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

A Coleman furnace blower that simply won’t stop — running continuously long after the burners have shut off, sometimes blowing cool air for hours — is the opposite of the more familiar "fan won’t start" complaint, and it points to a different set of causes. For a Greater Vancouver homeowner it’s puzzling and a little unnerving, but a constantly running blower is rarely dangerous on its own. In many cases it isn’t even a fault: it’s a setting. In others, it’s a relay or a safety switch stuck in the wrong position, and those are worth diagnosing promptly.

The first distinction to make is whether the fan runs all the time regardless of heat, or whether it just runs for a long stretch after each heat cycle. A blower running constantly usually points to the thermostat fan setting or a stuck relay; a blower that runs a long time after the burners quit points to the blower-off delay or a limit switch that’s slow to reset. Coleman is a Johnson Controls brand sharing its control platform with sister brands like York and Luxaire, so the fan-control logic behind this symptom is familiar ground for our technicians.

ROMA Heating & Cooling has diagnosed constant-blower complaints on Coleman furnaces across Vancouver, Burnaby, Richmond and the North Shore since 1999. Here are the likely causes, the safe checks you can run, and where a licensed technician needs to take over. Safety first: if you ever smell gas, leave the home and call FortisBC emergency and 911 from outside — don’t troubleshoot.

Most likely reasons a Coleman furnace blower won’t turn off

Thermostat fan set to ON instead of AUTO

This is the most common cause and it isn’t a fault at all. With the fan set to ON, the blower runs continuously by design — even when the burners are off — so it feels like it never stops and pushes cool air between heat cycles. Safe check: set the thermostat fan to AUTO so the blower only runs during a heat call and its normal off-delay.

Stuck or welded fan relay on the control board

The board switches the blower through a relay. If that relay’s contacts weld or stick closed, the blower keeps getting power even when the control wants it off. Safe check: none internal; a technician tests the relay and replaces the board or relay as needed.

Limit switch holding the fan on after an overheat

The fan/limit control runs the blower to cool the exchanger after an overheat, and won’t release the fan until temperature drops. A limit stuck closed — or one responding to genuine overheating from a dirty filter — can keep the blower running. Safe check: replace a dirty 1" filter and open registers so the furnace stops overheating; if it persists, call a tech.

Long or misconfigured blower-off delay

Coleman boards run the blower for a set delay after the burners shut off, to wring the last heat from the exchanger. If the delay is set long, or a dip-switch setting is off, the fan runs longer than expected — normal, but sometimes mistaken for a fault. Safe check: none internal; a technician confirms the delay setting.

Faulty thermostat or thermostat wiring

A thermostat sending a constant fan (G) signal, or a shorted fan wire, keeps the blower energized. Safe check: confirm the thermostat fan is on AUTO and its display is normal; persistent constant-fan calls for a wiring check.

Blower-won’t-stop quick-reference

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

Safe things to try once

Start at the thermostat: switch the fan from ON to AUTO. If the blower stops after the normal off-delay, that was the whole story — no repair needed. If it keeps running with the fan on AUTO, replace a dirty 1" filter and open all registers, in case the furnace is overheating and the limit is holding the fan on to cool it. Note how long the blower runs after the burners shut off; a minute or two is normal, but many minutes suggests a delay setting or a limit issue. If the blower still won’t stop with the fan on AUTO and a clean filter, stop and call a licensed technician — a welded relay or a stuck limit is an internal, line-voltage repair. Never pull the furnace door or defeat the door switch to stop the fan; shut it off at the furnace disconnect if you need it to stop while you wait.

What a ROMA tech checks first

• The thermostat fan setting and the fan (G) wiring for a constant signal.
• The fan relay on the control board — tested for welded or stuck-closed contacts.
• The fan/limit control, confirming it opens and releases the blower as it should.
• Airflow and the filter, in case genuine overheating is keeping the fan running.
• The board’s blower-off delay setting to confirm whether the run time is normal.

Repair vs. replace

A blower that won’t turn off is almost always a repair — and often no repair at all, just a thermostat setting. When a part is involved, it’s usually a fan relay, a limit switch, or occasionally a control board, all standard replacements on a Coleman furnace. Whole-furnace replacement only enters the picture if a failed board coincides with other end-of-life issues on an old, inefficient unit. In that case we compare the repair against a high-efficiency upgrade with any BC rebates and give you an honest recommendation. We won’t upsell a new furnace for a fan setting or a relay.

