Durham Region Air Conditioning Repair, Service and Installation
The tables below contain lists of error codes for several models of the Midea air conditioners. For each error code, there is a short explanation of the type of the malfunction. There are separate tables for the following series of Midea ACs: R series, 9V, 9A, and the Cassette / Ceiling&Floor series. If you're looking for information on AC Outdoor Units, you will also nd it below.
Midea air conditioner error code R series
CODE: E0.
RESULT: EEPROM parameter error.
RESULT: EEPROM parameter error.
CODE: E1.
RESULT: Indoor / outdoor units communication protection.
RESULT: Indoor / outdoor units communication protection.
CODE: E2.
RESULT: Zero-crossing signal error.
RESULT: Zero-crossing signal error.
CODE: E3.
RESULT: Fan speed out of control.
RESULT: Fan speed out of control.
CODE: E5.
RESULT: Open or short circuit of outdoor temperature sensor.
RESULT: Open or short circuit of outdoor temperature sensor.
CODE: E6.
RESULT: Open or short circuit of room or evaporator temperature sensor.
RESULT: Open or short circuit of room or evaporator temperature sensor.
CODE: P0.
RESULT: IGBT over-strong current protection.
RESULT: IGBT over-strong current protection.
CODE: P1.
RESULT: Over voltage or too under voltage protection.
RESULT: Over voltage or too under voltage protection.
CODE: P2.
RESULT: Temperature protection of compressor top.
RESULT: Temperature protection of compressor top.
CODE: P4.
RESULT: Inverter compressor drive error.
RESULT: Inverter compressor drive error.
Midea air conditioner error code 9V series
CODE: E0.
RESULT: EEPROM.
RESULT: EEPROM.
CODE: E1.
RESULT: Indoor / outdoor units communication protection.
RESULT: Indoor / outdoor units communication protection.
CODE: E2.
RESULT: 3 Zero-crossing signal error.
RESULT: 3 Zero-crossing signal error.
CODE: E3.
RESULT: Indoor fan speed out of control.
RESULT: Indoor fan speed out of control.
CODE: E5.
RESULT: Outdoor unit temp. sensor or connector of temp. sensor is defective.
RESULT: Outdoor unit temp. sensor or connector of temp. sensor is defective.
CODE: E6.
RESULT: Open or short circuit of room or evaporator temperature.
RESULT: Open or short circuit of room or evaporator temperature.
CODE: E7.
RESULT: Outdoor fan speed out of control.
RESULT: Outdoor fan speed out of control.
CODE: P0.
RESULT: IBM malfunction or IGBT over-strong current protection.
RESULT: IBM malfunction or IGBT over-strong current protection.
CODE: P1.
RESULT: Over voltage or too under voltage protection.
RESULT: Over voltage or too under voltage protection.
CODE: P2.
RESULT: Temperature protection of compressor top.
RESULT: Temperature protection of compressor top.
CODE: P4.
RESULT: Compressor position protection.
RESULT: Compressor position protection.
CODE: P5.
RESULT: Inverter module protection.
RESULT: Inverter module protection.
Midea air conditioner error code 9A series
CODE: E0.
RESULT: EEPROM.
RESULT: EEPROM.
CODE: E1.
RESULT: Indoor / outdoor units communication protection.
RESULT: Indoor / outdoor units communication protection.
CODE: E2.
RESULT: Zero-crossing signal error.
RESULT: Zero-crossing signal error.
CODE: E3.
RESULT: Indoor fan speed out of control.
RESULT: Indoor fan speed out of control.
CODE: E5.
RESULT: Outdoor unit temp. sensor or connector of temp. sensor is defective.
RESULT: Outdoor unit temp. sensor or connector of temp. sensor is defective.
CODE: E6.
RESULT: Open or short circuit of room or evaporator temperature.
RESULT: Open or short circuit of room or evaporator temperature.
CODE: E7.
RESULT: Outdoor fan speed out of control.
RESULT: Outdoor fan speed out of control.
CODE: P0.
RESULT: IBM malfunction or IGBT over-strong current protection.
RESULT: IBM malfunction or IGBT over-strong current protection.
CODE: P1.
RESULT: Over voltage or too under voltage protection.
RESULT: Over voltage or too under voltage protection.
CODE: P2.
RESULT: Temperature protection of compressor top.
RESULT: Temperature protection of compressor top.
CODE: P4.
RESULT: Compressor position protection.
RESULT: Compressor position protection.
CODE: P5.
RESULT: Inverter module protection.
