Brand New AC Unit Not Cooling: Causes and Solutions Explained

Purchasing a brand new AC unit is an exciting moment, but it can be frustrating when it's not cooling properly. This can be due to a refrigerant leak, which is a common issue that can be caused by a faulty installation or a manufacturing defect.

In some cases, the AC unit's thermostat might be set incorrectly, leading to poor cooling performance. This can be easily fixed by adjusting the thermostat settings.

A clogged air filter is another common cause of poor cooling performance. According to our article, a clogged air filter can reduce airflow by up to 20%, leading to decreased cooling capacity.

Proper installation is crucial for the AC unit to function correctly. If the unit is not installed correctly, it can lead to poor cooling performance and even damage the unit itself.

Check this out: Air Con Water

The new AC unit not cooling could be due to a faulty compressor, which is a common issue in air conditioning systems.

The compressor is the heart of the AC unit, and if it's not working properly, the entire system will not cool.

A bad capacitor might be the culprit, as suggested by bitshift, who noted that the capacitor readings were 35ish microF on the Herm terminal and about 4ish on the Fan side, which is not within the normal range.

However, this could also be a sign of a more serious issue.

The compressor contactor might not be working, as JACK mentioned, which could prevent the compressor from kicking in.

Checking the voltage across the contactor's terminals would be a good starting point to determine if it's functioning correctly.

The liquid line and evaporator should be cold if the compressor is running, but if they're not, it could indicate a problem with the refrigerant flow.

The fact that the copper lines are not cold suggests that the compressor is not running, or at least not running properly.

Here are some possible causes to consider:

These are just a few possible causes, and it's always best to consult a professional to determine the root cause of the issue.

The new AC unit is not blowing cool air, and the owner suspects it's not a leak of coolant. The owner has checked the filter and found it to be fine.

The compressor is running, but the air coming from the vents isn't cold. This suggests that the compressor might not be kicking in properly.

The owner has checked the capacitor and found it to be fine, with a reading of 35ish microF on the Herm terminal and about 4ish on the Fan side.

The liquid line or evaporator might not be cold, and neither of the copper lines are cold, which could indicate a problem with the compressor.

Checking the compressor contactor is a good idea, but the owner is waiting for a technician to check it out.

A different take: Air Conditioner Makes Room Humid

If your brand new AC unit isn't cooling, it's likely due to a refrigerant leak. This is often caused by a faulty installation or a manufacturing defect.

A clogged air filter can also prevent your AC from cooling effectively, as it reduces airflow and puts extra strain on the unit. This can be easily fixed by replacing the filter.

A low refrigerant charge can also cause your AC to not cool properly, which might be due to a leak or a malfunctioning condenser coil.

You might enjoy: Filters for Ac Unit

Incorrect Thermostat Setting can be a major culprit behind an air conditioner not working as expected. It's a simple mistake, but it can be frustrating.

First, check that the air conditioner is switched on. This might seem obvious, but it's a common oversight.

The thermostat setting needs to be in the correct mode, whether it's cooling or heating. If it's set to the wrong mode, the air conditioner won't do its job.

Check the temperature setting on the thermostat as well. If it's not set low enough, the air conditioner won't turn on.

For your interest: Window Ac Unit Not Blowing Air

Here's a quick checklist to ensure your thermostat setting is correct:

By double-checking these settings, you can often resolve the issue without needing to call a repair technician.

A broken compressor is a common problem that can leave you feeling hot and bothered. It's the compressor's job to suck out hot air from your home and dump it outside, making cold airflow possible.

If the compressor is damaged, the AC won't work properly, as seen in Example 2. This problem might have originated during shipment, with the AC being damaged in transit or not properly cushioned in its container.

Replacing the compressor can be very expensive, so it's worth exploring return options. Check your return policy for the air conditioner to see if you can return the appliance since you received a faulty one.

It's worth noting that in Example 1, the compressor is running, but the air coming from the vents isn't cold. This could be a sign of a more complex issue, but it's worth checking the compressor's status first.

Here's an interesting read: Ac Unit Not Draining Properly

Here are some possible reasons for a broken compressor:

In either case, it's essential to have a professional inspect and diagnose the issue to determine the best course of action.

The AC filter may be dirty or clogged, restricting airflow and preventing the AC from cooling.

A dirty or clogged filter is a common issue that can be easily fixed.

You can have the AC filter cleaned or replaced.

It's recommended to have an expert help remove any material clogging the filter.

They can also assess the filter for damage and replace it if necessary.

A blocked condenser coil can make your air conditioner produce less cool air than usual. This can happen when the coil freezes over.

During certain times, airflow is reduced, making air conditioning less effective than usual. The air conditioner will no longer produce cool air if the condenser coil freezes.

Debris or thick grass can block the airflow around the unit intakes, causing a lack of cooling. Keep the grass and bushes away from your brand-new AC unit using a string trimmer.

See what others are reading: Will a Bigger Ac Unit Cool My House Better

Registers and ducts play a crucial role in delivering cool air throughout your home. If they're not properly installed, it can drastically affect the air conditioner's performance.

Cool air can leak from ducts before entering the home, making the A/C seem like it's not cooling at all. The registers, which are the vents that blow the cool air into the house, need to be open to allow the air to flow in.

If the registers are in a closed position, the air can't get into the house. You should check your ducts for air leaks and make sure your registers are all open completely to maximize cooling.

Recommended read: How Many Square Feet Will 3 Ton Ac Unit Cool

If your window AC is not cooling, it's likely due to a simple reason. Dry mode, also known as the Dehumidifier, is a common culprit. Its job is to remove moisture from the air or dry it out, but it can also prevent the AC from cooling.

Check if your AC has a dry mode setting and try switching it off. If that's the case, you might have inadvertently activated it, and it's not cooling your space as a result.

Make sure the AC is set to the correct mode, as some models have different modes for different temperatures.

First, check which mode your window AC is on, as this could be the simplest solution to the problem.

If it's not in cool mode, try switching it to this setting and see if the issue resolves itself.