed rather than left running.

Can a dirty filter make my Goodman blower run non-stop?

Indirectly, yes. A clogged filter restricts airflow, which can overheat the heat exchanger and cause the high-limit switch to keep the blower running to cool it down. Replacing a dirty 1-inch filter and clearing blocked registers often resolves airflow-driven blower issues.

Should I remove the limit switch to stop the blower?

No. The high-limit switch is a safety device that prevents the furnace from overheating. Never bypass or remove it to stop the blower. If the limit is holding the fan on, the fix is to restore proper airflow or replace the switch — work for a licensed technician.

Does ROMA repair Goodman blower and fan problems in Greater Vancouver?

Yes. ROMA Heating & Cooling diagnoses and repairs constant-blower and fan issues on Goodman furnaces throughout Vancouver, Burnaby, Richmond, Surrey and the North Shore. We are TSBC-licensed, bonded and insured. Call (604) 704-0300 for prompt service seven days a week.

Reviewed by the ROMA Heating & Cooling team — TSBC-licensed gas contractor (Gas LGA0202903), serving Greater Vancouver since 1999. Updated July 2026.

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