About 900 workers at Fisher and Paykel Healthcare's Highbrook, East Tamaki, plant will hold stop-work meetings before their planned strike action takes place on Wednesday.
Fisher and Paykel's Healthcare's production, maintenance and distribution workers are represented by the Engineering, Printing and Manufacturing Union (EPMU) and the National Distribution Union.
The EPMU's director of organising, Rachel Mackintosh, told APNZ that mediation last week did not resolve the matter "so the planned action is still on''.
"There will be a series of stopwork meetings for the membership tomorrow (Tuesday) to make sure that everyone is well informed,'' she said.
The EPMU - New Zealand's biggest private sector trade union - had sought a 5.7 per cent pay increase while Fisher and Paykel Healthcare had offered 3 per cent for 11 months, followed by a further 2 per cent for 11 months.