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My Air Conditioner Won’t Turn On

My Air Conditioner Won’t Turn On - Service Champions

There are few things more frustrating than your air conditioning system not working when you need it. What do you do if your AC won’t turn on?

There are 5 likely culprits when your air conditioning system won’t turn on. Some you can check yourself, and some you should call a professional to safely evaluate the situation.

Homeowner’s Guide To The 5 Reasons Your AC Won’t Turn On

Reason #1 Air Filter

The first thing you should check is your air conditioner’s filter. Some units will turn themselves off and not turn back on again until the clogged air filter is replaced with a new, breathable one.

This is a good feature for your AC system to have as it is done for safety and efficiency. Learn how to change an HVAC filter.

Reason #2 Thermostat

If the filter is clean, check your thermostat to make sure it is working properly. Make sure it has power and is set to cool or heat. If you have an electromechanical thermostat, it needs a good cleaning occasionally.

A broken thermostat can easily disable an entire AC system. If you’ve gone through the steps to make sure your thermostat has working batteries and is clean and level, your problem may be with your home’s circuit breaker or power supply.

Reason #3 Power

If your air conditioning system isn’t receiving power, check the breaker box for any tripped breakers. Flip the breaker all the way off before flipping it back on again.

Important: If you flip the breaker but it continues to trip, don’t restore power until you have had a licensed technician inspect the wiring. If you don’t have any power at all, contact your utility company.

Contact a licensed and insured HVAC company to diagnose and repair any unsolved power problems. The technician may need to repair or tighten wiring or loose terminals.

Reason #4 Clogged Outdoor Unit

Another possible reason your AC isn’t turning on is that a lot of leaves, grass, and other debris could be clogging your unit’s outdoor condenser fan and fins. If you suspect this might have happened, either schedule a professional tune-up and cleaning or learn how to clean the condenser unit yourself.

Reason #5 Bad Transformer, Contactor, or Relay

The transformer and contactor are electric motor controls that are used to turn on the air conditioner or heat pump. If they aren’t working anymore, you will need to contact a licensed professional for replacement.

For help pinpointing the problem with your air conditioner, refer to our Heat Pump Troubleshooting and Repair Chart. If you have any questions, don’t hesitate to Ask a Champion.

Service Champions is the premier HVAC provider for Northern California, including Pleasanton, Livermore, Concord, Rocklin, and San Jose. Call or click today to schedule your precision air conditioning tune-up and cleaning.

My Air Conditioner Won’t Turn On - Service Champions

There are few things more frustrating than your air conditioning system not working when you need it. What do you do if your AC won’t turn on?

There are 5 likely culprits when your air conditioning system won’t turn on. Some you can check yourself, and some you should call a professional to safely evaluate the situation.

Homeowner’s Guide To The 5 Reasons Your AC Won’t Turn On

Reason #1 Air Filter

The first thing you should check is your air conditioner’s filter. Some units will turn themselves off and not turn back on again until the clogged air filter is replaced with a new, breathable one.

This is a good feature for your AC system to have as it is done for safety and efficiency. Learn how to change an HVAC filter.

Reason #2 Thermostat

If the filter is clean, check your thermostat to make sure it is working properly. Make sure it has power and is set to cool or heat. If you have an electromechanical thermostat, it needs a good cleaning occasionally.

A broken thermostat can easily disable an entire AC system. If you’ve gone through the steps to make sure your thermostat has working batteries and is clean and level, your problem may be with your home’s circuit breaker or power supply.

Reason #3 Power

If your air conditioning system isn’t receiving power, check the breaker box for any tripped breakers. Flip the breaker all the way off before flipping it back on again.

Important: If you flip the breaker but it continues to trip, don’t restore power until you have had a licensed technician inspect the wiring. If you don’t have any power at all, contact your utility company.

Contact a licensed and insured HVAC company to diagnose and repair any unsolved power problems. The technician may need to repair or tighten wiring or loose terminals.

Reason #4 Clogged Outdoor Unit

Another possible reason your AC isn’t turning on is that a lot of leaves, grass, and other debris could be clogging your unit’s outdoor condenser fan and fins. If you suspect this might have happened, either schedule a professional tune-up and cleaning or learn how to clean the condenser unit yourself.

Reason #5 Bad Transformer, Contactor, or Relay

The transformer and contactor are electric motor controls that are used to turn on the air conditioner or heat pump. If they aren’t working anymore, you will need to contact a licensed professional for replacement.

For help pinpointing the problem with your air conditioner, refer to our Heat Pump Troubleshooting and Repair Chart. If you have any questions, don’t hesitate to Ask a Champion.

Service Champions is the premier HVAC provider for Northern California, including Pleasanton, Livermore, Concord, Rocklin, and San Jose. Call or click today to schedule your precision air conditioning tune-up and cleaning.