The cell banking app and web banking had been down at Britain’s greatest constructing society.
Nationwide’s on-line providers had been offline since round 3pm on Tuesday.
It apologised “for any problems this may cause”.
“We’re working to get things back to normal as quickly as we can,” it added.
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Direct debits and standing orders had been working usually, and prospects may nonetheless use playing cards on-line and in outlets, withdraw cash from money machines and obtain funds.
Initially, Nationwide stated some prospects had been unable to entry the app or web banking and advised customers to attempt once more later.
At 2.44pm 1,900 customers reported points with Nationwide providers on the Downdetector web site, however the service was again working round 4pm.
The problem of financial institution outages has been examined by the influential Treasury Committee of MPs after providers at a number of excessive avenue lenders had been disrupted for 2 pay days in a row.
In response to a February letter from the committee, Nationwide stated it had seven incidents of IT failure, impacting prospects for 1,577 minutes in 2023, which rose to 11 incidents in 2024 for two,649 minutes.
Whereas the general variety of prospects impacted couldn’t be recorded, Nationwide stated 1.99 million transactions had been affected throughout the 2 years, which represents roughly 0.03% of all transactions over the interval.
The failures had been attributable to “technical faults in hardware or software”, or on account of an outage following a deliberate improve or change to Nationwide methods, the March letter learn.
