$49 / month O.A.C Including Install
$49 / month O.A.C Including Install

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Durham Region Air Conditioning Repair, Service and Installation

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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.

CODE: E1.
RESULT: Indoor and outdoor unit communication malfunction.

CODE: E3.
RESULT: Indoor fan speed malfunction.

CODE: E4.
RESULT: Indoor room temperature sensor error.

CODE: E5.
RESULT: Evaporator coil temperature sensor error.

CODE: EC.
RESULT: Refrigerant leak detection system malfunction.

CODE: EE.
RESULT: Water level alarm malfunction.

CODE: E8.
RESULT: Dual indoor unit (twin model only) communication malfunction.

CODE: E9.
RESULT: Other twin model malfunction.

CODE: F0.
RESULT: Overload protection.

CODE: F1.
RESULT: Outdoor temperature sensor error.

CODE: F2.
RESULT: Outdoor condenser pipe sensor error.

CODE: F3.
RESULT: Discharge air temperature sensor error.

CODE: F4.
RESULT: Outdoor EEPROM (Electrically Erasable Programmable Read-Only Memory) error.

CODE: F5.
RESULT: Outdoor fan speed (DC fan motor only) malfunction.

CODE: F6.
RESULT: T2b sensor error.

CODE: F7.
RESULT: Auto-lifting panel communication error.

CODE: F8.
RESULT: Auto-lifting panel malfunction.

CODE: F9.
RESULT: Auto-lifting panel is open.

CODE: P0.
RESULT: Inverter module IPM protection.

CODE: P1.
RESULT: High/Low voltage protection.

CODE: P2.
RESULT: Compressor top overheating protection.

CODE: P3.
RESULT: Outdoor low temperature protection.

CODE: P4.
RESULT: Compressor drive error.

CODE: P5.
RESULT: Mode conflict.

CODE: P6.
RESULT: Compressor low-pressure protection.

CODE: P7.
RESULT: Outdoor IGBT sensor error.

York Central Controller Fault Codes.

CODE: H3.
RESULT: Outdoor adding malfunction (valid for host unit).

CODE: H2.
RESULT: Outdoor decreasing malfunction (valid for host unit).

CODE: H1.
RESULT: Net communication malfunction.

CODE: EF.
RESULT: Other malfunction.

CODE: E4-T4.
RESULT: Temp. Sensor malfunction.

CODE: E3-T3.
RESULT: Temp. Sensor malfunction.

CODE: E2.
RESULT: Sensor malfunction.

CODE: E1-E0.
RESULT: Communication malfunction Phase sequence or lack of phase.

CODE: PF.
RESULT: Other Protection.

CODE: PE.
RESULT: Oil Balance.

CODE: PD.
RESULT: Oil Return.

CODE: PA.
RESULT: Defrost Protection.

CODE: P8.
RESULT: Compressor Current 3rd Protection.

CODE: P7.
RESULT: Compressor Current 2nd Protection.

CODE: P5.
RESULT: Condenser High Temp. Protection.

CODE: P4.
RESULT: Discharge Pipe Temp. Protection.

CODE: P3.
RESULT: Compressor Current 1st Protection.

CODE: P2.
RESULT: Discharge Low- pressure Protection.

CODE: P1-P0.
RESULT: Discharge High- pressure Protection Compressor High Temp. Protection.

Malfunction Code of Outdoor unit.

CODE: E1.
RESULT: Phase sequence error.

CODE: E2.
RESULT: Communication malfunction between indoor/outdoor units.

CODE: E3.
RESULT: T3 temperature sensor malfunction.

CODE: E4.
RESULT: T4 temperature sensor malfunction.

CODE: E5.
RESULT: T5 temperature sensor malfunction.

CODE: E6.
RESULT: Water-level alarm malfunction.

York Central Air Conditioning Error Codes,

CODE: EF.
RESULT: Other malfunction PF Other Protection.

CODE: EE.
RESULT: Water level checking malfunction PE Reserve.

CODE: ED.
RESULT: Outdoor protection PD Reserve.

CODE: EC.
RESULT: Clear malfunction PC Reserve.

CODE: EB.
RESULT: Inverter Module Protection PB Reserve.

CODE: EA.
RESULT: Compressor Over-current (4 times) PA Reserve.

