You can get that from in input voltage of 240 or from any of a number of ways it could have been incorrectly wired.
Having answered the theory question, I will now close this thread, in accordance with forum rules. This forum is intended to assist electricians, electrical contractors, inspectors, engineers, and other members of the electrical profession with their job related duties. If you are not an electrician, we are not permitted to help you perform your own electrical troubleshooting, installation, or maintenance work.