"We maintain all of our appliances to ensure they are fully operational, safe to use and fit for purpose," Dravitzki said.
"Fenz has more than 1240 fire trucks and specialist response vehicles across the county and, in any large vehicle fleet, it is expected there may be issues from time to time.
"That's why our vehicles are serviced regularly and we have plans in place to cover trucks that may be off the run."
Another post on the union's Facebook page on July 3 stated the ladder truck had gone offline just days after its return after breaking down last month.
This meant during that time a truck would have to travel from New Plymouth or Palmerston North if a ladder was needed.
Later that day, the union announced the last remaining aerial appliance in the lower North Island, capable of reaching heights up to 32m, had broken down.
"There are no spare parts in the country to repair faults found in the truck's cooling system," said the post on the Facebook page.
"As well as no spare parts, Fire and Emergency NZ has run out of spare appliances of this type to take its place."