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Liftmaster Professional CB24 / LYN400 24v - RPM Reversal Error
18-08-2012, 02:31 PM
Post: #1
Liftmaster Professional CB24 / LYN400 24v - RPM Reversal Error
Hi been running the above system for 6 years now with virtually no problems. All of a sudden I have got the RPM reversal error. Gates open about 20 degrees then stop. Think it is a problem with arm (gate) 2 as it errors if I try to set open limits. If I disengage motors both gates open and close smoothly by hand. Can anybody help !!
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20-08-2012, 09:40 AM
Post: #2
RE: Liftmaster Professional CB24 / LYN400 24v - RPM Reversal Error
All you can do is check and make sure the cable or any cable connections are not corroded or shorting out. Other than that you will need a New Arm as the rpm sensor is embedded inside the motor windings and the motor is very difficult to change. Easier and cheaper soloution is a replacement Arm.

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