Service Bulletin Description:
After replacing the control board the vent fan runs on one speed only.
This Service Bulletin PDF download contains information for the following:
FMV157GBA, FMV157GCA, FMV157GMA, FMV157GQA, FMV157GSA, CFMV157GBA, CFMV157GCA, CFMV157GMA, CFMV157GQA, CFMV157GSA
The PDF may also contain information that applies to additional models not listed.