One of our Genie openers refused to run. It would start and then reverse immediately, whether going up or down. The rheostats that adjust the power limits made no difference when we adjusted them, so we removed the cover and looked around inside. Mud dauber wasps had stopped the "Optical Interrupt Wheel" from turning. If it does not turn, the motor immediately reverses. It is part of the safety built into a door opener. The mud dauber nests were removed, the wheel was re-installed, and now the opener runs again. That was an easy fix!
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