Te Whatu Ora said a "significant" ICT outage is expected to cause delays at local hospitals across the lower North Island.
In a statement, the health agency said the outage is causing disruption to systems at Wellington Regional Hospital, Kenepuru Community Hospital, Ratonga Rua o Porirua, Hutt Hospital and Wairarapa Hospital.
"The fault was identified at approximately 4am today and was caused by an internal cooling infrastructure failure that caused a number of servers to overheat and shut down," it said.
"Applications running on those servers automatically switched to the remaining servers, however the increased load has caused disruption and delays to a range of both clinical and support systems."
Te Whatu Ora said the cooling issue has been resolved and services are being restored, and no external causes contributed to the outage.
"Hospital services continue to see patients for outpatient appointments and planned care and procedures — however patients may experience delays due to our systems currently running more slowly than usual," the agency warned.
"Our teams are working hard to minimise the impact on patients, and we ask people to please be respectful of our staff and one another.
"Anyone who is not able to have their appointment or procedure today will be rescheduled for the next available opportunity."
Patients are advised to keep an eye on the websites for Capital & Coast DHB, Hutt Valley DHB and Wairarapa DHB for updates.
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