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This is a New Lennox VSP3-1 control board.Lennox Cat # 24M00. Part # LB-100646. This is New old truck stock. May have been installed momentarily for diagnostic help.Replaces: VSP2, VSP2-1, VSP3-1. LB-66434, LB-66434A, LB-94691A, LB-100646, 38L95, 24M00, 56J6501. All these parts are obsolete, and no longer available from Lennox.
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