Hello all, looking to receive advice on my AC condenser. I had recently took the panels off and cleaned thee unit myself as it needed a little cleaning up inside and out. I went to use my AC cooling the next day, turned on my google thermostat, and noticed that the fan was running, but there was in fact no cooling coming from any of my vents. This had worked fine just a few months ago last season. Now all of a sudden, there’s not cooling or heating coming from my condenser. I ran my temperature really low, and I go outside to check my unit, and the unit itself is not running even tho the vents are just blowing air inside my home. 

I called in a technician to take a look. And from his diagnosis, everything within the condenser unit is receiving the correct voltage as it should, but stated that my board is bad and it would need replacing. He was also able to turn it on manually and stated that my board isn’t sending power to the rest of my unit. I had asked what could have caused this and the technician mentioned that it could have been a bad power outage. Which we did have an outage around a month ago that lasted for a couple hours during the night. And to replace the board, the technician quoted me just north of $900 to replace. I am a little suspicious considering that the board itself costs significantly less than that when I look it up online for my unit. What can I do myself to check what is wrong? I am still getting used to learning all things HVAC, so any help would be appreciated. 

AC condenser isn’t working