CODE: E9.
RESULT: Communication malfunction between PCB and Display board P9 Reserve.

CODE: E8.
RESULT: Fan motor checking out of control P8 Compressor Over-current.

CODE: E7.
RESULT: EEPROM malfunction P7 Power Lack/Over Volt Protection.

CODE: E6.
RESULT: Over-zero checking malfunction P6 Discharge Low-pressure Protection.

CODE: E5.
RESULT: T3 sensor malfunction P5 Discharge High-pressure Protection.

CODE: E4.
RESULT: T2B sensor malfunction P4 Discharge Pipe Temp. Protection.

CODE: E3.
RESULT: T2A sensor malfunction P3 Compressor Temp. Protection.

CODE: E2.
RESULT: T1 sensor malfunction P2 Condenser High Temp. Protection.

CODE: E1.
RESULT: Communication malfunction P1 Anti-cooling or Defrost Protection.

CODE: E0.
RESULT: Phase sequence or lack of phase P0 Evaporator Temp. Protection.

CODE: 03#.
RESULT: CCM/PC(gateway) Communication Malfunction.

CODE: 02#.
RESULT: CCM/Function Module Communication Malfunction.

CODE: 01#.
RESULT: CCM/NIM Communication Malfunction.

CODE: 00#.
RESULT: CCM/PCB Communication Malfunction.

York Wall Mounted Type Ac Error Codes.

CODE: E7.
RESULT: Communication fault between indoor and outdoor units.

CODE: E1.
RESULT: Room temperature sensor failure.

CODE: E4.
RESULT: Indoor EEPROM error.

CODE: E14.
RESULT: Indoor fan motor malfunction.

CODE: F12.
RESULT: Outdoor EEPROM error.

CODE: F1.
RESULT: The protection of IPM.

CODE: F22.
RESULT: Overcurrent protection of AC electricity for the outdoor model.

CODE: F3.
RESULT: Communication fault between the IPM and outdoor PCB.

CODE: F19.
RESULT: Power voltage is too high or low.

CODE: F4.
RESULT: Overheat protection for Discharge temperature.

CODE: F8.
RESULT: Outdoor DC fan motor fault.

CODE: F21.
RESULT: Defrost temperature sensor failure.

CODE: F7.
RESULT: Suction temperature sensor failure.

CODE: F6.
RESULT: Ambient temperature sensor failure.

CODE: F25.
RESULT: Discharge temperature sensor failure.

CODE: F11.
RESULT: deviate from the normal for the compressor.

CODE: F28.
RESULT: Loop of the station detect error.

CODE: F2.
RESULT: Overcurrent of the compressor.

CODE: F23.
RESULT: Overcurrent protection for single-phase of the compressor.


See What Our Customers Are Saying:

by Roy in Pickering on Twintech Heating and Cooling

I was referred to Twintech by a neighbour and was not disappointed. Not only was the customer service excellent their workmanship was second to none. Greg and Grant work extremely clean covering the pathway to the furnace room, labeling the essential parts, left the area spotless and were efficient. They cleaned up the mess left by the previous installers (wiring, improperly installed AC coil, and gaps in venting etc). They also ran through the operation of the new furnace and gave me some maintenance tips. Greg and Grant are professional and all around good guys. I will definitely recommend their service to anyone without hesitation.

by Peter Buck, Pickering on Twintech Heating and Cooling

Very satisfied with service from Twintech , beginning with all the information provided by Dave , which helped make the decision much easier . Installation was very smooth & done on time as promised & cleanup was well done . Would definitely recommend this company & use them again for any future needs . Well done.

by Angela from Ajax on Twintech Heating and Cooling

Twintech Heating & Cooling Inc. came in and replaced my 39 year old furnace with a beautiful Napoleon variable high efficiency furnace! Their work was efficient and professional and they were a pleasure to deal with, from sales to installation! I would highly recommend them.

by Scott and Sandra in Ajax on Twintech Heating and Cooling

After receiving numerous quotes to replace my old furnace and AC unit (which was 20 years old) I went with Twintech. Dave, in sales, answered questions professionally and promptly and worked diligently in order to secure my business. Installation was scheduled the week after and Greg and Peter showed up, as scheduled, and did a fine job installing both units. The site was left tidy and neat. I would highly recommend Twintech for your furnace and AC work.

