Below is a employee warning letter format

Emp. no.

It is reported/alleged against you that, you
Mr.___________Emp. No ______Designation_________________are found ( Give reason).
Following are the complaints against you.

This act of your as mentioned above constitutes misconduct as per the certified Standing Orders of the Company.

Therefore your are hereby required to give your written explanation as to why suitable action should not be taken against you for the said misconduct.
Your written explanation should reach us within 48 hrs of receipt of this notice.

Failing of which will be understood that you have no explanation to offer and action deemed fit shall be taken against you.

(The signatory)