RESULT: Inverter module protection.
Midea AC Outdoor Units error code (except M5OA-36HRDN1-Q model)
CODE: E0.
RESULT: EEPROM error.
RESULT: EEPROM error.
CODE: E1.
RESULT: No A Indoor unit coil outlet temp. sensor or connector of sensor is defective.
RESULT: No A Indoor unit coil outlet temp. sensor or connector of sensor is defective.
CODE: E2.
RESULT: No B Indoor unit coil outlet temp. sensor or connector of sensor is defective.
RESULT: No B Indoor unit coil outlet temp. sensor or connector of sensor is defective.
CODE: E3.
RESULT: No C Indoor unit coil outlet temp. sensor or connector of sensor is defective.
RESULT: No C Indoor unit coil outlet temp. sensor or connector of sensor is defective.
CODE: E6.
RESULT: No D Indoor unit coil outlet temp. sensor or connector of sensor is defective.
RESULT: No D Indoor unit coil outlet temp. sensor or connector of sensor is defective.
CODE: E4.
RESULT: Outdoor unit temp. sensor or connector of temp. sensor is defective.
RESULT: Outdoor unit temp. sensor or connector of temp. sensor is defective.
CODE: E5.
RESULT: Compressor voltage protection.
RESULT: Compressor voltage protection.
CODE: E7.
RESULT: Communication malfunction between outdoor main chip and compressor control chip.
RESULT: Communication malfunction between outdoor main chip and compressor control chip.
CODE: P0.
RESULT: Temperature protection of compressor discharge or compressor top. For M4OC-36HRDN1-Q,it only means compressor discharge temp.protection.
RESULT: Temperature protection of compressor discharge or compressor top. For M4OC-36HRDN1-Q,it only means compressor discharge temp.protection.
CODE: P1.
RESULT: High pressure protection(only for M4OC1-27HRDN1-Q, M4OC-36HRDN1-Q).
RESULT: High pressure protection(only for M4OC1-27HRDN1-Q, M4OC-36HRDN1-Q).
CODE: P2.
RESULT: Low pressure protection(only for M4OC1-27HRDN1-Q, M4OC-36HRDN1-Q).
RESULT: Low pressure protection(only for M4OC1-27HRDN1-Q, M4OC-36HRDN1-Q).
CODE: P3.
RESULT: Compressor current protection.
RESULT: Compressor current protection.
CODE: P4.
RESULT: Inverter module protection.
RESULT: Inverter module protection.
CODE: P6.
RESULT: Condenser high-temperature protection.
RESULT: Condenser high-temperature protection.
Midea AC Outdoor Units error code For M5OA-36HRDN1-Q model
CODE: E0.
RESULT: EEPROM error.
RESULT: EEPROM error.
CODE: E1.
RESULT: No A Indoor unit coil outlet temp. sensor or connector of sensor is defective.
RESULT: No A Indoor unit coil outlet temp. sensor or connector of sensor is defective.
CODE: E2.
RESULT: Communication malfunction between outdoor unit and indoor units.
RESULT: Communication malfunction between outdoor unit and indoor units.
CODE: E3.
RESULT: Communication malfunction between outdoor main chip and compressor control chip.
RESULT: Communication malfunction between outdoor main chip and compressor control chip.
CODE: E4.
RESULT: Outdoor unit temp. sensor or connector of temp. sensor is defective.
RESULT: Outdoor unit temp. sensor or connector of temp. sensor is defective.
CODE: E5.
RESULT: Compressor voltage protection.
RESULT: Compressor voltage protection.
CODE: E6.
RESULT: PFC module protection.
RESULT: PFC module protection.
CODE: P0.
RESULT: Compressor top. temperature protection.
RESULT: Compressor top. temperature protection.
CODE: P1.
RESULT: High pressure protection.
RESULT: High pressure protection.
CODE: P2.
RESULT: Low pressure protection.
RESULT: Low pressure protection.
CODE: P3.
RESULT: Compressor current protection.
RESULT: Compressor current protection.
CODE: P4.
RESULT: Compressor discharge high-temperature protection.
RESULT: Compressor discharge high-temperature protection.
CODE: P5.
RESULT: Condenser high-temperature protection.
RESULT: Condenser high-temperature protection.
CODE: P6.
RESULT: Inverter module protection.
RESULT: Inverter module protection.
CODE: F1.
RESULT: No A Indoor unit coil outlet temp. sensor or connector of sensor is defective Midea air conditioner error codes.
