How old is your aircon & what model is it?
Depending on age & model, it may be worth it to repair. But if it's very very old, then may not be worth repairing.
Is it the electronic motherboard that's faulty? Or the switchboard?
I have a reliable A/C guy to recommend. My husband's friend. Father & son team, very honest but they are quite busy. If you want to ask them for a quote to compare, email me.