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What Do AC Error Codes Mean?
Posted On: June 2, 2024
Air conditioning (AC) units can display error codes when something goes wrong. These codes are specific to the manufacturer and model of the AC unit, but here are some general explanations for common AC error codes:
General AC Error Codes
-
E1/E2/E3/E4: These codes often indicate issues with sensors:
- E1: Room temperature sensor error.
- E2: Indoor coil sensor error.
- E3: Indoor fan speed malfunction.
- E4: Outdoor coil sensor error.
-
F1/F2/F3: These codes are usually related to the frequency drive or the main control board.
- F1: Indoor unit PCB (Printed Circuit Board) error.
- F2: Outdoor unit PCB error.
- F3: Outdoor ambient temperature sensor error.
-
H1/H2/H3: These codes generally indicate protection errors.
- H1: Defrosting mode.
- H2: Overload protection of the compressor.
- H3: High-temperature protection of the compressor.
-
P1/P2/P3: These codes typically relate to pressure or system malfunctions.
- P1: High pressure protection of the system.
- P2: Low pressure protection of the system.
- P3: Protection against lack of refrigerant or malfunction in the refrigerant system.
-
L1/L2/L3: These codes can be related to electrical issues.
- L1: Phase loss or imbalance.
- L2: Overcurrent protection.
- L3: Voltage error or under-voltage protection.
Manufacturer-Specific Error Codes
LG
- CH 01: Indoor unit room temperature sensor error.
- CH 02: Indoor unit pipe temperature sensor error.
- CH 03: Communication error between indoor and outdoor units.
Daikin
- U0: Low refrigerant.
- U4: Transmission error.
- E1: Circuit board malfunction.
Mitsubishi
- P1: Abnormal rise in pressure.
- P8: Outdoor unit air temperature sensor error.
- E0: Inverter/compressor malfunction.
Samsung
- E101: Communication error.
- E121: Indoor temperature sensor error.
- E154: Outdoor coil sensor error.
What to Do When an Error Code Appears
- Consult the Manual: The best source of information is the user manual or service manual for your specific AC model.
- Reset the Unit: Sometimes, resetting the unit by turning it off and on again can clear the error.
- Check for Obvious Issues: Ensure that filters are clean, vents are not blocked, and that there is no visible damage to the unit.
- Call a Professional: If the error persists, it's best to contact a professional technician. They can diagnose and fix the issue safely.
Understanding these codes can help you determine whether the issue is something simple that you can fix yourself or if you need to call a professional for assistance.
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See What Our Customers Are Saying:
Feb 1, 2021
Dave was very pleasant to deal with and Twintech responded quickly when our furnace needed to be replaced ASAP. Installation was done on time and the crew were neat and tidy. We now have a great furnace that suits the needs of our family.
Feb 1, 2021
When your furnace kicks in over the holidays and you're not sure where to turn.. I'm so thankful that this company returned my phone call. I appreciated their transparency and clarity which allowed me to make an informed decision. With various quotes thrown at you, it can be difficult to make the right decision and trust the solutions offered by different companies. TwinTech spoke the truth and delivered on their word. Neat, timely and clean service; the peace of mind I needed during a very cold holiday season. I highly recommend them!
Feb 1, 2021
Pulling a old unit out and installing a modern heating system! Required drilling holes in the wall for the newer pipes. We went from 70% (I am willing to bet it was far less due to lack of maintenance and just old) to 96% newer . It now feels warmer and more pressure and we use to run extra heaters and feel as though they are not necessary!
Feb 1, 2021
I received three quotes before deciding to choose Twintech. Dave's prices was much more reasonable than the competitors. I most appreciated their honest recommendations. Others tried to oversell their products and services. Thank you Dave!
Feb 1, 2021
They had the best price and did a great job on the installation. Recommend them to anyone.
Feb 1, 2021
It was a amazing and professional high quality job
Friendly and very helpful representatives
Thank you for understanding my concern
And explain very well
Overall we pleased with your service
Tanks
May 15, 2020
My 19 year old furnace stopped working when the cold weather hit in November, and I was left without heat. I interviewed several companies and found TWINTECH HEATING and COOLING to be very knowledgeable, quick to respond to my inquiries and very competitively priced.
Dave provided all of the information and pricing ahead of time and set up the appointment for the installation. Greg and Mitch arrived on time to do the installation and worked quickly and efficiently to complete the job.
After the completion of the installation, Dave followed up to ensure that everything was working well and that I didn't have any concerns.
Overall, this was a low-stress and flawless experience from start to finish. I would highly recommend TWINTECH HEATING and COOLING to anyone that requires a new furnace.
May 14, 2020
Our 20 year old furnace broke down during the first cold weekend this past November and our usual HVAC company never returned our phone call. Their loss, missing out on a sale since we didn't want to spend much fixing an old furnace and our 40 year old air conditioner was also long overdue for replacement. We proceeded in obtaining three different quotes for furnace and air conditioner replacement, and proceeded with the one we received from Twintech.
Dave was friendly, knowledgable and accommodating to our schedule and provided with us with a price that fell in the middle of the three quotes that we had. We felt that the Amana furnace and air conditioner he quoted us on were the best products and value offered to us and felt most comfortable with the professionalism and reputation of Twintech.
Greg, Grant and Mitch were at our house for installation the day after we decided to proceed. The guys were friendly and informative, the job was completed efficiently and workmanship appears excellent. Our house is certainly much more comfortable with the new two-stage variable speed Amana furnace compared to the old clunker! And, we're looking forward to enjoying the new air conditioner once summer rolls around again. Thanks Twintech!
May 13, 2020
We are very happy with our new furnace. The service was excellent the guys worked 6 hours straight through and there was no mess at all they took the old furnace boxs etc with them they then explained everything to us they were very helpful and pleasant , when we need a new air conditioner we know who to call!
May 12, 2020
The crew from sales to installation was very professional and had great attention to detail
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