My Heil AC Has A Blinking Green Light – Why And What To Do?

Nothing tops the kind of comfort that a cold environment brings. Your air conditioning unit, however, could occasionally encounter defects, such as blinking green lights, making you feel like it is the worst day of your life. But don't panic—you're in the right place! We have gathered all the information you need to know why and what to do next after you've seen your AC blink green lights.

A flashing green light from your Heil AC is an indicator that there is an internal problem with its system. Often, all you need to do is simply reset the unit. If it still does not do the trick, the next thing that you should do is call a professional, or check if any of the following has caused your AC to blink green lights: 

  • Voltage fluctuations
  • Clogged filters 
  • Failing compressor
  • Too low refrigerant 
  • Air conditioner settings

Jeez, you must still have a lot of questions in mind, especially if, after doing a reset, your AC is still flickering green light, and you couldn't identify which one of the answers above is also the cause. Either way, don't worry! Just read on, as we will explain every detail of the answers we have just provided. 

Air conditioner unit outdoors in side yard of a brick home in hot summer season. - My Heil AC Has A Blinking Green Light - Why And What To Do?

Troubleshooting A Blinking Green Light On Heil AC 

Air conditioners are vulnerable appliances that react quickly to minor changes detected by their systems. As soon as this happens, its first response would be to send off signals that something is wrong. 

Today, we'll look closely at a problem you may be worried about: A blinking green light in your AC. What could have caused this, and what does it mean?

Voltage Fluctuations

Remote controller of air condition and light switches

For air-conditioners to maintain their peak performance capability, power grids must generate a stabilized energy supply. However, climatic changes often bring about fluctuations in voltage. Voltage fluctuations can spike from producing very high voltage and become too low the next minute. 

Because modern-day ACs like Heil are highly sensitive, they are easily affected by voltage changes. Most AC units have a built-in protection system that is designed to safeguard their circuit board in the occurrence of voltage fluctuations.

Because of this, your unit might automatically switch to self-protection shutdown mode and consequently flash green lights. So, if it recently rained hard in your area, then best believe this is why.

Simply reset the AC unit and see if the green light stops blinking. If the blinking persists, remember never to attempt fixing your AC on your own because the risk for electrocution is high. This is the time when the help of a technician is already needed.

Clogged Filters

Recently purchased Heil ACs are, of course, much more efficient than old ones. As time passes, numerous inconveniences may be encountered by your Heil AC, such as clogged filters.

The longer you use your unit, the more it accumulates dirt, and the buildup it may cause could result in a clog in its filter. Despite this condition, the unit will continue to produce air even if it is already struggling to do so.

The green light in your Heil AC serves as a warning signal that it is time for you to clean your filter.  The longer your unit runs with clogged filters, the poorer the air circulation will be around your room, and it might damage your unit completely.

In this case, it would be best to clean your unit immediately. If you have no idea how, read through this article on "How To Clean A Heil Air Conditioner" for a step-by-step process for cleaning your AC mesh filter.

Failing Compressor

a professional electrician man is fixing a heavy duty unit of central air conditioning system by his tools on the roof top and wearing grey color of uniform and white cap

The heart of any air-conditioner is the compressor. The very role of the air-conditioning unit is to produce cool air, and it wouldn't be able to do so if the compressor is failing.

Failing compressors often occur if the AC is doubling its effort to produce cool air, just like in summer, for instance. Consequently, some parts of your AC might depreciate more quickly.

The best you could do to identify whether your compressor is failing is to notice its error codes and read the manual or by simply checking online to find out what it means.

The Refrigerant is Too Low 

Refrigerants are chemicals that create high-pressure liquid from low-pressure gas. Every air conditioning unit, including your Heil AC, needs a specific refrigerant level. Hence, at times when you fail to meet this level, it may cause your unit light to blink. 

The chemical in a refrigerant requires that it should only be handled by a professional. These professionals will use a meter to see if your unit is meeting the required refrigerant level. 

Air-Conditioner Settings

Woman hand with remote control air-conditioner on bedroom.

This is primarily applicable to multi-split air conditioners. Because multiple indoor units are extracting the power from a single outdoor unit, all of these must be in the same setting. In cases where there is a different mode setting, imbalances may occur and cause the unit's lights to start blinking. 

In these circumstances, the best at-home measure you could take is reading through the manual, which most likely contains the default settings the unit should have, and adjusting each accordingly.

If the manual seems unclear to you, calling a professional in the field to prevent the system from being damaged is a wise decision. 

How Do I Reset My Heil Air Conditioner? 

 Lowering the temperature in air conditioning unit for greener energy power consumption.

Before completely resetting your Heil air conditioner, you want to first turn off the unit. Next, you will have to locate your circuit breaker box and turn it off.

Hold down the reset button afterward. A good rule of thumb is to hold the reset button for about 5 seconds. After a minute, you could start turning on the switches again, and it should already stop blinking green lights.

Consequently, if the blinking persists, the next best thing to do is call a professional. 

For a more detailed discussion, check out this post on how to reset your air-conditioner

Where is the reset button located?

Reset buttons are usually small red buttons that appear on the front panel of the air conditioning unit. If you can find a small copper tube, trace it until you find its link with the other end of the pressure switch, and there you will find the reset button.   

How long does It take for an AC unit to reset? 

An AC unit typically takes about 30 minutes to reset fully. This time allotment also allows the internal circuit breaker to reset and perform efficiently.

Should I turn my AC off if it's not cooling? 

The most probable reason why your AC isn't cooling is because of a refrigerant leak or a non-responsive thermostat and air filter. In such a case, you should turn off your air conditioner and call a professional immediately.

If you want to ensure a longer lifespan for your Heil air conditioner, the best way for you to achieve this is through regular maintenance. 

What is the most common AC Repair?

Air Condition Service

Replenishing the refrigerant is the most common reason for an AC repair. Because air conditioners cannot function without the right level of refrigerant, a professional must fill them as soon as possible.

Nonetheless, various air-conditioning maintenance such as replacing air filters, thermostats, conditioner fans, capacitors, cleaning coils, and a lot more happen on a day-to-day basis. 

Is it worth it to repair an air conditioner? 

As soon as your air conditioner is showing signs that it is not functioning normally, and you don't know how to fix it, it would be best to call a professional technician for a repair.

If your AC has already been around for 8 years or longer, the costs for repair may be higher, and it would not be worth spending for this unless the defect is only minimal. 

Should I replace a 20-year-old AC unit? 

Although HVAC systems' average lifespan is around 15 to 20 years, these types of equipment become less efficient as time passes. The ideal time for you to consider replacing your AC unit is when it is already beyond 10 years old.

How Long do Heil AC units last? 

Heil air conditioners' average lifespan is about 10-20 years. Although Heil offers one of the most reliable ACs in the market, many factors may affect your AC's lifespan, such as regular maintenance.

It is also best if you find yourself a good contractor, as this may also help you in the longevity of your unit's life. 


All types of equipment wear out over time, especially if you fail to see some of the warning signs that it signals when it is already malfunctioning. 

If you do catch warning signs like a blinking green light on your Heil AC, the first thing you always want to do is to reset and see if it works. If it does not, call a technician immediately. 

Nevertheless, training yourself to be proactive in doing regular maintenance will ensure a longer lifespan for your appliance. Just like humans, a routine checkup and cleaning for your AC prevent the possibility of it from wearing out quickly.

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