Rheem Protech defrost control kit with external 50 degree F defrost sensor. Board measures 3.5″ x 2-7/8″. Includes defrost sensor # 47-21777-10 or 472177710.
Replaces part numbers 47-21517-03, 47-21517-08, 47-21517-09, 47-21517-10, 47-21776-06, 472151703, 472151708, 472151709, 472151710, 472177606, 621-550 & 621-83-550
