To be fair, you need more information than just that....
What build up of cladding is on the timber frame? (insulation and render? board and render? expanded metal lath and render? block and render?)
There are some very good rendered cladding systems for use on timber frames that have BBA, and other have other 3rd party accreditation, that with general and simple maintenance will last up to 60 years (BBA advance age systems to a minimum 30 years)
See if you can get more information ... who built it? (known house builder or self builder?) what does it look like now? How old is it? Etc...
There is a lot of experienced guys on here who can assist and comment, but if you can get more specific information, you could track back to the system supplier and get formal advice
Good luck