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:
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!
The Furnace in Winter: A Simple Homeowner's Guide
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - October 26, 2024
As the cold season arrives, keeping your home warm is essential, and your furnace is at the heart of it all. Here's a straightforward guide to help you ensure your furnace runs smoothly all winter long: 1. Understand How Your Furnace Works
Read MoreIs My Heat Pump Malfunctioning?
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - January 25, 2024
I can certainly help you troubleshoot common issues that may indicate a malfunction. Here are a few steps you can take to assess the situation: Check the Thermostat: Ensure that the thermostat is set to the appropriate temperature and mode (
Read MoreIncreasing the Longevity of Your Heat Pump
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - October 30, 2023
Increasing the longevity of your heat pump involves regular maintenance and adopting good practices to ensure optimal performance. Here are some tips to help extend the lifespan of your heat pump: Regular Maintenance: Clean or Replac
Read MoreCan I Upgrade My Furnace Unit?
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - November 3, 2023
Yes, it is often possible to upgrade a furnace unit to improve its performance, energy efficiency, and features. Here are some common upgrades that you might consider: High-Efficiency Furnace: Upgrading to a high-efficiency furnace can signi
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