At the end of January, written undertakings and assurances that the company, the independent directors, and the bank had relied on, changed unexpectedly.
"This led to the bank withdrawing support and despite exhaustive efforts by many people, a binding commercial solution was not able to be achieved. At that point the independent directors felt they had no choice but to resign," they said.
Yan, citing difficult trading conditions and withdrawal of shareholder support, put the company into receivership on Wednesday.
Mainzeal, the country's third biggest construction company, has suffered from a "series of events that had adversely affected the company's financial position", combined with a general decline in commercial construction activity and lack of shareholder support, Yan said.
PwC partners Colin McCloy and David Bridgman have been appointed receivers.
Mainzeal, the largest construction company behind Fletcher Construction and Hawkins Construction, employs around 400 people.
It has been involved in $7.5 billion worth of projects, including Vector Arena and the Two Double Seven shopping centre in Auckland and the Supreme Court in Wellington.
It is understood the receivership was over the failure to make a $1.8 million payment on an outstanding $20 million credit facility.