What is a normal amount of rust / what failed? 8-year old Carrier FV4C FCU

Carrier Fv4c Installation Manual

Fcu amount failed What is a normal amount of rust / what failed? 8-year old carrier fv4c fcu

What is a normal amount of rust / what failed? 8-year old Carrier FV4C FCU

What is a normal amount of rust / what failed? 8-year old Carrier FV4C FCU
What is a normal amount of rust / what failed? 8-year old Carrier FV4C FCU