A statement on the banks website reads :
‘Due to scheduled IT maintenance Bank of Ireland confirms that there will be no service for our ATM/debit cardholders at any ATMs (Bank of Ireland/ non-Bank of Ireland) during the hours of 03.00 am to 07:00 am on Sunday, 22 May and from 01:00 am to 05:00 am on Monday 23 May.
Some ATM/debit card customers may also be unable to conduct point-of-sale transactions during the same period. Bank of Ireland credit card point-of-sale transactions will not be affected. Credit card holders won’t have service at Bank of Ireland ATMs but will have access to services at non-Bank of Ireland ATMs.
Customers who top up their mobile phone credit using our 365 Online or our mobile and tablet apps will have the credit applied once the service has been fully restored.
The Bank of Ireland ATM fleet in the Republic of Ireland, Northern Ireland and UK Post Offices will also be unavailable to any non-customers at that time.
We apologise to our customers for any inconvenience they may experience during this scheduled IT maintenance.’