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If your Daikin furnace starts acting up, the good news is that it doesn’t leave you guessing. Like many modern HVAC systems, Daikin furnaces have built-in diagnostics that flash LED codes to indicate specific issues. But while these codes can tell you what’s wrong, they won’t fix the problem for you. In this guide, we’re going to break down each Daikin furnace error code, explain what it means, and — most importantly — tell you how to fix it.Â
Why Choose Daikin Furnace in Canada?
Before we jump into troubleshooting, let’s talk about why Daikin is a solid choice for home heating.
Daikin has been in the HVAC game for decades, and they’ve built a reputation for energy-efficient, high-performance heating and cooling systems. Their furnaces are designed to last, with advanced features like variable-speed blowers, modulating gas valves, and smart diagnostics (which is why you’re here).
With proper furnace maintenance, a Daikin furnace can keep your home warm for 15-20 years. But like any complex system, issues can pop up — and when they do, those flashing LEDs are your first clue about what’s going on.
What Are the Daikin Furnace Error Codes?
Daikin furnaces use an LED light system to communicate issues. When something goes wrong, the control board flashes a specific pattern of LED blinks. Each pattern corresponds to a different issue — whether it’s a failed ignition, airflow problem, or a faulty sensor.
Before you start fixing anything, take note of the LED flashes:
- A single, steady light? That’s a thermostat issue.
- One, two, or more flashes? Each flash pattern corresponds to a specific problem (which we’ll go through below).
- Continuous flashing? Your power wiring might be reversed.
Once you identify the pattern of the blinking red light on your furnace, match it with the troubleshooting steps below.
Daikin Furnace Error Codes & How to Fix Them
Keep in mind that some issues can be resolved quickly, while others may require professional assistance. If you’re not comfortable handling electrical components or gas-related repairs, it’s always best to call a professional furnace repair service.
Code: One LED Flash (Steady On)
- Problem: No signal from the thermostat.
- Fix: Turn off the furnace, check the thermostat wiring connections, and make sure your thermostat is set correctly.
Code: Single LED Flash
- Problem: Furnace lockout due to three failed ignition attempts.
- Fix: Check for gas supply issues. Reset the system by lowering the thermostat for 20 seconds, then raise it back. The furnace will also reset automatically after an hour.
Code: Two LED Flashes
- Problem: The draft inducer motor isn’t working, or the pressure switch is stuck closed.
- Fix: Inspect the inducer motor and pressure switch. If the inducer motor isn’t running, it may need replacing. If the switch is stuck, a technician might need to replace it.
Code: Three LED Flashes
-  Problem: The pressure switch isn’t closing properly.
- Fix: This usually means a blocked vent or an issue with the switch itself. Check for blockages in the exhaust vent, and if necessary, replace the pressure switch.
Code: Four LED Flashes
- Problem: High-limit switch tripped due to overheating.
- Fix: First, turn off the furnace and let it cool. Then, check and replace dirty air filters. If the issue continues, there may be a problem with airflow or a faulty high-limit switch.
Code: Five LED Flashes
- Problem: The system detects a flame when it shouldn’t.
- Fix: This could be due to a slow-closing gas valve. Shut off the gas supply and call a technician to inspect the valve.
Code: Seven LED Flashes
- Problem: Faulty or dirty flame sensor.
- Fix: Turn off the furnace, remove the flame sensor, and clean it with fine sandpaper. If that doesn’t help, replace it.
Code: Continuous Flashing
- Problem: Reverse polarity on power wiring.
- Fix: Check your wiring connections and ensure that the hot and neutral wires are correctly placed.
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Error Code
|
Problem
|
Solution
|
|---|---|---|
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One LED Flash (Steady On)
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No signal from thermostat
|
Check and secure thermostat wiring
|
|
Single LED Flash
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Ignition failure (3 attempts)
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Check gas supply, reset furnace
|
|
Two LED Flashes
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Draft inducer issue or pressure switch stuck
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Inspect and replace faulty components
|
|
Three LED Flashes
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Pressure switch not closing
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Check for vent blockages or replace switch
|
|
Four LED Flashes
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High-limit switch tripped (overheating)
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Replace air filter, check for airflow issues
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|
Five LED Flashes
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Flame detected with no heat call
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Turn off gas, check gas valve
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|
Seven LED Flashes
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Faulty flame sensor
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Clean or replace flame sensor
|
|
Continuous Flashing
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Reversed polarity on power wiring
|
Correct wiring connections
|
How to Prevent Daikin Future Issues
While Daikin furnace error codes help you diagnose problems, the best approach is to prevent them in the first place. Here’s how:
- Replace filters regularly: A clogged filter can cause overheating and airflow issues.
