The door touches something on the way down and doesn't reverse, or reverses late
Why it happens
On many home openers, the safety reverse only acts once the door touches something. If the force setting is off, the door can press harder before it turns around.
Why it matters
The safety reverse is there to stop a closing door hurting someone caught under it. A door that opens and shuts fine every day tells you nothing about how it acts in that moment.
Response
Thom tests the opener and its safety reverse on every service. If the reverse fails, he adjusts or repairs the opener before anyone relies on it again.




