Nearly 2,000 homes were left without any phone or internet connection after rats reportedly chewed through the network cables over the weekend.
The blackout hit residents in the Torridge area of Devon with engineers for Openreach working to resolve the issue.
Households in Bideford, Clovelly, Hartland, Horns Cross, Parkham and Woolfardisworthy are all understood to be affected.
The disruption comes a week after Torridge households suffered a 22-hour outage between October 9-10.
An Openreach spokesman said: “Our telephone and broadband network in and around the Bideford, Clovelly, Hartland and Horns Cross exchange areas has been damaged by rodents.
“The outage is currently affecting approximately 1,800 customers. Our engineers are working hard to get the repairs done quickly and safely; we don’t have an estimated repair time yet but will keep you updated as they progress.”