- Clean your flame sensor: A dirty sensor can lead to ignition problems.
- Inspect your vents: Blocked vents can cause pressure switch errors and furnace shutdowns.
- Check thermostat settings: Sometimes, the fix is as simple as adjusting the thermostat.
- Ensure proper airflow: Make sure all supply and return vents are unblocked to keep your furnace running efficiently.
- Schedule annual maintenance: Having a professional inspect your system once a year can help catch minor issues before they turn into major problems.
Monitor for unusual noises or smells: Strange sounds or burning odors could indicate a developing problem that needs immediate attention.
When to Call a Professional for Daikin Furnace Repair
Some furnace issues can be fixed with simple troubleshooting, but others require professional attention. If your Daikin furnace continues displaying error codes even after following these steps, or if you experience recurring issues, it’s time to call a technician.Â
Our team at HVAC Service Solutions works with a variety of furnace problems, from minor sensor malfunctions to more complex system failures. Whether it’s troubleshooting pressure switch errors, ignition failures, or airflow restrictions, we can diagnose and resolve the furnace issue to ensure your home stays warm and comfortable.
Final Thoughts
Understanding Daikin furnace error codes can save you time, money, and frustration. Whether it’s a minor thermostat issue or a more serious airflow problem, knowing what those flashing lights mean is the first step to getting your furnace back on track. And if you ever need expert help, you know who to call — HVAC Service Solutions. Stay warm!
Daikin Furnace Error Codes FAQs
Why is my Daikin furnace showing a blinking LED code?
Your Daikin furnace uses LED codes to diagnose issues. Different blinks correspond to different errors, like ignition failures, pressure problems, or overheating. These codes help pinpoint the cause, but you may need to check filters, vents, the thermostat, or call a pro to fix the issue.
How do I reset the error on my Daikin furnace?
To reset the error, try turning off the furnace using the power switch, wait about 30 seconds, and turn it back on. If the issue persists, check the thermostat and gas valve. Some errors reset automatically once the main issue is fixed, like after replacing a dirty filter or cleaning the vents.
What does one blink of the LED mean?
A single blink usually means the furnace is locked out after three failed ignition attempts. This could be due to no gas flow, a clogged pilot hole, or a faulty igniter. Try checking the gas valve and flame sensor. Sometimes cleaning or replacing the flame sensor will help.
Why won't my Daikin furnace turn on, but there are no error codes?
If your Daikin furnace won’t turn on and no error codes show, the issue could be with the thermostat, the power switch, or a blown fuse. Check that the thermostat is set to heating mode, ensure the power is on, and check the furnace’s main fuse. If everything looks fine, but the furnace still isn’t working, call a professional.
How often should I change the air filter in my Daikin furnace?
It’s recommended to change the air filter every 1-3 months, depending on how dirty the air in your home is. A dirty filter can cause the furnace to overheat and lead to high-temperature switch errors (like 4 blinks of the LED). Regular filter changes help keep the system running smoothly.
Can I fix the error code myself, or do I need a professional?
Some errors, like overheating (4 blinks), can be fixed by replacing the filter or cleaning the vents. However, issues with the gas valve, pressure, or flame sensor need professional repair. If the error code doesn’t go away after fixing the obvious issues, it’s best to call an expert.
What should I do if my Daikin furnace shuts off and shows an overheating error?
An overheating error (4 blinks) means the heat exchanger got too hot. This could be due to a dirty air filter, blocked vents, or a faulty fan. Try replacing the filter and ensure the ducts aren’t blocked. If the problem persists, the fan or safety switch may need to be checked.
How do I know if the issue is with the thermostat rather than the furnace?
If your Daikin furnace won’t turn on, try setting the thermostat to a higher temperature and listen for a click. If there’s no response, check the batteries (if applicable) and wire connections. If you can turn the fan on manually through the thermostat settings, then the furnace is getting power, and the issue is probably with the thermostat.
Why is the LED light solid on my Daikin furnace?
A solid (non-blinking) LED usually indicates a problem with the thermostat or no signal to start. Check the thermostat wire connections, make sure it’s set correctly, and try restarting the furnace. If that doesn’t help, the issue might be with the control board.
How can I prevent errors in my Daikin furnace in the future?
Regular maintenance is key to preventing issues. Change the air filters, clean the flame sensor, check the vents, and keep an eye on thermostat settings. Also, it’s a good idea to schedule a professional check-up once a year to ensure all components are working properly. This will help avoid unexpected breakdowns in cold weather.
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