Supplier firm Norcold voluntarily recalled four RV gas/electric refrigerator models due to a potential safety defect.

The unit of Thetford Corp. recalled cooling units with model numbers N841, N821, N641 and N621. The serial numbers on the affected cooling units range from 1038000 to 1099000 and on the refrigerators from 691972 to 771576.

The recalled refrigerators were manufactured between May and November of 1999.

Owners of the recalled units should call 800 767-9101 for more information.