Outside AC Unit Won't Turn On? What to Do Before Calling Apr 15, 2015What to Do Before Calling for Repairs. April 15, 2015. If there was a power surge, your air conditioner might have blown a fuse or tripped a circuit breaker. Most air conditioners have a shut-off switch near the outside unit. It’s usually a metal box that’s hanging on your house. If someone has recently worked on the AC, they mayAir Conditioning · Repair & Maintenance AC repairs: The real reasons behind blown AC fuses May 18, 2016However, homes that still have fuse boxes will be familiar with the headache of a blown fuse. What you may not know is that it is a very common issue that can indicate an AC unit in need of repairs. In summer, when you least want to deal with air conditioner problems, your machine is more prone to blown fuses that will require repairs.