When the temperature drops below −15°C, garage doors start misbehaving in ways they never do in summer. Stuck doors, openers that hum but don't lift, frozen bottom seals — every January we field a wave of calls from frustrated GTA homeowners. Most of these problems are predictable, and most are preventable. Here's what's actually happening, and what to do.
The bottom seal is frozen to the concrete
By far the most common winter call. Snowmelt runs off the door overnight, refreezes against the bottom seal, and bonds the rubber to the concrete pad. When the opener tries to lift, it pulls against an immovable seal and either stalls (if the safety reverse kicks in) or — worse — tears the seal off the bottom of the door.
What to do: don't keep hitting the button. Pour a kettle of warm (not boiling) water along the seam between the seal and the concrete, wait a minute, then try again. Boiling water can crack cold concrete, so warm only.
Prevention: apply a thin coat of silicone-based lubricant to the bottom seal in November. It stops the rubber bonding to ice. Don't use WD-40 or oil-based lubricants — they degrade rubber.
Grease in the rails has stiffened
Old-style lithium grease turns into a gummy paste below −10°C. Combined with already-tired rollers and a spring that's lost some tension to cold-cycle fatigue, the opener simply doesn't have the torque to overcome the friction. The motor runs, the door barely moves.
What to do: in the short term, pull the emergency release and try operating the door by hand. If it moves freely by hand but the opener can't lift it, the spring has likely failed (cold makes weak springs fail). If it's stiff by hand too, the rails need re-lubrication.
Prevention: have the rails serviced with a winter-rated synthetic lubricant every 2–3 years. Standard maintenance, takes about 30 minutes.
The torsion spring snapped overnight
Cold steel is brittler than warm steel. Springs that were on borrowed time at the end of fall often snap during the first true cold snap of the season. You'll usually hear it — a loud bang from the garage in the middle of the night. In the morning, the door won't open.
What to do: don't try to force it. The opener can't lift the door without a working spring, and trying repeatedly will burn out the opener motor. Disconnect the opener (red emergency release), leave the door closed, and call. Same-day spring replacement is almost always available across the GTA.
Prevention: if your springs are 7+ years old, replace them in fall before the cold sets in. Standard 10,000-cycle springs in our climate go around year 7; high-cycle 20,000-rated upgrades push that toward 14.
The opener's logic board has reset
Some older Wi-Fi smart openers lose their pairing or factory-reset themselves after a hard cold snap (we've seen this most on early-2010s LiftMaster MyQ units). The opener is functional but won't respond to remotes.
What to do: try the wall button first. If that works, re-pair the remotes (hold the LEARN button on the opener, press the remote within 30 seconds). If even the wall button doesn't work, check the GFCI outlet — power may have tripped overnight.
A roller cracked from cold-snap brittleness
Cheap steel rollers with unsealed bearings can crack outright at −20°C, especially under load. The wheel falls out of the track, the door derails, and now you have an off-track problem on top of the cold problem.
What to do: don't operate the door. Call for off-track repair. Trying to muscle it back will bend a panel.
Prevention: switch to sealed nylon rollers. They're rated to colder temperatures, run quieter, and outlast steel by 2–3x in our climate. Roller swap on a typical door is $80–$120.
When to call instead of fighting it
Three rules of thumb. One: if the door isn't moving and you've tried it 3 times, stop. Continued attempts on a frozen, broken-spring, or off-track door turn small problems into expensive ones. Two: never stand under a partially open garage door — if anything fails it can crash down. Three: same-day service is almost always available in winter, even on weekends. We carry the parts, we expect the call volume, and we'd rather come out today than rebuild a torn-off seal next week.
A quick fall service appointment — lubrication, spring inspection, roller check, opener calibration — usually runs $120–$180 and prevents the most common winter failures. Worth the call before the first −15°C night.