Answer Hello John, If there is a frost buildup the issue has been caused by a defrost failure, C0472.4.8, CF2003-56, C0507.4.3. If there is no frost buildup, you most likely have an air circulation issue caused by a bad evaporator fan motor C0507.4.2-3. Read More... Answered by AppliancePartsPros.com | Wednesday, June 15, 2016