When it is an emergency

A constantly running blower isn’t an emergency by itself, but the usual safety rules apply. If you smell gas, leave and call FortisBC and 911 from outside. If a CO alarm sounds or anyone feels unwell, get everyone out and call 911. One thing to watch: if the blower is running constantly and the furnace is repeatedly overheating — hot smell, burners cutting out — the fan running is actually protecting the exchanger, so don’t try to stop it; fix the airflow and have the limit checked instead.

Coleman furnaces and Greater Vancouver homes

By far the most common "blower won’t turn off" call we take in Vancouver, Burnaby and Surrey is simply the thermostat fan left on ON — often after someone set it that way for air circulation or filtering and forgot. Once we confirm the setting, the "fault" disappears. Beyond that, the constant-fan calls that are real faults tend to be stuck fan relays on furnaces that have run many cycles through our long heating season, and limit-driven fan run-on from filters that went too long between changes in busy households. In our mild climate, a blower running on for a couple of minutes after each cycle is normal and even efficient — it recovers residual heat — so part of our job is often reassuring homeowners that a modest off-delay is by design, not a defect.

Why the fan setting is worth understanding

It’s worth knowing why the ON versus AUTO setting matters so much, because it’s the difference between a comfort choice and a repair call. On AUTO, the blower runs only when there’s a call for heat, plus a short off-delay to recover residual warmth — so it cycles with the furnace and stops on its own. On ON, the blower runs continuously, which some people prefer for even temperatures, steady air filtering, or better circulation in a multi-level home. Neither is wrong, but on ON the fan will blow room-temperature or cool air between heat cycles, which many homeowners mistake for a malfunction. If you like constant circulation, ON is a valid choice and the furnace is fine; if you want the fan to stop between cycles, AUTO is the setting. When a Coleman blower truly won’t stop even on AUTO, that’s when it becomes a diagnostic matter — a welded relay or a stuck limit — and our technician meters the relay and limit under real operation to find which one is holding the fan on. Call (604) 704-0300 and we’ll pin it down.

Why ROMA for Coleman furnaces in Vancouver

ROMA Heating & Cooling is a TSBC-licensed gas contractor (Gas licence LGA0202903), bonded, insured and Red Seal-trained, rated 4.8★ from 221 Google reviews. We find why your Coleman blower won’t turn off — fan setting, relay, limit, delay or wiring — and fix the real cause, with upfront flat-rate pricing and no hidden fees. Estimates on installs are free, 0% financing is available OAC, and we work seven days a week. Book a furnace repair or a free-estimate visit. We serve Vancouver, Burnaby, Richmond, Surrey, Coquitlam and the North Shore — call (604) 704-0300, and ask about maintenance plans to keep the blower controls in good shape.

Frequently Asked Questions

Why won't my Coleman furnace blower turn off?

The most common reason is the thermostat fan set to ON instead of AUTO, which runs the blower continuously by design. If it still won’t stop on AUTO, likely causes are a stuck or welded fan relay on the control board, a limit switch holding the fan on after an overheat, or a long blower-off delay. Check the fan setting, then call ROMA at (604) 704-0300.

My Coleman blower runs for a while after the heat shuts off — is that normal?

Usually yes. Coleman furnaces run the blower for a short off-delay after the burners shut off to recover residual heat from the exchanger — a minute or two is normal and efficient. Only a very long run-on, or a fan that never stops even on AUTO, suggests a delay setting, a stuck relay, or a limit issue worth checking.

Is it bad that my Coleman furnace fan runs all the time?

Not necessarily. If the thermostat fan is set to ON, constant running is by design and some homeowners prefer it for circulation and filtering — the furnace is fine, though it will blow cool air between heat cycles. If the fan runs constantly even on AUTO, that points to a stuck relay or limit and should be diagnosed.

How do I stop my Coleman blower that won't turn off?

First set the thermostat fan to AUTO and wait through the off-delay. If it still won’t stop and you need it off, switch the furnace off at its disconnect while you wait for service — but never pull the furnace door or defeat the door switch to stop it. A constantly running fan on AUTO needs a technician to check the relay and limit.

Does ROMA fix Coleman furnace blowers that won't turn off in Greater Vancouver?

