May Require Emergency Service

AC Won't Turn On? Troubleshooting & Repair

When your AC won't turn on at all, it can be frustrating and uncomfortable. This could be a simple electrical issue or a sign of a more serious problem requiring professional diagnosis.

Call (650) 397-7060 Schedule Diagnosis

Signs & Symptoms

!Nothing happens when you turn on the AC

!Thermostat is blank or unresponsive

!You hear a click but unit doesn't start

!Outdoor unit doesn't run

!Indoor fan runs but outdoor unit doesn't

!AC trips the circuit breaker

Possible Causes

-Tripped circuit breaker
-Blown fuse in disconnect box
-Thermostat issues (dead batteries, bad wiring)
-Faulty capacitor
-Bad contactor
-Compressor overload tripped
-Safety switch activated (drain pan full)
-Faulty compressor
-Electrical wiring problems

DIY Troubleshooting Steps

Try these steps before calling a professional (unless it's an emergency):

1Check and reset circuit breaker
2Replace thermostat batteries
3Verify thermostat is set correctly
4Check outdoor disconnect switch is on
5Look for ice on unit (could cause shutdown)
6Wait 5 minutes after turning off before restarting

When to Call a Professional

!Circuit breaker keeps tripping
!You smell burning or see smoke
!Unit makes humming sound but won't start
!Problem persists after checking breaker and thermostat
!Outdoor unit's fan doesn't spin
!You hear clicking but no startup

Estimated Repair Costs

Diagnostic: $89-$129

Minor Repair: $150-$350

Major Repair: $400-$2,500

Minor fixes include capacitor, contactor, or thermostat replacement. Major fixes include compressor or motor replacement.

Prevention Tips

* Schedule annual AC maintenance

* Replace thermostat batteries yearly

* Keep area around indoor and outdoor units clean

* Don't ignore warning signs like strange sounds

* Consider surge protector for HVAC system

Frequently Asked Questions

Why won't my AC turn on at all?

Start with the basics: check your thermostat settings, replace batteries, and verify the circuit breaker hasn't tripped. If those are fine, you likely have a capacitor, contactor, or compressor issue requiring professional repair.

What if my AC keeps tripping the breaker?

Repeated breaker trips indicate a serious electrical issue - possibly a failing compressor, short circuit, or ground fault. Stop trying to run the unit and call a professional immediately to prevent damage or fire risk.

Need Help?

This issue may require emergency service. Call now for immediate assistance.

(650) 397-7060 Schedule Online

* 15+ Years Serving the Bay Area

* Same-day diagnosis available

* Upfront pricing

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