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AC Not Turning On

Air conditioner won't turn on at all? Here are the common reasons and what to do.

This may need urgent attention

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Common Symptoms

If you're experiencing any of these symptoms, you may have this problem:

AC unit is completely unresponsive
No sound from indoor or outdoor unit
Thermostat display is blank
AC trips circuit breaker immediately

Possible Causes & Solutions

Tripped Circuit Breaker

DIY Possible

Reset the breaker in your electrical panel

Thermostat Problems

DIY Possible

Check batteries, wiring, and thermostat settings

Blown Fuse

Pro Required

Check and replace fuse in disconnect box

Capacitor Failure

Pro Required

Professional capacitor replacement needed

Contactor Issues

Pro Required

Professional inspection and replacement required

Safety Switch Triggered

Pro Required

Check condensate drain, call professional if needed

When to Call a Professional

While some issues have DIY solutions, HVAC systems are complex. Call a professional when:

  • DIY solutions don't resolve the problem
  • The issue involves electrical components
  • You smell gas or burning odors
  • The problem returns after temporary fixes
  • Your system is under warranty (DIY repairs may void it)
Call San Jose HVAC Pros: (650) 397-7060

Related Services

AC Repair

Expert diagnosis and repair for all AC makes and models

$89-$500+

Thermostat Installation

Upgrade to smart thermostats for comfort and savings

$150-$400

Emergency HVAC

Round-the-clock emergency HVAC repair service

$150+ service call

Frequently Asked Questions

Why is my AC blowing warm air?

Common causes include low refrigerant, a dirty air filter, frozen evaporator coils, or a faulty compressor. Our technicians can diagnose the exact issue.

How much does AC repair typically cost?

AC repairs typically range from $89-$500+ depending on the issue. We provide upfront pricing before any work begins so there are no surprises.

Should I repair or replace my AC unit?

Generally, if your unit is over 10-15 years old and repairs exceed 50% of replacement cost, replacement is often more economical in the long run.

How long does an AC repair take?

Most common repairs are completed in 1-2 hours. More complex issues or those requiring parts may take longer, but we always communicate timelines clearly.

Related Problems

AC Not Cooling

Is your air conditioner running but not cooling your home? Learn the common causes and solutions.

AC Water Leak

Water pooling around your AC unit? This could cause water damage. Learn why it happens.

Noisy AC

Unusual sounds from your AC? Different noises indicate different problems. Find out what yours means.

Need Help With AC Won't Start?

San Jose HVAC Pros technicians are ready to diagnose and fix your problem

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