There isn’t one per say that I know of. There is a filter that should be cleaned/checked periodically to protect the pump from lint. We do clean the exhaust hose every year or so for lint. I can’t say we use the dryer much though. In the winter, we put towels in after showering for 20 minutes to keep them from getting “wolfy”. The clothes mostly get hung out to dry. We been using ours for 10 years with the only issue being being the door latch.
http://www.splendide.com/cleanfilter.pdf