Is Your Furnace Blinking? What Those Furnace Error Codes Mean
When your furnace stops working, the first thing to check is whether it’s displaying an error code. These furnace error codes help diagnose problems, from ignition failures to airflow restrictions. Understanding what these codes mean can save you time and frustration, and in many cases, you can resolve minor issues yourself. However, if you’re dealing with a serious furnace problem in Salt Lake City, West Valley City, West Jordan, Sandy, Taylorsville, or South Jordan, it’s best to call a professional HVAC technician.
Common Furnace Error Codes and What They Mean
1. One Flash: Ignition Failure
A single blinking light usually means the furnace is having trouble igniting. This could be due to a faulty igniter, a dirty flame sensor, or a gas supply issue. If your furnace isn’t lighting properly, try resetting it, but if the issue persists, it may need professional repair.
2. Two Flashes: Pressure Switch Problem
If you see two blinking lights, your furnace may have a clogged condensate drain or a malfunctioning pressure switch. A blocked vent pipe or a dirty air filter can also trigger this code. Check your filter first—if it’s dirty, replace it and restart the furnace.
3. Three Flashes: Inducer Motor Issue
Your furnace’s inducer motor helps vent harmful gases out of your home. Three flashes usually indicate that the motor isn’t working correctly due to a blockage, wiring problem, or failed motor. This issue requires professional troubleshooting.
4. Four Flashes: Open High Limit Switch
This error means your furnace is overheating. A dirty air filter, restricted airflow, or a malfunctioning blower motor can cause this. Turn off your furnace immediately and check for obstructions before restarting.
5. Five Flashes: Flame Sensor Issue
A flame sensor detects whether the burner has ignited. If the sensor is dirty or malfunctioning, your furnace will shut down for safety. Cleaning the flame sensor with a fine abrasive pad can sometimes resolve the issue, but a professional inspection is recommended if the problem continues.
6. Seven Flashes: Gas Valve Failure
This serious issue means the gas valve isn’t opening properly. It could be due to a wiring issue or a faulty valve, and it should only be handled by a certified HVAC technician.
What to Do When You See a Furnace Error Code
- Check your thermostat – Ensure it’s set to “heat” and the temperature is above room temperature.
- Replace your air filter – A clogged filter can trigger multiple error codes.
- Restart your furnace – Sometimes, a simple reset can clear the error.
- Inspect your vents – Blocked or dirty vents can cause airflow issues leading to shutdowns.
- Call an HVAC professional – If you’re unsure or the problem persists, Paradise Heating and Air can diagnose and repair the issue quickly.
Reliable Furnace Repairs in Your Area
If your furnace is flashing an error code and won’t turn on, Paradise Heating and Air provides expert HVAC services in Draper, Murray, Riverton, Holladay, Cottonwood Heights, Bountiful, and more. We’ll quickly diagnose the problem and restore your home’s comfort.
Need furnace repair? Contact us today to schedule a service appointment!
FAQs
How do I find the error code on my furnace?
Most modern furnaces have an LED light that flashes a sequence of error codes. Locate the control panel on your furnace, and count the number of flashes. Then, check the inside of the furnace panel or your owner’s manual for the meaning of the code. If you’re unsure, our team at Paradise Heating and Air can diagnose and fix the issue for you.
How do I reset my furnace?
To reset your furnace, follow these steps:
- Turn off the power – Locate the power switch on the furnace or flip the breaker off.
- Wait a few minutes – Give it about 5-10 minutes to reset.
- Turn the power back on – Restore power and see if the furnace starts normally.
- Check for error codes – If an error code persists, it may need professional attention.
If your furnace still isn’t working after a reset, it could be a sign of a deeper issue that requires expert repair.
Why is my furnace running but not putting out heat?
If your furnace is blowing air but not producing heat, the problem could be:
- A dirty air filter restricting airflow.
- A malfunctioning thermostat not signaling the furnace to heat.
- An extinguished pilot light or faulty ignition system.
- A clogged burner preventing proper combustion.
Try replacing your air filter and checking your thermostat settings. If the issue continues, it’s time to schedule a furnace inspection.
What does a blinking orange light on a furnace mean?
A blinking orange light typically indicates a problem with the ignition or flame sensor. It could mean the furnace is locked out due to repeated ignition failures, a gas supply issue, or a dirty flame sensor. Resetting the furnace may help, but if the orange light persists, you’ll need a professional to inspect and repair the system.
How do I fix a blinking green light on my furnace?
A blinking green light can mean different things depending on the furnace model. In many cases, it signals that the blower motor is running, but if it’s flashing rapidly, it could indicate a control board issue or a sensor malfunction. Try resetting the furnace first, but if the blinking green light continues, contact Paradise Heating and Air for a professional diagnosis and repair.