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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
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 !
Apr 28, 2022
They came the day and time they had planned for us and were very fast and efficient! The AC works amazing and it is amazing during the heat of the summer we have already got! Thanks for everything you did for us!
Apr 28, 2022
Would recommend this company to friends and family in a heartbeat. Very professional , on time and left no mess when the job was done.
Apr 28, 2022
Great customer service. Responsive and professional. I would highly recommend Twintech, I used them previously for repair service and a new air conditioner- very satisfied.
Apr 5, 2022
Our air conditioner failed. Made a call and within 15 min a technician was at our door.
The issue was fixed and many suggestions were provided.
Thanks to Mitch. Great service !
Apr 5, 2022
Our furnace was rattling, as soon as we put our air conditioner on this past week. We had researched looking for a company that was Registered with Better Business Bureau, and this company TwinTech, had A+ Rating. Scott, was immediately helpful via text/phone and sent his technician as soon as he was able...Mitchell/technician provided great professional service. Thank you TwinTech.
Sean and Debbie
Apr 5, 2022
I contacted various companies when looking to install a new furnace and I found Twintech to be transparent with their communication and approach. They had options to suit my various requirements and the price vs quality was very good. The after installation communication was also very good and they answered all queries I had.
Apr 5, 2022
My furnace broke down last month. The team was quick to respond, courteous, professional and mindful of COVID-19 concerns. I highly recommend them if you are considering replacing or servicing your HVAC equipment.
Apr 5, 2022
I was very happy with the installation and price. I would definitely recommend. Thank you Twintech.
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