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Most Common AC Error Codes
Posted On: July 4, 2024
Air conditioners (AC) come with built-in error codes that help diagnose issues. Here's a list of some of the most common AC error codes and their meanings:
General AC Error Codes
- E1: Indoor unit temperature sensor error
- E2: Indoor unit coil temperature sensor error
- E3: Outdoor unit temperature sensor error
- E4: Outdoor unit coil temperature sensor error
- E5: Communication error between indoor and outdoor units
- E6: Compressor temperature sensor error
- E7: Outdoor fan motor error
- E8: Indoor fan motor error
- E9: Water-level alarm (for units with dehumidifiers)
- F0: Overload protection of compressor
Troubleshooting Tips
- Check the Manual: Always refer to the user manual for specific error codes related to your AC model.
- Reset the Unit: Sometimes a simple reset can clear minor glitches. Turn off the unit, wait for a few minutes, and turn it back on.
- Inspect Filters and Vents: Clogged filters and obstructed vents can cause various errors.
- Ensure Proper Power Supply: Verify that the AC unit is receiving the correct voltage and power.
- Call a Professional: For complex issues, it’s best to consult a certified technician.
Understanding these error codes can help you quickly diagnose and, in some cases, resolve issues with your AC unit.
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See What Our Customers Are Saying:
Apr 12, 2019
On one of the coldest days of winter, our furnace stopped working. Our regular furnace company came and told us we had a CO2 leak and shut us off. Their quote for a new furnace was way too high and they couldn't even install it on the same day. TwinTech was recommended to us by a friend. We called and spoke to Dave who was very nice and knowledgeable. Grant showed up a short time later and a new furnace was installed the same day with no troubles at all. Best of all, we received a higher-end furnace than what was offered by our previous company and at a cheaper price. I would recommend TwinTech with no hesitation at all.
Apr 11, 2019
I installed a new furnace and Air conditioner with them. The installation is of high quality and according to standards. The guys are professional and reasonably priced.. I highly recommend them.
Apr 10, 2019
Had new furnace installed and ran into some difficulties but the contractor responded in a timely and efficient manner - after further service calls were made, a reasonable resolution was found.
Apr 8, 2019
The work was done quickly efficiently neatly and professionally. Pleased with the service, information, product, and the company.
Apr 1, 2019
Great sales member named Dave came in told us some amazing items and how they would be priced installed an all. We couldnt believe it! The next day the ac was installed, that day one employee named Greg told us that our furnace was working way to hard and was causing us to use way too much gas. So two days later they came in an installed a new furnace!
Apr 1, 2019
Installation was done quickly and professionally. The new furnace is quiet and provides even heat.
Mar 3, 2019
They removed and discarded old furnace. Installed new furnace. Installed air intake pipe, that had never been installed by builder, no charge. Replaced loose hose on floor with hard pipe and rerouted it to drain, no charge. Almost 33% cheaper then quote from Enercare, which was the company we dealt with and had insurance with for 8 years. No yearly fee for cleaning/insurance, saves 300 a year. Courteous, professional, fast, and friendly. My wife and I have been recommending them to everyone we know and meet, and will continue to do so. Thanks for everything, Twintech!!!
Mar 4, 2019
This company was great to deal with. Our furnace went down and they installed a new furnace the next day with a lot of professionalism!
Feb 22, 2019
Finally! An honest company with highly knowledgeable and informative staff. Had a furnace service and found multiply errors in our system from an amateur installer. Very fair price to correct problems and will definitely use again.
Feb 16, 2019
Had to replace the heating & a/c unit in a condo apartment dwelling. this company recommended by the property manager and president of the condo building. found their workmanship and attention to details very good and very thorough. were able to resolve small problems and situations and happy to feel the heat in my unit. it's pricey, but happy was done by a very professional service. thank you.
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