Error: 503 main domain ,but sub domain ok

[nzworksh]

Error: 503 main domain ,but sub domain ok.

main domain:
http://www.nz-workshop.co.cc (addon)
http://nzworkshop.x10.mx

• html -> ok
• php -> 503

​

sub domain:
(admin pages)

• html -> ok
• php -> ok
​

please help