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

When the blower on your Daikin furnace runs and runs and will not shut off, the first thing to sort out is whether it is a genuine fault or simply the fan doing what it was told. A continuously running blower is one of the more common furnace calls we get in Greater Vancouver, and a good share of them turn out to be a thermostat setting rather than a broken part. The rest usually trace to a small number of real causes worth diagnosing, because a blower that never rests wears its motor and runs up your electricity.

Daikin residential gas furnaces are built on the Goodman and Amana platform, so the blower control, the limit switch and the control-board logic are shared across those brands. That means a Daikin “fan won’t turn off” problem is diagnosed the same way we would approach a Goodman or Amana — and the very first check is the simplest.

ROMA Heating & Cooling has diagnosed constant-blower faults on Daikin, Goodman and Amana furnaces across Vancouver, Burnaby, Richmond, Surrey and the North Shore since 1999. Here are the likely causes, the safe checks, and when to call a technician.

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

Thermostat fan set to ON

If the fan is set to ON rather than AUTO, the blower runs continuously by design — this is normal, not a fault. Safe check: set the thermostat fan to AUTO and see whether the blower stops after the current cycle and its fan-off delay.

Normal fan-off delay

After the burners shut off, the blower keeps running for a set time to move the remaining heat out of the exchanger — often one to a few minutes. Safe check: wait a few minutes after a heat cycle before concluding it will not stop.

Limit switch stuck closed

If the furnace overheats — usually from a dirty filter or restricted airflow — the high-limit keeps the blower running to cool the exchanger, and a stuck or repeatedly tripping limit can hold the fan on. Safe check: replace a dirty 1-inch filter and open registers.

Control-board relay stuck on

The blower relay on the control board can stick closed, holding the fan on regardless of the thermostat. Safe check: none internal — a technician confirms and replaces the board.

Thermostat or wiring fault

A miswired or faulty thermostat, or a stuck G (fan) signal, can command the fan on continuously. Safe check: confirm the fan setting is AUTO; if it still runs, the thermostat or wiring needs checking.

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: set the fan to AUTO and wait through one full heat cycle plus a few minutes for the normal fan-off delay. If the blower stops, it was simply the fan setting or the delay — nothing is wrong. If it keeps running on AUTO, replace a dirty 1-inch filter and open any closed registers, because an overheating furnace will deliberately hold the blower on to protect the heat exchanger, and restoring airflow can let a stuck-open limit reset. If the blower still will not stop after those checks, stop there — a stuck limit switch or a stuck blower relay on the control board are internal components a licensed technician diagnoses. Do not bypass the limit switch; it is a safety.

How ROMA pinpoints a Daikin constant-fan fault

We start by ruling in or out the two normal explanations — the fan setting and the fan-off delay — then measure. We check whether the furnace is overheating, because a high-limit holding the blower on to cool a hot exchanger is a protective response, not a fault in itself; we find and fix the airflow restriction behind it. If the furnace is not overheating and the thermostat is on AUTO, we test the blower relay on the control board and the limit switch, since a stuck relay or a limit that will not open will hold the fan on. We also check the thermostat and its wiring for a stuck fan signal. On the Goodman/Amana platform these are well-understood parts, and we confirm the fix by watching the blower cycle off normally before we leave. When you call (604) 704-0300, tell us whether the furnace feels hot and whether the fan is set to ON or AUTO.

When it is an emergency

A blower that will not turn off is generally not an emergency — if anything, a fan running is safer than a fan that will not run. But if the furnace is clearly overheating, or you smell burning, shut it off at the switch and call. And as always, if you smell gas or a CO alarm sounds, leave the home and call 911 and FortisBC from outside.

Repair or replace?

Clearing an airflow restriction is essentially free, a limit switch is an inexpensive repair, and a control board is a moderate one — all worth doing on a sound Daikin. Replacement of the furnace only enters the conversation on an older unit with other stacking issues, where we compare the repair against a high-efficiency upgrade with any available rebates. We quote the repair first, after diagnosis.

Greater Vancouver context

In our climate, constant-blower calls often trace back to airflow: a filter left too long in a busy Surrey or Coquitlam household, or closed registers in unused rooms of an older Vancouver home, let the furnace overheat and hold the blower on. Many homeowners here also run the fan on ON year-round for air circulation, which is a legitimate choice — it just means the blower will not stop, by design. Sorting the setting from the fault is usually the whole job.

ON versus AUTO, and the fan-off delay

Two normal behaviours cause most of these calls, and understanding them saves a service visit. First, the fan mode: on ON the blower runs continuously on purpose, while on AUTO it runs only during a heat cycle and its delay. If your blower never stops, check that switch before anything else. Second, the fan-off delay: after the burners shut down, the control deliberately keeps the blower running for a minute or more to sweep the last of the heat out of the exchanger — this improves efficiency and protects the furnace, and it is completely normal. Only a blower that runs continuously on AUTO, well past the delay, and without the furnace overheating, points to a genuine fault such as a stuck relay. Knowing the difference tells you whether you are looking at a setting or a repair.

What to note before you call

A few observations tell us quickly whether you have a setting or a fault. Note whether the thermostat fan is set to ON or AUTO, whether the blower stops if you switch it to AUTO and wait out the fan-off delay, and whether the furnace cabinet feels unusually hot, which would suggest an overheat holding the blower on to protect the exchanger. Mention whether the filter is overdue or registers are closed, since restricted airflow is the usual trigger for a limit-driven constant fan. If the blower runs continuously even on AUTO, past the delay, with the furnace not overheating, that points to a stuck blower relay or limit switch — and knowing that ahead of time means we arrive ready to test the board and the limit rather than just confirming a setting.

Why ROMA for Daikin 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 separate a normal fan setting from a stuck limit or board relay and get your Daikin blower cycling correctly 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. See our furnace repair service or book a free estimate. We serve Vancouver, Burnaby, Richmond, Surrey, Coquitlam and the North Shore — call (604) 704-0300, reach our team, or ask about maintenance plans that keep airflow and controls healthy.

Frequently Asked Questions

Why won't my Daikin furnace blower turn off?

Common causes are the thermostat fan set to ON, the normal fan-off delay after a heat cycle, a limit switch held closed by overheating, or a stuck blower relay on the control board. Set the fan to AUTO and clean the filter first, then call ROMA at (604) 704-0300 if it still runs constantly.

Is it normal for my Daikin blower to run after the heat stops?

Yes. The control keeps the blower running for a set fan-off delay — often one to a few minutes — to move remaining heat out of the exchanger. This is normal and efficient. Only a blower that runs continuously on AUTO, well past the delay, points to a fault.

Can a dirty filter make my Daikin fan run constantly?

Yes. A restricted filter can overheat the furnace, and the high-limit will hold the blower on to cool the heat exchanger — a protective response. Replacing the filter and opening registers restores airflow and often lets a stuck-open limit reset. Never bypass the limit switch; it is a safety.

Will running my Daikin fan on ON hurt the furnace?

Running the fan on ON for constant air circulation is a legitimate choice and will not harm the furnace, but the blower will run continuously by design. If you want the fan to stop between heat cycles, set the thermostat fan to AUTO. That alone resolves many constant-blower concerns.

Does ROMA fix Daikin blower control faults in Greater Vancouver?

Yes. ROMA Heating & Cooling separates a normal fan setting from a stuck limit or control-board relay and repairs the fault across Vancouver, Burnaby, Richmond, Surrey and the North Shore. We are TSBC-licensed, bonded and insured. Call (604) 704-0300 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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