The disruptions were due to a system failure at Nordea that occurred on Tuesday morning.
By 2 pm, several of the problems had been resolved, but some disruptions still remain.
You may experience slowness when logging into the app, for example, says press spokesperson Hugo Laigar.
Nordea has experienced disruptions on several occasions recently, including due to overload attacks. The most recent one occurred as recently as October 3.
We are constantly working to have well-functioning IT systems and we are of course sorry every time it doesn't work for our customers, says Hugo Laigar.
Nordea in Denmark also experienced problems on Tuesday. Customers experienced issues with, among other things, internet banking and card payments, according to Danish TV2. The cause is stated to be a technical update.
Corrected: An earlier version contained an incorrect statement about the cause of the problems.