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Calculators, troubleshooting and manuals for overhead door service

Diagnose a problem

TroubleshootingStart from the symptom and work to the fix
Opener fault codesWhat the opener's blinks and codes mean, and the fix
Opener DIP switchesCommon settings for LiftMaster, Genie and more

Springs and door balance

Spring calculatorIdentify, size, convert or design torsion springs
Door weightEstimate weight from size, material and gauge
IPPT referenceInch-pounds per turn from a spring or a door
Spring color codesWire size by color and wind direction
Wire sizesGauge to decimal and spring wire lookup

Cables, track and sections

Cable sizingCable diameter and length by door size and lift
Cable drumsDrum sizes and cable wraps by door height and lift
Track, headroom and clearancesWhich lift fits, plus track and roller reference
High-lift conversionWill it work, which drums, which springs
Section identifierFind the right replacement section
Torque specsBolt torque for brackets, anchors and bearing plates

How-to and safety

ProceduresStep-by-step jobs, residential and commercial
SafetyHazards and checks before you start
Manuals and documents4,500+ manufacturer manuals, by brand