Durham Region Air Conditioning Repair, Service and Installation
Error Codes. By checking the error code, you are able to identify the status and the issue of the air conditioner/air conditioning system.
CODE: E0.
RESULT: Indoor EEPROM (Electrically Erasable Programmable Read-Only Memory) error.
RESULT: Indoor EEPROM (Electrically Erasable Programmable Read-Only Memory) error.
CODE: E1.
RESULT: Indoor and outdoor unit communication malfunction.
RESULT: Indoor and outdoor unit communication malfunction.
CODE: E3.
RESULT: Indoor fan speed malfunction.
RESULT: Indoor fan speed malfunction.
CODE: E4.
RESULT: Indoor room temperature sensor error.
RESULT: Indoor room temperature sensor error.
CODE: E5.
RESULT: Evaporator coil temperature sensor error.
RESULT: Evaporator coil temperature sensor error.
CODE: EC.
RESULT: Refrigerant leak detection system malfunction.
RESULT: Refrigerant leak detection system malfunction.
CODE: EE.
RESULT: Water level alarm malfunction.
RESULT: Water level alarm malfunction.
CODE: E8.
RESULT: Dual indoor unit (twin model only) communication malfunction.
RESULT: Dual indoor unit (twin model only) communication malfunction.
CODE: E9.
RESULT: Other twin model malfunction.
RESULT: Other twin model malfunction.
CODE: F0.
RESULT: Overload protection.
RESULT: Overload protection.
CODE: F1.
RESULT: Outdoor temperature sensor error.
RESULT: Outdoor temperature sensor error.
CODE: F2.
RESULT: Outdoor condenser pipe sensor error.
RESULT: Outdoor condenser pipe sensor error.
CODE: F3.
RESULT: Discharge air temperature sensor error.
RESULT: Discharge air temperature sensor error.
CODE: F4.
RESULT: Outdoor EEPROM (Electrically Erasable Programmable Read-Only Memory) error.
RESULT: Outdoor EEPROM (Electrically Erasable Programmable Read-Only Memory) error.
CODE: F5.
RESULT: Outdoor fan speed (DC fan motor only) malfunction.
RESULT: Outdoor fan speed (DC fan motor only) malfunction.
CODE: F6.
RESULT: T2b sensor error.
RESULT: T2b sensor error.
CODE: F7.
RESULT: Auto-lifting panel communication error.
RESULT: Auto-lifting panel communication error.
CODE: F8.
RESULT: Auto-lifting panel malfunction.
RESULT: Auto-lifting panel malfunction.
CODE: F9.
RESULT: Auto-lifting panel is open.
RESULT: Auto-lifting panel is open.
CODE: P0.
RESULT: Inverter module IPM protection.
RESULT: Inverter module IPM protection.
CODE: P1.
RESULT: High/Low voltage protection.
RESULT: High/Low voltage protection.
CODE: P2.
RESULT: Compressor top overheating protection.
RESULT: Compressor top overheating protection.
CODE: P3.
RESULT: Outdoor low temperature protection.
RESULT: Outdoor low temperature protection.
CODE: P4.
RESULT: Compressor drive error.
RESULT: Compressor drive error.
CODE: P5.
RESULT: Mode conflict.
RESULT: Mode conflict.
CODE: P6.
RESULT: Compressor low-pressure protection.
RESULT: Compressor low-pressure protection.
CODE: P7.
RESULT: Outdoor IGBT sensor error.
RESULT: Outdoor IGBT sensor error.
York Central Controller Fault Codes.
CODE: H3.
RESULT: Outdoor adding malfunction (valid for host unit).
RESULT: Outdoor adding malfunction (valid for host unit).
CODE: H2.
RESULT: Outdoor decreasing malfunction (valid for host unit).
RESULT: Outdoor decreasing malfunction (valid for host unit).
CODE: H1.
RESULT: Net communication malfunction.
RESULT: Net communication malfunction.
CODE: EF.
RESULT: Other malfunction.
RESULT: Other malfunction.
