Garage door diagnosis

Public diagnosis knowledge for garage door issues

Approved symptom records from Garage Door Fix service pages and the website troubleshooter. Raw customer conversations stay private; this page publishes clean diagnosis patterns, safety warnings, and booking handoff signals.

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service intentsprings

Broken garage door spring

If your garage door suddenly feels extremely heavy, will only lift a few inches, or you heard a loud bang from the garage, the most likely cause is a broken torsion spring. Stop using the opener. The opener is not designed to lift the full door weight by itself, and forcing it can damage the motor, rail, or top panel. Garage Door Fix replaces springs in matched pairs because both springs have gone through the same number of cycles.

Common symptoms

  • Loud bang from the garage
  • Door feels very heavy by hand
  • Visible gap in the torsion spring
  • Opener runs but door barely moves

Likely causes

  • Broken torsion spring
  • Worn spring system
  • Door weight no longer counterbalanced

Safe checks

  • Leave the door closed if possible
  • Unplug or avoid using the opener
  • Check for a visible spring gap from a safe distance

Stop and call

  • Do not loosen spring hardware
  • Do not try to wind torsion springs
  • Do not keep running the opener against a heavy door

Sources: /garage-door-repair-cost-calgary/, TROUBLESHOOTER_WORKFLOW

service intentweatherstripping

Garage door frozen to the concrete

If the garage door is frozen to the concrete, stop trying to lift it with the opener. The opener can tear the bottom seal, bend the top section, or damage the trolley. From inside the garage, check whether the rubber seal is stuck to ice. Warm water can release the seal, but clear the water immediately so it does not refreeze. If the seal is ripped, flattened, or daylight is visible under the door, weatherstripping replacement may be needed.

Common symptoms

  • Door stuck at the floor
  • Opener strains then stops
  • Bottom rubber seal frozen
  • Door opens after ice is removed

Likely causes

  • Frozen bottom weather seal
  • Meltwater refreeze
  • Worn bottom seal
  • Uneven concrete

Safe checks

  • Stop using the opener
  • Melt ice gently from inside if safe
  • Clear water before it refreezes
  • Keep the threshold clean

Stop and call

  • Do not pry aggressively under the door
  • Call if the seal is torn or the door is off balance

Sources: /blog-edmonton/why-edmonton-garage-doors-freeze-shut/, /services-calgary/garage-door-bottom-seal-replacement-in-calgary/

service intentcables

Garage door is crooked or stuck at an angle

If the garage door is crooked, jammed at an angle, or one side is higher than the other, stop using it. The most common cause is a cable that came off the drum or snapped. Running the opener can bend tracks, damage panels, or make the door fall. This is a professional repair because the cable system works with spring tension. Garage Door Fix normally replaces cables as a pair and checks the brackets, drums, rollers, and spring balance at the same visit.

Common symptoms

  • Door hangs crooked
  • Loose cable on the floor
  • One side lifted higher than the other
  • Door stuck in the tracks

Likely causes

  • Cable off drum
  • Broken lift cable
  • Worn bottom bracket
  • Door hit an obstruction

Safe checks

  • Stop operating the opener
  • Keep people and vehicles away from the door
  • Take photos from a safe distance for the technician

Stop and call

  • Do not loosen bottom brackets
  • Do not try to rewind cables
  • Do not force the door open

Sources: /services-calgary/garage-door-cable-replacement-calgary/, TROUBLESHOOTER_WORKFLOW crooked-door branch

service intentopeners

Garage door opener hums but the door does not move

If the opener hums, clicks, or lights up but the garage door does not move, do not keep pressing the remote. First check whether the door is locked and whether the emergency release is disconnected. Then, with the opener disconnected, carefully test whether the door feels unusually heavy. If it does, the spring system is likely the real problem. If the door moves normally by hand, the opener may have a stripped gear, trolley issue, bad capacitor, or internal failure.

Common symptoms

  • Opener hums
  • Motor runs but chain or belt does not move
  • Door does not move by remote
  • Opener clicks only

Likely causes

  • Broken spring
  • Disconnected trolley
  • Stripped opener gear
  • Failed capacitor
  • Door lock engaged

Safe checks

  • Check wall lock button
  • Check whether the trolley is connected
  • Do a careful manual balance test only if the door is fully closed

Stop and call

  • Stop if the door feels heavy
  • Do not keep running the opener
  • Do not open opener housing unless qualified

Sources: /services-calgary/garage-door-opener-repair-calgary/, GDF service-intent seed 2026-06-29

service intentsensors

Garage door reverses before touching the floor

When a garage door starts to close and reverses before touching the floor, the first thing to check is the photo-eye safety sensors near the bottom of the tracks. Both sensors should face each other and show steady indicator lights. Wipe the lenses, remove anything blocking the beam, and gently realign the sensor until the receiving light is solid. If the door still reverses, the issue may be wiring, sun interference, bad sensors, track alignment, or opener force settings.

Common symptoms

  • Door starts down then reverses
  • Opener lights flash
  • Sensor light blinking
  • Door will not close unless wall button is held

Likely causes

  • Misaligned photo eyes
  • Dirty sensor lens
  • Sun interference
  • Loose sensor wire
  • Failed safety sensor

Safe checks

  • Wipe both sensor lenses
  • Move objects away from the sensor beam
  • Check that both sensor lights are on
  • Gently align sensors until the receiving light is steady

Stop and call

  • Do not bypass safety sensors
  • Call if wires are damaged or the issue returns

Sources: TROUBLESHOOTER_WORKFLOW nodes 18-43, /garage-door-sensor-sun-interference-calgary/