Mr Fitzmaurice said there was discussion about some form of protest on Wednesday, but the union had decided it was too important a day for firefighters and no one wanted to disrespect the memory of those who died.
"We definitely don't want to use that day- although it's very tempting - as some way to further our claim, out of respect to everybody," he said. "I'm quite sure some will choose to go and some will choose not to go, but that's a personal choice."
A repercussion of industrial action being taken was that firefighters were not allowed to take their fire appliances from fire stations for anything other than emergencies, Mr Fitzmaurice said.
"And it's our understanding that that prevents us, especially those on-duty staff, going [to the commemorative service]."
However the Fire Service this morning said that was not correct.
A spokeswoman said on-duty staff had been told they could take their fire appliances to the event.
New Zealand Fire Service chief executive and national commander Paul Baxter said there would be an official representation by the Fire Service and that they were "facilitating the attendance" of as many on-duty Christchurch staff as possible who wanted to take part.