RESULT: No A Indoor unit coil outlet temp. sensor or connector of sensor is defective Midea air conditioner error codes.
CODE: F2.
RESULT: No B Indoor unit coil outlet temp. sensor or connector of sensor is defective.
RESULT: No B Indoor unit coil outlet temp. sensor or connector of sensor is defective.
CODE: F3.
RESULT: No C Indoor unit coil outlet temp. sensor or connector of sensor is defective.
RESULT: No C Indoor unit coil outlet temp. sensor or connector of sensor is defective.
CODE: F4.
RESULT: No D Indoor unit coil outlet temp. sensor or connector of sensor is defective.
RESULT: No D Indoor unit coil outlet temp. sensor or connector of sensor is defective.
CODE: F5.
RESULT: No E Indoor unit coil outlet temp. sensor or connector of sensor is defective.
RESULT: No E Indoor unit coil outlet temp. sensor or connector of sensor is defective.
Midea M2OC-18HRDN1-M air conditioner error code
CODE: EO.
RESULT: EEPROM parameter error.
RESULT: EEPROM parameter error.
CODE: E1.
RESULT: No 1 Indoor units pipe temp, sensor or connector of pipe temp, sensor is defective.
RESULT: No 1 Indoor units pipe temp, sensor or connector of pipe temp, sensor is defective.
CODE: E2.
RESULT: No 2 Indoor units pipe temp, sensor or connector of pipe temp, sensor is defective.
RESULT: No 2 Indoor units pipe temp, sensor or connector of pipe temp, sensor is defective.
CODE: E3.
RESULT: No 3 Indoor units pipe temp, sensor or connector of pipe temp, sensor is defective.
RESULT: No 3 Indoor units pipe temp, sensor or connector of pipe temp, sensor is defective.
CODE: E6.
RESULT: No 4 Indoor units pipe temp, sensor or connector of pipe temp, sensor is defective.
RESULT: No 4 Indoor units pipe temp, sensor or connector of pipe temp, sensor is defective.
CODE: E4.
RESULT: Open or short circuit of outdoor temperature sensor.
RESULT: Open or short circuit of outdoor temperature sensor.
CODE: E5.
RESULT: Compressor volt protection.
RESULT: Compressor volt protection.
CODE: E7.
RESULT: Communication error between outdoor IC and DSP.
RESULT: Communication error between outdoor IC and DSP.
CODE: PO.
RESULT: Temperature protection of compressor top.
RESULT: Temperature protection of compressor top.
CODE: P1.
RESULT: High pressure protection (just for 36K 1x4 units).
RESULT: High pressure protection (just for 36K 1x4 units).
CODE: P2.
RESULT: Low pressure protection (just for 36K 1x4 units).
RESULT: Low pressure protection (just for 36K 1x4 units).
CODE: P3.
RESULT: Compressor current protection.
RESULT: Compressor current protection.
CODE: P4.
RESULT: Inverter module protection.
RESULT: Inverter module protection.
CODE: P5.
RESULT: Outdoor temp, too low protection.
RESULT: Outdoor temp, too low protection.
CODE: P6.
RESULT: Condenser high-temperature protection.
RESULT: Condenser high-temperature protection.
CODE: P7.
RESULT: Compressor driving protection.
RESULT: Compressor driving protection.
CODE: PF.
RESULT: PFC protection (just for 36K 1x4 units).
RESULT: PFC protection (just for 36K 1x4 units).
Midea MSX-07HRN1-QC2 air conditioner error code
CODE: E1.
RESULT: EEPROM error.
RESULT: EEPROM error.
CODE: E2.
RESULT: Zero crossing detection error.
RESULT: Zero crossing detection error.
CODE: E3.
RESULT: Indoor fan speed has been out of control.
RESULT: Indoor fan speed has been out of control.
CODE: E4.
RESULT: Over current protection occurs 4 times.
RESULT: Over current protection occurs 4 times.
CODE: E5.
RESULT: The T1 sensor is open circuit or short circuit.
RESULT: The T1 sensor is open circuit or short circuit.
CODE: E6.
RESULT: The T2 sensor is open circuit or short circuit.
RESULT: The T2 sensor is open circuit or short circuit.
CODE: E7.
RESULT: The T3 sensor is open circuit or short circuit.
RESULT: The T3 sensor is open circuit or short circuit.
CODE: E9.
RESULT: Indoor / outdoor units communication error.
RESULT: Indoor / outdoor units communication error.
See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
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.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
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!
Feb 18, 2025
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!
Feb 18, 2025
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.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
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.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
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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