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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:
Jul 3, 2022
Great service and great people to deal with, from sales to installer. I highly recommend this company.
Apr 28, 2022
Twintech replaced our aging furnace and air conditioner recently. I highly recommend this company. Their quote was competitive, they were on time and respectful of our home and extremely professional. From the salesman to the installers and the owner who followed up afterward to ensure we were satisfied, we are very pleased with the service. We are looking forward to working with this company for all of our HVAC needs for the years to come. Excellent workmanship and service!
Apr 28, 2022
We wanted to get our AC replaced as it was 22-years old and added to this our furnace was costing more and more to repair. So, we decided to get both the furnace and AC replaced.
After going through a few quotes and product reviews we decided to go with Twintech. The three-men crew arrived early in the morning, wasted no time and got to work right away. By 2:00 pm, they were all done. Ive found their work to be top notch and they were completely professional. I had all my questions answered to my satisfaction both during the progress of their work and at end.
I have pleasure in recommending Twintech to anyone who is looking to get their furnace or Ac replaced
Nathan S.
Apr 28, 2022
Our air conditioner died On a Saturday and within hours Dave came out to take a look and discuss replacement/repair options.
The new air conditioner was installed on the Wednesday. The new unit was installed quickly. The installers were friendly and cleaned up afterwards.
We noticed a slight leak around the furnace that night and they came out the next day and fixed the issue. It has been working great and is quieter than our previous unit.
Very satisfied and would highly recommend TwinTech.
Apr 28, 2022
I contacted TwinTech to replace my 20-year old A/C. Dave, their service rep, promptly replied and was at my home within 2 hours. He was friendly and knowledgeable and didn't try to upgrade or oversell their A/C units but suggested the best fit for my small 1000 feet bungalow. Although this was during a heatwave and very busy, they were able to fit me in 2 days later. The TwinTech crew installed a 1.5 ton Ducane A/C unit that is now running smoothly while maintaining a constant cooling temperature. The crew were very courteous, professional and efficient and I will definitely recommend TwinTech to family and friends. I much appreciated your great service.
Nancy M., Oshawa
Apr 28, 2022
We had a great experience. The guys who installed our a/c did a nice job. Cleaned up.
Apr 28, 2022
excellent crew, fast and efficient! Would call them again when I need a new furnace.
Apr 28, 2022
Professional, courteous and efficient, dont need to say more than that! Use them you will not regret it.
Apr 28, 2022
TwinTech was a pleasure to deal with from the estimate through installation. We replaced a 28 year old a/c unit with one recommended by TwinTech's sales representative Dave who took the time to go over the product with us and answer any questions. The warranty is for 10 years parts and labour and they will complete the registration for you. Installation was by Greg (owner) and Mitch and Spencer who were quick and efficient and left everything clean and tidy.
Apr 28, 2022
Very professional, from the sales consultation and inspection to the final installation. Met every expectations we had for the job. A local business with great client support. We highly recommend. Twintech is a blue chip! Thanks!
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