Door Selector Fault or Closer Fault? A Pair Test That Saves Guesswork

Door Selector Fault or Closer Fault? A Pair Test That Saves Guesswork Related diagnostic: Double Fire Doors: How to Find the Leaf That Should Arrive First explores the connected fault pattern and helps compare the evidence before choosing a repair. A pair closing in the wrong order can be caused by the selector, an individual closer or another resistance affecting one leaf. What the pattern is telling you Test each leaf separately, then the pair, and only after that inspect the selector or coordinator. This separates individual leaf imbalance from a genuine sequencing fault. For closer faults I would record exactly when and where resistance or interference appears. Check the arm, shoe, body mounting, hinges, seals, latch/keep, frame and bottom interface before changing hydraulic settings. Closer power is an input into the system; it does not automatically remove resistance elsewhere.…