The Irn-Bru First Division club's players have been experiencing delays in payments for several months and only received the final part of their January wages earlier this week.
And PFA Scotland said there was "little prospect of payment in full in the immediate future" for this month's wages.
Chief executive Fraser Wishart said in a statement: "Our members have shown a great deal of patience and understanding in recent months. Players at that level are not highly paid therefore any delay in payment of wages can lead to hardship, inconvenience and upset.
"As professional footballers they understand the importance that a football club has in the eyes of the fans and the community and they thank those who have sent messages of support.
"There comes a time however when as a squad they have to make a stand and invoke their statutory rights.
"In addition to the late payment of salaries there are outstanding win bonuses and appearance monies due for quite some time.
"The club has advised our members that they are unable to provide an undertaking that the outstanding sums will be paid and so appear not to be able guarantee a remedy to the contractual breaches.
"PFA Scotland has therefore been instructed to intimate a formal complaint to the SFL for illegal deduction of our members' salary and for breach of contract by the club."