Chamberlain LiftMaster Professional SW420 Installation And Maintenance Instructions Manual page 34

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FOR TECHNICAL SUPPORT

Call our toll free numbers:

(800) 323-2276

(800) 998-9197

Installation and service information is

available six days a week.

TO ORDER REPAIR PARTS

Call our toll free numbers:

(800) 528-2806

(800) 998-9197

Prepare to provide the following

information when ordering repair parts:

Part Number

Part Name

Model Number

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Troubleshooting