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 16, 2022
Very pleased with the installation of our new furnace and A/C unit. From quotation stage to the completion of the job Twintech was very professional.
Thank you for a job well done.
Aug 15, 2022
My old water heater quit on me. I called TwinTech. In less than 4 days, I had my new water heater installed and the old one taken away. The whole process was quick, easy, pleasant, and well done. This is the third time I've dealt with TwinTech and I've been satisfied each time.
Aug 14, 2022
I had them replace my furnace last year. When it came time for the air conditioner this year, I did not hesitate to call Twintech again. I will also have them perform regular maintenance on them.
Aug 13, 2022
We required a new HVAC replacement after running the old
system for 18 years.
Dave understood our requirements and gave us a quote that
covered all the necessary items.
Installation was fast and very tidy. Everything works as
it should. Our thanks to Greg, Mitch and others for their
excellent work. Recommend this family owned business to
anyone else, considering HVAC or other work.
Aug 12, 2022
I needed a new furnace and A/C to replace my 21 yr. old units, and went to the internet to view potential companies in May, I received 3 quotes,
and chose Twintech based on their salesman Dave who was very detailed and covered off everything on what Twintech was all about,
an extremely dedicated company with so many years of experience, and after reading the on line reviews I was sold on Twintech, who did not disappoint as the installation team were top notch with Greg leading,
I would highly recommend this company without any doubts, in my books they are first class all the way. Our new Amana furnace and A/C are working perfectly !
Aug 11, 2022
Flawless transaction. They did exactly what they promised, showed-up on time, cleaned-up, and were highly professional. Highly recommended.
Aug 10, 2022
Salesperson and 2 man installation team were all professional and
knew their stuff. All three were friendly and helpful, answering all
my questions. The quality of their work demonstrated their experience
and expertise in their field.
Aug 9, 2022
A dear late cousin of mine recommended this company and I have been happy with the service.
Aug 8, 2022
We are very pleased with the work done by Twintech. They were very professional from start to finish. Dave came to our home and gave us a very competitive quote for new high efficiency furnace and air conditioner. The installers were very courteous and professional. We would highly recommend them.
Aug 7, 2022
Great experience getting an old furnace replaced.
Sales Guy (Dave) was great - honest, responsive, and friendly.
The work itself was done quickly and we are very happy with the outcome, thank you! We recommend TwinTech!
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!
Pickering Furnace Leaking
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - January 19, 2025
If you’re dealing with a furnace leaking water in Pickering, you’re not alone. This common issue can lead to water damage and disrupt your heating system’s efficiency. At Twintech Heating and Cooling, we understand how crucial a pro
Read MoreAdvanced Furnace Features You May Not Know
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - December 12, 2024
1. Variable-Speed Blowers Modern furnaces often come equipped with variable-speed blowers that adjust the airflow based on your home’s heating needs. This results in: Improved Energy Efficiency: Less energy wasted during operation. E
Read MoreMy AC is Not Blowing Cold Air
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - May 7, 2024
There could be several reasons why your air conditioner isn't blowing cold air. Here are a few common issues and troubleshooting steps: Thermostat Settings: Make sure your thermostat is set to "cool" mode and the temperature is
Read MoreHow to Choose the Best Cold-Climate Heat Pump for Your Home
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - November 30, 2025
Choosing a cold-climate heat pump is one of the smartest upgrades you can make for your Ontario home. These modern systems are engineered to deliver strong, efficient heating even in freezing temperatures — making them ideal for our long, sn
Read More