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 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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