CODE: E4-T4.
RESULT: Temp. Sensor malfunction.
RESULT: Temp. Sensor malfunction.
CODE: E3-T3.
RESULT: Temp. Sensor malfunction.
RESULT: Temp. Sensor malfunction.
CODE: E2.
RESULT: Sensor malfunction.
RESULT: Sensor malfunction.
CODE: E1-E0.
RESULT: Communication malfunction Phase sequence or lack of phase.
RESULT: Communication malfunction Phase sequence or lack of phase.
CODE: PF.
RESULT: Other Protection.
RESULT: Other Protection.
CODE: PE.
RESULT: Oil Balance.
RESULT: Oil Balance.
CODE: PD.
RESULT: Oil Return.
RESULT: Oil Return.
CODE: PA.
RESULT: Defrost Protection.
RESULT: Defrost Protection.
CODE: P8.
RESULT: Compressor Current 3rd Protection.
RESULT: Compressor Current 3rd Protection.
CODE: P7.
RESULT: Compressor Current 2nd Protection.
RESULT: Compressor Current 2nd Protection.
CODE: P5.
RESULT: Condenser High Temp. Protection.
RESULT: Condenser High Temp. Protection.
CODE: P4.
RESULT: Discharge Pipe Temp. Protection.
RESULT: Discharge Pipe Temp. Protection.
CODE: P3.
RESULT: Compressor Current 1st Protection.
RESULT: Compressor Current 1st Protection.
CODE: P2.
RESULT: Discharge Low- pressure Protection.
RESULT: Discharge Low- pressure Protection.
CODE: P1-P0.
RESULT: Discharge High- pressure Protection Compressor High Temp. Protection.
RESULT: Discharge High- pressure Protection Compressor High Temp. Protection.
Malfunction Code of Outdoor unit.
CODE: E1.
RESULT: Phase sequence error.
RESULT: Phase sequence error.
CODE: E2.
RESULT: Communication malfunction between indoor/outdoor units.
RESULT: Communication malfunction between indoor/outdoor units.
CODE: E3.
RESULT: T3 temperature sensor malfunction.
RESULT: T3 temperature sensor malfunction.
CODE: E4.
RESULT: T4 temperature sensor malfunction.
RESULT: T4 temperature sensor malfunction.
CODE: E5.
RESULT: T5 temperature sensor malfunction.
RESULT: T5 temperature sensor malfunction.
CODE: E6.
RESULT: Water-level alarm malfunction.
RESULT: Water-level alarm malfunction.
York Central Air Conditioning Error Codes,
CODE: EF.
RESULT: Other malfunction PF Other Protection.
RESULT: Other malfunction PF Other Protection.
CODE: EE.
RESULT: Water level checking malfunction PE Reserve.
RESULT: Water level checking malfunction PE Reserve.
CODE: ED.
RESULT: Outdoor protection PD Reserve.
RESULT: Outdoor protection PD Reserve.
CODE: EC.
RESULT: Clear malfunction PC Reserve.
RESULT: Clear malfunction PC Reserve.
CODE: EB.
RESULT: Inverter Module Protection PB Reserve.
RESULT: Inverter Module Protection PB Reserve.
CODE: EA.
RESULT: Compressor Over-current (4 times) PA Reserve.
RESULT: Compressor Over-current (4 times) PA Reserve.
CODE: E9.
RESULT: Communication malfunction between PCB and Display board P9 Reserve.
RESULT: Communication malfunction between PCB and Display board P9 Reserve.
CODE: E8.
RESULT: Fan motor checking out of control P8 Compressor Over-current.
RESULT: Fan motor checking out of control P8 Compressor Over-current.
CODE: E7.
RESULT: EEPROM malfunction P7 Power Lack/Over Volt Protection.
RESULT: EEPROM malfunction P7 Power Lack/Over Volt Protection.
CODE: E6.
RESULT: Over-zero checking malfunction P6 Discharge Low-pressure Protection.
RESULT: Over-zero checking malfunction P6 Discharge Low-pressure Protection.
