Hi,
Though I am not sure about G7 server. However, I have got few Gen8 and Gen9 servers documents related with Fan issues.
https://support.hpe.com/hpsc/doc/public/display?docId=mmr_sf-EN_US000012648
May be this can be of some help to you.
In case the issue persist, you may contact HPE Contact Center for help.
Regards