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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:
Jul 23, 2017
I have used Twintech many times over the years. They always arrive quickly and get the issue fixed. The most recent incident was when my air conditioner broke last week I called Greg at 11:30am and he was at my home by 2:30pm he had the unit fixed by 3:30pm. Twintech are very reliable and honest and they are experts in the field. I have already recommended them to many of my friends. I would not use anyone but them for my heating and air conditioning issues.
Jul 17, 2017
I would highly recommend these guys, professional, fast and competitive pricing. I moved into this place with no working AC unit with a 8 month baby, he was able to come with in a week to fix even in the busy summer days. He really values his customers , I am already recommending to my neighbors.
Jul 2, 2017
Very impressed they arrive to quote even though I had forgotten to call them back to confirm date & time. They showed the day before installation to deliver the unit. Returned the next day as promised at 9am. Project was completed in a professional manner. They even fixed a few things that they noticed were not installed correctly, or to code by previous heating & air contractors we had at our residence before. Would recommend this company to everyone!
Jun 29, 2017
Greg removed old oil furnace and oil tank from basement relocated new Napoleon propane furnace to allow duct work to be rerouted to a much more suitable location. Moved air conditioner to the new furnace. Dave recommended two available grants to assist with cost. They kept to their original quoted price which was substantially lower than a competitors for the same furnace and work. They completed the work as stated when stated and left the area clean and tidy. We are very pleased with the outcome.
Jun 28, 2017
Twintech installed a Goodman furnace and ac init. Very professional install, both units are working well.
Jun 28, 2017
We had Grant and Greg Dainty quote to replace our 20 yr old furnace. I have known them for years and have had other jobs done by them ( AC and Pool Htr). The price was very reasonable and the job was completed in one day.
Jun 23, 2017
TwinTech was the right choice. Our consultation with Dave set the tone. Professional and knowledgeable, we even received a follow-up call within hours of our install completion, wow! TwinTech arrived as scheduled to install our A/C unit. Within minutes of arrival Greg noted and explained a few out of code faults on our furnace installed by another company, problems fixed, thanks TwinTech. Greg, Grant and "Subaru" Pete were meticulous start to finish. Highly recommended!
Jun 13, 2017
Twintech replaced our aging +20 yrs old Furnace & AC with the variable high efficiency Napoleon Furnace matched with the Goodman AC. Sales guy ,Dave was great, gave a no pressure estimate, explained about the Government Rebate program which they took care of completely including arranging the home energy audit. On the scheduled day Greg and his team arrived on time, did a great job and completed the same day , extremely professional and courteous, cleaned up everything , tested the system, Greg took his time to explain the setup. Very impressed with the Napoleon Furnace 9600 which did a great job in maintaining a comfortable temperature last winter and now with the hot weather the Goodman AC cooled the house in much less time than the old AC unit could ever. From start to finish Twintech were great and have no hesitation in recommending them 100%.
Jun 13, 2017
The Twintech team did an excellent job installing our new Goodman air conditioner. They were polite and professional. Greg was knowledgeable and clearly experienced. Thank you Twintech for bringing our cooling system up to current regulations. Job well done!
Jun 11, 2017
Dave from TwinTech was very knowledgeable, professional and thorough in the buying process. He helped us to identify the best furnace for our home and our budget. When we needed a new filter a year later and seemed to have a problem finding the right one, I called Dave up and he delivered a filter to me the next day! The cost was on par with other retailers, but it was this unexpected personal service that really was impressive. The furnace? Works like a charm.
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