The machines would not accept the new notes because they were set up to be extremely sensitive to fake banknotes. Any changes to the notes registered as a forgery, Mr Smith said.
The problem was not new - every time New Zealand's banknotes were changed in any way the machines had to be reprogrammed.
The necessary software solution had been emailed yesterday to the council by the machines' Austrian suppliers, Mr Smith said.
Council staff would use that software to reprogram the affected machines today.
Mr Smith said all the affected council-owned machines had intercom buttons and motorists were urged to use them if they had any problems.
Staff members helping affected motorists had the discretion to allow motorists free parking.
''Generally, we'd be more lenient because it's our problem, not their problem, and [the new notes] are legal tender.''
Meridian mall centre manager Michael Porter said staff had been working for weeks to ensure the new notes did not create any problems, but their German parking ticket machine supplier was still a week away from providing the necessary upgrades.
In the meantime, motorists could use the machines' credit card and eftpos facilities, other forms of cash, or contact the on-site ''car park porter'' for assistance.
Nationwide parking giant Wilson Parking had also run into the same problem, head of strategy and content Stephanie Jones said.
All the company's ticketing machines, including those in its 19 Dunedin CBD car parks, were ''in the process of being upgraded to accept the new banknotes''.
That process was expected to be completed by mid-November.
New $20, $50 and $100 notes are likely to be released in April.
