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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:
Jan 1, 2015
Dave was great in helping me get the proper units for my property, as well as getting them installed. The installers arrived when they said they would, and completed the project on time, and professionally. If I needed another furnace, I would use Dave again.
Jan 1, 2015
I have known Greg and Grant Dainty for many years and have used their company for my house and business. I recommended them also for my parents and sister and they all have been very satisfied with the quality of work for a reasonable price. I just recently had them install a new HVAC system in an older house and was very pleased with their work. Craig in Pickering. After meeting with various heating and air conditioning contractors I was referred to Twin Tech Heating and Cooling through a family member. Greg and Grant arrived at my home and provided me with an estimate and a plan as to how they were going to remove and replace my furnace and air conditioner. On the day of install Greg and Grant arrived at my home on time and were very professional and extremely courteous as to any questions or concerns that I had. The removal and install was truly professional and the attention to detail was exactly what I was looking for. Ive seen many installs from other contractors and I couldnt be any happier to have had such a clean looking install. The sheet metal work, ducting and venting all look fantastic. Upon completion Greg and Grant left me feeling extremely happy and very fortunate of a job well done. Thanks again Twin Tech!!
Jan 1, 2015
My old furnace had finally broken down for the last time when contacted twintech to have a new furnace installed They were prompt, knowledgeable and very reasonably priced. They did such a great job i tell all my friends and family about this company.
Jan 1, 2015
To whom it may concern, I recently had TwinTech (Greg and Grant Dainty) replace my furnace and service both my gas fireplaces and air conditioning unit. They were professional, courteous and very fair in their pricing. I would gladly recommend TwinTech to anyone needing work done. I can be contacted at 905-626-XXXX.
Jan 1, 2015
My Fiancé and I have relied on Twintech Heating and Cooling now for the better part of the last 10 years. In that time, Greg has installed a furnace, an air conditioner, and a heat-pump at our residence in Toronto. In each instance Greg and his team were a pleasure to deal with. They were courteous and professional throughout the whole process and the quality of their work is first rate. Our experiences have always been extremely positive and we have referred his services numerous times to our friends and family. Without hesitation, I would recommend Greg and TwinTech Heating and Cooling to anyone looking to service or replace their existing heat/AC equipment
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