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Brian
Brian, Architect
Category: Home Improvement
Satisfied Customers: 2153
Experience:  Licensed Architect- 17 years, L.E.E.D. AP
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Have LiftMaster Professional Formula 1 that fails operate when

Customer Question

Have LiftMaster Professional Formula 1 that fails operate when wall switch pressed momentarily. However the units light blinks for approx. 10 secs. Yet if the wall switch
depressed for the full closure cycle the door stays closed. What to do?
Submitted: 8 months ago.
Category: Home Improvement
Expert:  Neil replied 8 months ago.
What about on opening? Is it only on close that it won't function?

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