Durham Region Air Conditioning Repair, Service and Installation
If you're looking for help fixing your Heil Air Conditioner, look no further! Our comprehensive Heil Air Conditioner repair guide will explain common issues, provide troubleshooting tips, and show you how to read your model's error codes..
R-410A Split System Heat Pump.
CODE: Green "POWER".
RESULT: Module has power.
FIX: Supply voltage is present at module terminals.
RESULT: Module has power.
FIX: Supply voltage is present at module terminals.
CODE: Red "TRIP".
RESULT: Thermostat demand signal. Y1 is present, but the compressor is not running.
FIX:
RESULT: Thermostat demand signal. Y1 is present, but the compressor is not running.
FIX:
- Compressor protector is open.
- Outdoor unit power disconnect is open.
- Compressor circuit breaker or fuse(s) is open.
- Broken wire or connector is not making contact.
- Low pressure switch open if present in system.
- Compressor contactor has failed open.
CODE: Yellow "ALERT" - Flash Code 1.
RESULT: Long Run Time - Compressor is running extremely long run cycles.
FIX:
RESULT: Long Run Time - Compressor is running extremely long run cycles.
FIX:
- Low refrigerant charge.
- Evaporator blower is not running.
- Evaporator coil is frozen.
- Faulty metering device.
- Condenser coil is dirty.
- Liquid line restriction (filter drier blocked if present in system).
- Thermostat is malfunctioning.
CODE: Yellow "ALERT" - Flash Code 2.
RESULT: System Pressure Trip - Discharge or suction pressure out of limits or compressor overloaded.
FIX:
RESULT: System Pressure Trip - Discharge or suction pressure out of limits or compressor overloaded.
FIX:
- High head pressure.
- Condenser coil poor air circulation (dirty, blocked, damaged).
- Condenser fan is not running.
- Return air duct has substantial leakage.
- If low pressure switch present in system, check Flash Code 1 information.
CODE: Yellow "ALERT" - Flash Code 3.
RESULT: Short Cycling - Compressor is running only briefly.
FIX:
RESULT: Short Cycling - Compressor is running only briefly.
FIX:
- Thermostat demand signal is intermittent.
- Time delay relay or control board defective.
- If high pressure switch present go to Flash Code 2 information.
- If low pressure switch present go to Flash Code 1 information.
CODE: Yellow "ALERT" - Flash Code 4.
RESULT: Locked Rotor.
FIX:
RESULT: Locked Rotor.
FIX:
- Run capacitor has failed.
- Low line voltage (contact utility if voltage at disconnect is low).
- Excessive liquid refrigerant in compressor.
- Compressor bearings are seized.
CODE: Yellow "ALERT" - Flash Code 5.
RESULT: Open Circuit.
FIX:
RESULT: Open Circuit.
FIX:
- Outdoor unit power disconnect is open.
- Compressor circuit breaker or fuse(s) is open.
- Compressor contactor has failed open.
- High pressure switch is open and requires manual reset.
- Open circuit in compressor supply wiring or connections.
- Unusually long compressor protector reset time due to extreme ambient temperature.
- Compressor windings are damaged.
CODE: Yellow "ALERT" - Flash Code 6.
RESULT: Open Start Circuit. Current only in run circuit.
FIX:
RESULT: Open Start Circuit. Current only in run circuit.
FIX:
- Run capacitor has failed.
- Open circuit in compressor start wiring or connections.
- Compressor start winding is damaged.
CODE: Yellow "ALERT" - Flash Code 7.
RESULT: Open Run Circuit - Current only in start circuit.
FIX:
RESULT: Open Run Circuit - Current only in start circuit.
FIX:
- Open circuit in compressor run wiring or connections.
- Compressor run winding is damaged.
CODE: Yellow "ALERT" - Flash Code 8.
RESULT: Welded Contactor - Compressor always runs.
FIX:
RESULT: Welded Contactor - Compressor always runs.
FIX:
- Compressor contactor has failed closed.
- Thermostat demand signal not connected to module.
CODE: Yellow "ALERT" - Flash Code 9.
RESULT: Low Voltage - Control circuit < 17VAC.
FIX:
RESULT: Low Voltage - Control circuit < 17VAC.
FIX:
- Control circuit transformer is overloaded.
- Low line voltage (contact utility if voltage at disconnect is low).
See What Our Customers Are Saying:
Jul 3, 2022
Great service and great people to deal with, from sales to installer. I highly recommend this company.
Apr 28, 2022
Twintech replaced our aging furnace and air conditioner recently. I highly recommend this company. Their quote was competitive, they were on time and respectful of our home and extremely professional. From the salesman to the installers and the owner who followed up afterward to ensure we were satisfied, we are very pleased with the service. We are looking forward to working with this company for all of our HVAC needs for the years to come. Excellent workmanship and service!
Apr 28, 2022
We wanted to get our AC replaced as it was 22-years old and added to this our furnace was costing more and more to repair. So, we decided to get both the furnace and AC replaced.
After going through a few quotes and product reviews we decided to go with Twintech. The three-men crew arrived early in the morning, wasted no time and got to work right away. By 2:00 pm, they were all done. IÂ’ve found their work to be top notch and they were completely professional. I had all my questions answered to my satisfaction both during the progress of their work and at end.
I have pleasure in recommending Twintech to anyone who is looking to get their furnace or Ac replaced
Nathan S.
Apr 28, 2022
Our air conditioner died On a Saturday and within hours Dave came out to take a look and discuss replacement/repair options.
The new air conditioner was installed on the Wednesday. The new unit was installed quickly. The installers were friendly and cleaned up afterwards.
We noticed a slight leak around the furnace that night and they came out the next day and fixed the issue. It has been working great and is quieter than our previous unit.
Very satisfied and would highly recommend TwinTech.
Apr 28, 2022
I contacted TwinTech to replace my 20-year old A/C. Dave, their service rep, promptly replied and was at my home within 2 hours. He was friendly and knowledgeable and didn't try to upgrade or oversell their A/C units but suggested the best fit for my small 1000 feet bungalow. Although this was during a heatwave and very busy, they were able to fit me in 2 days later. The TwinTech crew installed a 1.5 ton Ducane A/C unit that is now running smoothly while maintaining a constant cooling temperature. The crew were very courteous, professional and efficient and I will definitely recommend TwinTech to family and friends. I much appreciated your great service.
Nancy M., Oshawa
Apr 28, 2022
We had a great experience. The guys who installed our a/c did a nice job. Cleaned up.
Apr 28, 2022
excellent crew, fast and efficient! Would call them again when I need a new furnace.
Apr 28, 2022
Professional, courteous and efficient, donÂ’t need to say more than that! Use them you will not regret it.
Apr 28, 2022
TwinTech was a pleasure to deal with from the estimate through installation. We replaced a 28 year old a/c unit with one recommended by TwinTech's sales representative Dave who took the time to go over the product with us and answer any questions. The warranty is for 10 years parts and labour and they will complete the registration for you. Installation was by Greg (owner) and Mitch and Spencer who were quick and efficient and left everything clean and tidy.
Apr 28, 2022
Very professional, from the sales consultation and inspection to the final installation. Met every expectations we had for the job. A local business with great client support. We highly recommend. Twintech is a blue chip! Thanks!
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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