by Linda from Whitby on Twintech Heating and Cooling

I chose TwinTech because they installed my new furnace a few years ago and did a great job. When they installed my new A/C, they replaced all parts -- the copper pipes, the housing on top of the furnace and the wiring. (Apparently, the wiring for my old A/C was insufficient.) Their pricing was competitive. The sales representative came to see me within a few hours of my call. My new A/C was installed a few days later and I couldn't be happier with Twintech's professionalism and work. I would recommend TwinTech to any homeowner.

by george polychronis from Whitby on Twintech Heating and Cooling

Had a great experience with this company. Great price and great customer service. You wont be disappointed with twintech. Discussed the job with Greg while he was installing who was extremely informative and obviously enjoys the work he does.

by Nuzio in Markham on Twintech Heating and Cooling

I needed my AC unit relocated due to upcoming landscape work. I reached out to the Twintech team through Homestars. Dave connected with me immediately to discuss the project and various options. We decided the best option was to mount the unit on the wall. Greg was in touch with me the same day as well and we scheduled the work for later that same week. This was a small job so I did not think I would get immediate attention. The Twintech team exceeded my expectations in every respect. They were very knowledgeable and friendly. The team arrived exactly on time on the scheduled day and worked efficiently to get the job done quickly. I would definitely use Twintech again for any Heating and AC projects.

by Leslie B, Pickering on Twintech Heating and Cooling

I have used Greg Dainty for over 15 years in 3 different homes, for heating, cooling, pool heaters, appliances and bbq lines. Greg has always been so professional, friendly and the workmanship nothing short of fantastic. Greg has always discussed my options and fixing versus replacing, giving his honest opinion and what works best for me cost effective wise and long term. I have valued his opinion so much and have not trusted my gas needs with anyone since using him. I have also referred him to many of my friends and family and have always been so thankful with how well and quickly he looks after us all. I hold Greg in the highest regard and would recommend him to anyone with complete confidence!

by Marcel M, Whitby ON on Twintech Heating and Cooling

Really nice honest guys. It was a pleasure to do business with a company that does exactly what they say they’re going to do! My basement was cleaner after they installed my new furnace and AC. Thanks again Greg and Grant and for doing such a great job.

by George In Pickering on Twintech Heating and Cooling

5 star service!! I had twin tech install a high efficiency furnace and hot water tank at my home. I am taking time to write this review as a thanks for what I viewed as next level service that went above and beyond. Prior to installation they explained my specific options without pushy sales tactics and up front costs. Greg and Grant replaced a large portion of the duct work (built in their own shop) that had rusted over the years which resulted in a great looking job. It was a pleasure to work with people are passionate and take pride in their work. Following the installation they explained all aspects and maintenance of the new equipment. Products have worked flawlessly. Thanks again Greg and Grant! Highly recommend!!

See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

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.

by Robert Mizuno on Twintech Heating and Cooling

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!

by Ruth on Twintech Heating and Cooling

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!

by Anna Chin on Twintech Heating and Cooling

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!

by Connor Agnew on Twintech Heating and Cooling

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.

36 Year Old AC Unit Question

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - April 16, 2023

I have a 36 year old Luxaire AC unit that needs to be replaced. It has never leaked -- but the compressor is giving out. (new relay, new capacitors, newer air handler) The compressor has been on it's last legs the last couple of years but a

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Ducted heat pump sizing help

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - September 11, 2023

Hello all! I'm researching updating my houses current ducted heat pump system to a newer hyper/max heat system (16-18+ seer). Typical 1997 built 2 story 1600sqft living space house with basement located near Columbus Ohio. Current system is

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Understanding Furnace Efficiency Ratings

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - December 11, 2024

Furnace efficiency ratings are essential for homeowners looking to upgrade their heating systems. They measure how effectively a furnace converts energy (natural gas, propane, or electricity) into heat for your home. Here’s a breakdown to help

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Clever Ways to Save on Electricity

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - July 14, 2022

It is never too late to start saving electricity. When it comes to your energy consumption, there are about a million and one tweaks you can make that do not require you to go out on a limb. The little changes you do can make a world of difference on

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