I'll just keep guessing, answer 21. If it is for a sump pump, I gave seen them (cycle) chatter because it was oversized. Starts up and drains sump, shuts off, check valve not working and pumped up water comes back down pipe to sump. Repeat repeat repeat.
A cowboy may get thrown , but they always get up and walk forward.
A water logged pressure tank can cause some rapid cycling, not sure if I would call it chatter but we don't know what the OPs definition is either.