garage door opener frequency change -- I need to disable the old receiver
I have a Craftsman 1/2 HP GDO from 08/91, model 139.53615SR. It occasionally opens and closes with no signal from me. I understand that the old 890MHz frequency is subject to military interference and that this is a known problem. Sears suggested that I buy the conversion kit to change to 815 MHz which I did: PN 953751. I installed it and it works fine: it's just that my old remote still controls the 890 MHz unit in the GDO and the new remote controls the new 815 MHz receiver. This is no good to me because if my local base is sending interfering signals on 890 it will continue to open the door. How do I disable the 890 MHz receiver so that all I have is the 815 unit? There are no instructions with the conversion kit.
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