The load path, end to end. Spring condition read through balance behaviour — where the door floats, where it drifts, how much hand force the release test takes. Cable condition at the brackets and drums, where fray starts. Roller bearings and hinge knuckles, where travel noise is born. Opener closing force against spec, travel limits against the floor, the photo-eye circuit proven with the beam interrupted, reversal proven against a block.
None of that is lubrication theatre. Greasing hinges without reading spring drift misses the one number that schedules the next failure; wiping tracks with the wrong product collects grit that seizes rollers. The visit ends with a dated condition report — what is worn, what is fine, what fails next and roughly when — which is the difference between a booked appointment and a snapped spring on the coldest morning of the year.
The interval question answers itself from usage: about 1,460 cycles a year at the household average of four a day, double that for a garage that serves as the front door. Annual service fits the first pattern, semi-annual the second — and both beat the alternative schedule, which is whenever the coldest week of winter decides for you.
// TERMS THAT DECODE THE QUOTE
Balance test
Door down, release pulled, one-hand lift to half height: a balanced door floats. The single most predictive owner check in the system.
Reversal test
A board flat under the closing door must trigger immediate reverse on contact — the quarterly proof the entrapment protection works.
Force setting
The opener’s closing-force ceiling — calibrated to the minimum that completes travel, because excess force is how doors damage what they meet.
Caution band
Inspection findings that are not failures yet: measured wear with a monitoring interval attached instead of a repair bill.