Service Bulletin Description:
On some models, ice may be noticeably forming on the freezer compartment walls and/or a ticking-rumbling noise may be heard from the freezer. The ice formation will appear larger closer to the evaporator cover. Inspection may lead to diagnosis of an open drain pan heater allowing the drain pan to overflow and fill with ice. Additionally, ice may have formed around or on the evaporator fan blade: a result of moisture dripping off the evaporator wiring harnesses, suction tube, or evaporator compartment ceiling.
This Service Bulletin PDF download contains information for the following:
CSB42WP2NCS1 CSB42WP2NES1 CSB42WP2NFS1 CSB42WP2NHS1 CSB42WP2NKS1 CSB48WP2NCS1 CSB48WP2NES1 CSB48WP2NFS1 CSB48WP2NKS1 ZIS420NNHII ZIS420NNKII ZIS480NNBII ZIS480NNEII ZIS480NNFII ZIS480NNGII ZIS480NNKII ZISB360DNBII ZISB360DNEII ZISB360DNFII ZISB360DNGII ZISB360DNKII ZISB420DNBII ZISB420DNEII ZISB420DNFII ZISB420DNGII ZISB420DNHII ZISB420DNKII ZISB480DNBII ZISB480DNEII ZISB480DNFII ZISB480DNGII ZISB480DNHII ZISB480DNKII ZISS360DNBSS ZISS360DNESS ZISS360DNFSS ZISS360DNGSS ZISS360DNKSS ZISS420DNBSS ZISS420DNESS ZISS420DNFSS ZISS420DNGSS ZISS420DNHSS ZISS420DNKSS ZISS420NNBSS ZISS420NNFSS ZISS420NNGSS ZISS420NNHSS ISS420NNKSS ZISS480DNBSS ZISS480DNESS ZISS480DNFSS ZISS480DNGSS ZISS480DNHSS ZISS480DNKSS ZISS480DPESS ZISS480NNBSS ZISS480NNESS ZISS480NNFSS ZISS480NNGSS ZISS480NNKSS
The PDF may also contain information that applies to additional models not listed.