CODE: E5.
RESULT: T3 sensor malfunction P5 Discharge High-pressure Protection.
RESULT: T3 sensor malfunction P5 Discharge High-pressure Protection.
CODE: E4.
RESULT: T2B sensor malfunction P4 Discharge Pipe Temp. Protection.
RESULT: T2B sensor malfunction P4 Discharge Pipe Temp. Protection.
CODE: E3.
RESULT: T2A sensor malfunction P3 Compressor Temp. Protection.
RESULT: T2A sensor malfunction P3 Compressor Temp. Protection.
CODE: E2.
RESULT: T1 sensor malfunction P2 Condenser High Temp. Protection.
RESULT: T1 sensor malfunction P2 Condenser High Temp. Protection.
CODE: E1.
RESULT: Communication malfunction P1 Anti-cooling or Defrost Protection.
RESULT: Communication malfunction P1 Anti-cooling or Defrost Protection.
CODE: E0.
RESULT: Phase sequence or lack of phase P0 Evaporator Temp. Protection.
RESULT: Phase sequence or lack of phase P0 Evaporator Temp. Protection.
CODE: 03#.
RESULT: CCM/PC(gateway) Communication Malfunction.
RESULT: CCM/PC(gateway) Communication Malfunction.
CODE: 02#.
RESULT: CCM/Function Module Communication Malfunction.
RESULT: CCM/Function Module Communication Malfunction.
CODE: 01#.
RESULT: CCM/NIM Communication Malfunction.
RESULT: CCM/NIM Communication Malfunction.
CODE: 00#.
RESULT: CCM/PCB Communication Malfunction.
RESULT: CCM/PCB Communication Malfunction.
York Wall Mounted Type Ac Error Codes.
CODE: E7.
RESULT: Communication fault between indoor and outdoor units.
RESULT: Communication fault between indoor and outdoor units.
CODE: E1.
RESULT: Room temperature sensor failure.
RESULT: Room temperature sensor failure.
CODE: E4.
RESULT: Indoor EEPROM error.
RESULT: Indoor EEPROM error.
CODE: E14.
RESULT: Indoor fan motor malfunction.
RESULT: Indoor fan motor malfunction.
CODE: F12.
RESULT: Outdoor EEPROM error.
RESULT: Outdoor EEPROM error.
CODE: F1.
RESULT: The protection of IPM.
RESULT: The protection of IPM.
CODE: F22.
RESULT: Overcurrent protection of AC electricity for the outdoor model.
RESULT: Overcurrent protection of AC electricity for the outdoor model.
CODE: F3.
RESULT: Communication fault between the IPM and outdoor PCB.
RESULT: Communication fault between the IPM and outdoor PCB.
CODE: F19.
RESULT: Power voltage is too high or low.
RESULT: Power voltage is too high or low.
CODE: F4.
RESULT: Overheat protection for Discharge temperature.
RESULT: Overheat protection for Discharge temperature.
CODE: F8.
RESULT: Outdoor DC fan motor fault.
RESULT: Outdoor DC fan motor fault.
CODE: F21.
RESULT: Defrost temperature sensor failure.
RESULT: Defrost temperature sensor failure.
CODE: F7.
RESULT: Suction temperature sensor failure.
RESULT: Suction temperature sensor failure.
CODE: F6.
RESULT: Ambient temperature sensor failure.
RESULT: Ambient temperature sensor failure.
CODE: F25.
RESULT: Discharge temperature sensor failure.
RESULT: Discharge temperature sensor failure.
CODE: F11.
RESULT: deviate from the normal for the compressor.
RESULT: deviate from the normal for the compressor.
CODE: F28.
RESULT: Loop of the station detect error.
RESULT: Loop of the station detect error.
CODE: F2.
RESULT: Overcurrent of the compressor.
RESULT: Overcurrent of the compressor.
CODE: F23.
RESULT: Overcurrent protection for single-phase of the compressor.
RESULT: Overcurrent protection for single-phase of the compressor.
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!
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