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If an E1 error code shows up in your air handler, that means there is a communication error either with the indoor unit or the outdoor unit. The causes for this could be a wiring mistake, or a faulty control board with the indoor unit or the outdoor unit. Troubleshooting An E1 Error CodeOne thing you can do to try and troubleshoot the E1 error code is power off the MRCOOL DIY mini split then wait two minutes and restart it. If the E1 error code displays again, however, you may want to measure the unit's voltage. If you are not comfortable working with electricity, you may want to call MrCool tech support at 270-366-0457. For the outdoor unit, take off the side wiring cover with a screw driver. Then, using a multi-meter, test the voltage. For a unit running off of 120 volts, touch the ends to L1 and Ground. For a unit running off of 240 volts, you will want to touch the ends to L1 and L2. For the indoor unit, you will want to place the ends of the multi-meter on 1 and 2 to make sure the unit is getting voltage. For a 120 volt unit, you will want to go between 1 and Ground. Doing these things will help you determine if the unit is wired correctly. If it is not a wiring issue, it is possible your control board may need to be replaced in either the indoor unit or the outdoor unit. This is when it is important to call the MRCOOL Warranty Department so they can help you determine the reason for the E1 error code. Other MrCool DIY Error Codes
Disclosure: We may get commissions for purchases made through links in this post. Is your Carrier air conditioner acting up and is displaying an error message? And you're wondering, what does it mean? How to fix it? We researched some common error codes of a Carrier air conditioner, and here is what we found. Each error message has a meaning that helps users comprehend the issue. Here are some common error codes you can see on a Carrier air conditioner and their meaning:
Continue reading to learn more about Carrier air conditioner error codes, what they mean, and how to troubleshoot them. What Are Other Common Carrier Air Conditioner Error Messages?There is a long list of Carrier AC error codes, but here are some that you might encounter: Indoor unit:
Outdoor unit:
What Causes A P4 Error Code In Carrier ACs?As mentioned, if your Carrier air conditioner displays a P4 error code, it means that there is an error in the inverter compressor drive. This error is can either be caused by:
How To Fix E4 Error Code In Carrier ACs?Technically, the E4 error isn't even an error. It indeed informs you that your unit is about to defrost. However, this indicates that something has caused your unit to become excessively chilly. A damaged temperature sensor can potentially cause defrost mode. There is nothing to do when the unit goes into defrost mode. Your system will operate in protected mode until it is safe to use as an air conditioner. When your air conditioner no longer detects ice on the evaporator coil, it will resume normal operation. When your air conditioner has an E4 problem, you may do several maintenance tasks to keep it running. These are:
What Does E1 Error Code In Carrier Air Conditioner Indicate?For Carrier AC units, the E1 error code indicates something wrong with your indoor/outdoor units' communication. Other possible explanations for an E1 error code include:
How To Fix E1 Error Code?Wiring mistakes are the root of most communication problems. The communications part of the control circuitry could be damaged if the connection wires are not correctly connected. To troubleshoot this error, you need to:
If all of the aforementioned are in working order, the problem is most likely caused by one or both of the control boards. There is no way to tell which board is faulty on most models. Replacing the control boards one at a time is the best method. The outdoor board is usually easier to replace, but the indoor board is typically the one that fails. Brownouts, blackouts, voltage spikes, and lightning strikes can all cause damage to these circuit boards. It is recommended that a surge protector be installed on the circuit that supplies power to this machine. What Are The Common Problems A Carrier Air Conditioner Encounters?Here are some problems you might encounter with your Carrier AC:
Now, you may wonder, what causes such problems? And how to solve them? Listed are possible causes as to why your AC unit is having that kind of problem and their solutions: The Unit/System Isn't WorkingPossible Causes:
Solutions:
Unit Not Cooling ProperlyPossible Causes:
Solutions:
During An Operation, The Unit Comes To A StopPossible Causes:
Solutions:
How To Troubleshoot An Air Conditioner?When troubleshooting an AC unit, you must check these things first before calling an HVAC technician:
You may ask, what are the things you need to check from the above-mentioned things to help you troubleshoot? And how do you troubleshoot these problems? Here is what you need to know. 1. Thermostat SettingWhen it comes to troubleshooting an air conditioner, the primary control – the thermostat – is frequently the first place to go. Thermostats come in several types, with the most basic types controlling heating and cooling temperatures as well as fan activity. You'll know that your thermostat is damaged when you notice these symptoms:
Before hiring an HVAC technician to repair the problem, check your thermostat if you notice any of the above symptoms in your home.
If the problem is still not solved, contact an HVAC professional for help. 2. Air FilterChecking for a dirty air filter is the next most common step in AC troubleshooting. Your air conditioning system is more than simply the outside unit on the exterior of your house. An indoor air handler device, commonly a furnace or fan coil, is also included in most systems. A clogged filter and obstructed airflow might result from a lack of maintenance. These can result in inefficiency, discomfort, or, in the worst-case scenario, system failure. Make sure the thermostat is set to cool, and the temperature is proper before examining your air filter. 3. Refrigerant LevelContact your trusted HVAC professional if you suspect low refrigerant levels. A skilled HVAC technician will have the tools and know-how to troubleshoot refrigerant-related issues in an air conditioner. Do not attempt to diagnose refrigerant problems on your own. 4. Electrical PanelIf you have a blown fuse or a tripped circuit breaker, be sure you are comfortable and capable of properly replacing the fuse or resetting the breaker - if not, seek expert help. Keep in mind that electricity can be extremely harmful, even fatal. Do not try to troubleshoot electrical problems on your own. 5. Evaporator CoilContinuing to run the system with a frozen evaporator coil can result in catastrophic damage and a possibly expensive repair. When you have a frozen evaporator coil, it is recommended to shut down the system and contact your trusted HVAC professional because the evaporator coil is often not easily accessible. An experienced contractor should do an air conditioner's refrigerant levels troubleshooting. 6. Condenser UnitLike the evaporator coil, a condensing unit could have an overly filthy coil or refrigerant leakage. A defective compressor, a malfunctioning condenser fan motor, or a faulty run capacitor are all possible problems with the outdoor condensing unit. The majority of these air conditioner issues necessitate the assistance of a specialist. Final ThoughtsAlthough there are manuals that come with your air conditioner when you purchase one, it is still best to consult a professional HVAC technician in dealing with error codes. Especially if you are not confident in troubleshooting your air conditioner's issue. Before leaving, you can check these articles: Air Conditioner Turns Off After 30 Seconds – What's Wrong? How To Reset A Carrier Furnace |