What happens to PF if one switches to a non-EPF-covered job? 

Individuals who move to a job where EPFO-managed provident fund (PF) is not applicable stop making regular contributions to their EPF account, similarly the employer also stops. One cannot make regular contributions to the PF, however, the account balance does not disappear, it remains in the account. The EPFO credits interest in the account until one turns 58 years old.