Dealing with an air conditioner that will not turn on can be extremely frustrating, especially in the hot summer heat.
If you flip the switch on your AC unit and nothing happens, there is likely an issue that needs addressing.
HVAC 911 has identified some of the most common culprits when an air conditioning system fails to power on.
Identifying the root of the problem is the first step to getting your air conditioner back up and running. Some issues may be quick fixes you can tackle yourself, but major electrical or mechanical problems are best left to the professionals – such as the contractors affiliated with HVAC 911.
If you determine the AC problems are beyond your capabilities, connect with the trusted experts in your area through HVAC 911. Our network of contractors employ only highly trained and highly skilled licensed technicians.
Discover the most common reasons an AC fails to turn on and suggestions on how to determine the issue.
Main causes behind an AC not turning on
- Power connection problems
One of the simplest explanations for an AC not firing up is a problem with power or electrical connections. Check these items:
- A circuit breaker or fuse box connected to your air conditioner: Check to see if the breaker tripped or if a fuse blew. Reset any tripped breakers or replace blown fuses.
- The power cord and plug connections: Are there any loose plugs or exposed/damaged wires? Tighten any loose plugs and repair or replace damaged power cords.
- The disconnect box outside near the condenser: Make sure it is switched to the “on” position.
- Other electrical components like contactor relays, wiring and connections. Inspect them and look for signs of damage.
2. Failed capacitor
The capacitor provides the initial jolt of energy the AC motor needs to turn on. If it fails, the compressor may hum but not start. Signs of a bad capacitor include:
- The fan spins, but the compressor does not start.
- A loud humming sound, but the unit will not start.
You will need to call a professional, such as the contractors affiliated with HVAC 911 to confirm this diagnosis and make the repair.
3. Faulty control board
The control board directs the AC system to produce cold air and maintain set temperatures. If it is faulty, it cannot send signals to turn on the unit. Symptoms include:
- Erratic operation, such as repeatedly turning on and off.
- The fan works, but unit is not cooling properly.
An HVAC service technician can test and replace the board. Due to the cost of new boards, this work is best left up to the professionals that are part of the HVAC 911 network.
4. Refrigerant issues
Lack of adequate refrigerant due to leaks or undercharging during installation can prevent proper operation. Signs include:
- The system runs but provides little cooling.
- Frost buildup on refrigerant lines.
- A noisy AC system: Your system may be noisier than usual. Bubbling or gurgling noises can indicate a fault within the system if there is a refrigerant leak somewhere in the lines.
Properly trained technicians have tools to diagnose pressure issues and can recharge your refrigerant to optimal levels.
Next Steps to Get Cool Air Flowing
While the troubleshooting tips above may help pinpoint the cause, we always suggest calling an HVAC expert for complex electrical issues or AC repairs. While there may be simple fixes most homeowners can undertake, the bulk of the work should be performed by properly trained service technicians.
After all, the cost to fix an AC unit is usually much cheaper than getting a new unit installed.
The contractors within the HVAC 911 network employ only highly trained and licensed technicians. They have the experience, equipment and skills needed to quickly diagnose AC problems. After identifying issues, they always explain repair options and provide fair, reasonable quotes on parts and labor.
Getting your unit back up and running properly is their top priority, so you can stay comfortable even during sweltering summer heat waves. Get referred to a trusted, contractor in your area today by calling HVAC 911.