Yes. ROMA Heating & Cooling diagnoses and repairs constant-blower faults on Coleman furnaces across Vancouver, Burnaby, Richmond, Surrey and the North Shore. We are TSBC-licensed, bonded and insured, with flat-rate pricing seven days a week. Call (604) 704-0300.

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

{“@context”: “https://schema.org”, “@graph”: [{“@type”: “Service”, “name”: “Coleman Furnace Blower Fan Won’t Turn Off in Greater Vancouver — Causes & Repair”, “serviceType”: “Furnace repair and fault diagnosis”, “description”: “Coleman furnace blower fan won’t turn off in Greater Vancouver? Learn the common causes, safe checks, and when to call ROMA Heating at (604) 704-0300.”, “provider”: {“@type”: “HVACBusiness”, “name”: “ROMA Heating & Cooling”, “telephone”: “+1-604-704-0300”, “address”: {“@type”: “PostalAddress”, “streetAddress”: “2800 Douglas Rd B”, “addressLocality”: “Burnaby”, “addressRegion”: “BC”, “postalCode”: “V5C 5B7”, “addressCountry”: “CA”}}, “areaServed”: [{“@type”: “City”, “name”: “Vancouver”}, {“@type”: “City”, “name”: “Burnaby”}, {“@type”: “City”, “name”: “Surrey”}, {“@type”: “City”, “name”: “Richmond”}, {“@type”: “City”, “name”: “Coquitlam”}, {“@type”: “City”, “name”: “North Vancouver”}, {“@type”: “City”, “name”: “West Vancouver”}, {“@type”: “City”, “name”: “New Westminster”}, {“@type”: “City”, “name”: “Delta”}, {“@type”: “City”, “name”: “Langley”}, {“@type”: “City”, “name”: “Maple Ridge”}, {“@type”: “City”, “name”: “Port Coquitlam”}, {“@type”: “City”, “name”: “Port Moody”}, {“@type”: “City”, “name”: “White Rock”}], “url”: “https://romaheating.ca/coleman-furnace-blower-fan-wont-turn-off-greater-vancouver/”, “about”: {“@type”: “Product”, “name”: “Coleman furnace”, “brand”: {“@type”: “Brand”, “name”: “Coleman”}}}, {“@type”: “FAQPage”, “mainEntity”: [{“@type”: “Question”, “name”: “Why won’t my Coleman furnace blower turn off?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “The most common reason is the thermostat fan set to ON instead of AUTO, which runs the blower continuously by design. If it still won’t stop on AUTO, likely causes are a stuck or welded fan relay on the control board, a limit switch holding the fan on after an overheat, or a long blower-off delay. Check the fan setting, then call ROMA at (604) 704-0300.”}}, {“@type”: “Question”, “name”: “My Coleman blower runs for a while after the heat shuts off — is that normal?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Usually yes. Coleman furnaces run the blower for a short off-delay after the burners shut off to recover residual heat from the exchanger — a minute or two is normal and efficient. Only a very long run-on, or a fan that never stops even on AUTO, suggests a delay setting, a stuck relay, or a limit issue worth checking.”}}, {“@type”: “Question”, “name”: “Is it bad that my Coleman furnace fan runs all the time?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Not necessarily. If the thermostat fan is set to ON, constant running is by design and some homeowners prefer it for circulation and filtering — the furnace is fine, though it will blow cool air between heat cycles. If the fan runs constantly even on AUTO, that points to a stuck relay or limit and should be diagnosed.”}}, {“@type”: “Question”, “name”: “How do I stop my Coleman blower that won’t turn off?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “First set the thermostat fan to AUTO and wait through the off-delay. If it still won’t stop and you need it off, switch the furnace off at its disconnect while you wait for service — but never pull the furnace door or defeat the door switch to stop it. A constantly running fan on AUTO needs a technician to check the relay and limit.”}}, {“@type”: “Question”, “name”: “Does ROMA fix Coleman furnace blowers that won’t turn off in Greater Vancouver?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Yes. ROMA Heating & Cooling diagnoses and repairs constant-blower faults on Coleman furnaces across Vancouver, Burnaby, Richmond, Surrey and the North Shore. We are TSBC-licensed, bonded and insured, with flat-rate pricing seven days a week. Call (604) 704-0300.”}}]}]}