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What Do These Furnace Error Codes Mean?
Posted On: September 21, 2024
Furnace error codes are diagnostic signals that help identify problems with the furnace's operation. Each code represents a specific issue that needs to be addressed, typically related to components like the thermostat, sensors, or burners. Here's a breakdown of some common furnace error codes:
1. Error Code 1 Flash:
- Issue: Furnace is in a lockout mode.
- Meaning: This typically happens after three failed ignition attempts. The furnace will shut down for safety reasons.
- Solution: Reset the furnace or call a technician to check the ignition system.
2. Error Code 2 Flashes:
- Issue: Pressure switch stuck closed.
- Meaning: The pressure switch monitors the venting system. If it’s stuck, it means the furnace might be having issues with the venting process.
- Solution: Check for blockages in the vent pipe or replace the pressure switch.
3. Error Code 3 Flashes:
- Issue: Pressure switch stuck open.
- Meaning: The switch is open when it should be closed during normal furnace operation.
- Solution: Ensure the vent pipes are clear, and the switch is functioning properly.
4. Error Code 4 Flashes:
- Issue: Limit switch open.
- Meaning: The limit switch is a safety device that shuts off the furnace if it overheats.
- Solution: Check for restricted airflow due to dirty filters or obstructed vents.
5. Error Code 5 Flashes:
- Issue: Flame sensor failure.
- Meaning: The furnace cannot detect a flame, which could indicate a dirty or faulty flame sensor.
- Solution: Clean the flame sensor or replace it if necessary.
6. Error Code 6 Flashes:
- Issue: Ignition lockout.
- Meaning: After three failed ignition attempts, the furnace will enter lockout mode.
- Solution: Check the gas supply and ignition system, and reset the furnace.
7. Error Code 7 Flashes:
- Issue: Gas valve stuck closed.
- Meaning: The furnace cannot get the gas needed for combustion.
- Solution: Inspect the gas valve and ensure it’s operating correctly.
8. Error Code 8 Flashes:
- Issue: Low voltage issue.
- Meaning: The furnace is not receiving adequate power to function properly.
- Solution: Check the electrical connections and wiring to the furnace.
Each brand of furnace may have different error codes, so it's important to refer to the furnace’s manual for specific meanings or call a professional HVAC technician if you're unsure about any particular code.
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See What Our Customers Are Saying:
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. Ive 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, dont 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!
Apr 28, 2022
I left a live chat message on their website that my air conditioning was not working. Within 1hr a representative called me to discuss my options.
The next day he came to the house to review my needs and give me a price for a new system. Price quoted was less than I expected and the installation was completed the following day. I found their salesman and the installers very knowledgeable and easy to deal with. All my questions were answered. Everything was properly explained in regards to what unit was needed and why, along with instruction where needed for use.
The installers made sure everything was working properly before they left.
Apr 28, 2022
This is to thank Twintech Heating and Cooling for their exceptional and timely service. Mitch, their technician was very courteous and generous with his time right from his first meeting with us. He not only took the time to check everything but also educated us on why we needed what he recommended. Greg and Mitch graciously accommodated us on our requested day and time for job to be done. They were both very courteous and responsive to our needs and special requests especially in a tight spot. The job was finished neatly and on time. Thank you Twintech for your great service !
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