Subdomain is Being Redirected to Main Domain and Refresh Every 2 Sec Sec

Hi My main domain is hl-trades (dot) com which already have ssl installed. My Subdomain is nova.hl-trades (dot) com which does not have ssl installed from cpanel.

When i try to open subdomain it redirects to main domain and main domain keep on refreshing in a loop every 1-2 sec.

All my DNS seems ok. kindly help.