If psi is red, what is required?

• A. Replace air vent
• B. Replace go-no-go fuse
• C. Change elements at once
• D. Change entire system

Answer: (C)

When the psi indicator turns red, it signals that the filtration elements have reached the end of their usable life and must be replaced. The best action is to change both filter elements at once. Replacing both ensures that the filtration stages perform as designed and prevents old media from compromising the new element or causing uneven flow. If only one element is changed, the remaining old element can still be degraded and may reduce filtration efficiency or create bypass paths. Replacing just an air vent, a fuse, or the entire system isn’t the prescribed response to a red psi indicator; element replacement is the appropriate maintenance step to restore proper filtration. After replacing, reassemble correctly and verify the system operates with proper flow and no leaks.