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What do These AC Error Codes Mean?

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What do These AC Error Codes Mean?

Posted On: September 7, 2024

What do These AC Error Codes Mean?

If your AC unit is displaying error codes, it's typically signaling an issue with the system that needs attention. The meaning of error codes can vary based on the brand and model of your AC, but here are some common AC error codes and what they usually mean:


1. E1, E2, E3, E4, E5

These codes often indicate sensor problems or communication errors within the system:


  • E1: Communication error between the indoor and outdoor units.
  • E2: Indoor temperature sensor issue.
  • E3: Outdoor temperature sensor problem.
  • E4: Defrost sensor malfunction.
  • E5: Overload protection issue.

2. F0

Usually signals a refrigerant leak or low refrigerant levels.


3. F1

Problem with the evaporator temperature sensor.


4. F2

Issue with the condenser temperature sensor.


5. P1

Voltage fluctuation or abnormal power supply issue.


6. P2

High-temperature protection for the compressor or system is triggered.


7. P4

Indoor temperature sensor problem, similar to the "E2" error.


8. H3

Compressor overload protection error, which could mean the compressor is overheating.


9. L3

This could point to a fan motor issue, particularly in the outdoor unit.


10. DF

Indicates the system is in defrost mode, which is common in heat pump systems during colder weather.


11. CH34

Overheating or high-temperature warning, possibly signaling a serious problem that requires immediate attention.



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Our furnace bit the dust, and Twintech came out to troubleshoot and diagnose the problem within a couple of hours. Mitch was super helpful, patient, and answered all of our questions. When we decided to get the furnace replaced, the crew was over first thing the next morning and did a fantastic job. Not only did they complete the job in a few hours, but they cleaned up and respected our house as they went, and answered all of our follow-up questions. I've used Twintech for our HVAC needs in the past and will continue to do so. I'd recommend them to anyone, and it feels good to support a local, family-owned business.

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Twitch did a great job with the installation of our new furnace. I really appreciated their honesty and I could trust what they were telling me. Another company tried to suggest significantly more work at a greater cost claiming it was necessary to meet current building code. Twintech is very fair. All staff I meet were friendly, polite and trustworthy. I would recommend Twitch for a furnace.

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This is a professional team that's easy to deal with. I would strongly recommend them

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Very professional firm from start to finish!
They removed the old oil tank and furnace. They installed air conditioning and a new propane furnace.
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Upon a routine yearly maintenance, it was discovered there was a leak in the heat exchanger and a I needed a new furnace. I know nothing about these things and was completely stressed out. The company I had the maintenance plan with quoted me a huge number to rent a furnace, I just wanted to cry. Then I spoke to Dave at Twintech. He was so knowledgeable and calming, provided me a fair quote and within a few days I had an amazing crew show up to my house and install my new energy efficient furnace! I have already recommended these wonderful people at Twintech to a good friend of mine. Thank you Twintech!!

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Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

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TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

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Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!

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Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.

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