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Operator does not operate from either wall control or transmitter

If operator does not operate from either wall control or transmitter,what should we do?

1、Does operator have electric power? Plug a lamp into the electric outlet to see if lamp turns on. If not, check fuse box or circuit breaker ( some outlets are controlled by wall switch).
2、Have you disengaged all locks on door? If not, do so.
3、The garage door spring may be broken. Have it replaced by a professional garage door technician.
4、Has snow or ice built up under door? Door may be frozen to ground. Remove any restrictions.