Its been out of service more than in service.
Check it out:

HealthCare.gov will be out of service for two and a half days beginning on Feb. 15 — the last day people can sign up to obtain coverage that begins on March 1.

The Centers for Medicaid and Medicare Services announced in a blog post on Monday that the ObamaCare website would be down so the Social Security Administration can conduct its annual systems maintenance activities.

The site will be out of order from 3 p.m. on Feb. 15 until 5 a.m. on Tuesday — a period that coincides with the long holiday weekend.

Those seeking coverage by March 1 must have signed up online by Feb. 15, but with the website down, those registering last-minute won’t be able to find out what plans or subsidies they qualify for.

The CMS is encouraging these users to call a hotline to complete the process.