Chase CEO Jamie Dimon issued a public apology to the bank's 16.5 million online banking customers after a computer glitch knocked out the site for more than a day.
The Chase Website went down late Monday evening, forcing the bank to put up a holding page indicating that the downtime was due to "scheduled maintenance".
Oddly, the bank hadn't forewarned customers of any maintenance issues and by Tuesday morning had replaced the message with a simple notice saying merely that the site was "temporarily unavailable".
In the afternoon, Chase CEO Jamie Dimon apologised to customers for the outage at a banking conference in New York.
The lights eventually came back on on Tuesday evening, although the bank has yet to provide an explanation for the source of the problems, leading to rampant speculation on online message boards and Twitter.
Chase is the latest top tier bank to have problems with its online outlet following in the wake of DBS Bank of Singapore and Barclays which have both experienced extended downtime in recent weeks.
Update The Chase Website crashed again Wednesday afternoon before power was restored later that evening. Bank spokesman Thomas Kelly told the New York Times that the fault was caused by third-party database software that corrupted information in its systems and prevented users from logging on.