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It’s never a great start to the morning with your carrier furnace showing an error code. And it can only worsen if you don’t have time to call an electrician to fix it.
What are the reasons behind the Carrier error code 13?
The reason behind the carrier error code 13 is the limit switch lockout. This signifies that your furnace will resume in 3 hours. The limit circuit safeguards the furnace against overheating. For inadequate circulation through the heating element, the heat transfers from the furnace to the ducting.
Learn more about the solution and some helpful hints throughout this article. Or if you are looking for professional help, Call 1-877-342-2087
To Find 24/7 AC/Heater Repair In Your Area today.
What Is Carrier Error Code 13?
The carrier error code 13 indicates the problem of limit switch lockout. This error code is generated after 10 consecutive failed limit trips. During severe heat, or three successive low heat limit excursions.
The good news is that it automatically resets after three hours. After the reset check, the gas adjusts itself for irrigated high or low heat. Because sometimes the high-heat solenoid becomes stuck in the gas valve.
What Exactly Is a Limit Switch Lockout Error?
Simply put, the limit switch lockout error is a failsafe measure for Carrier furnaces.To avoid danger, if a system senses a hazardous state, the thermostat controller will turn off. This is referred to as an engine switch lockout. It can also be triggered by a variety of different sensors located inside your thermostat.
If your thermostat is shut off, it will most likely stay locked out until it’s reset. Many homeowners lock out their furnaces by attempting to start them. But after numerous attempts without result, they’re unaware that the detector had recognized a dangerous condition.
What Causes the Lockout Error?
The majority of the time, furnaces that are ground enter ignition lockout due to three common problems. The most prevalent lockout causes are outlined here.
Case 1: Broken Heat Detector
One of the most prevalent reasons for error code 13 is faulty heat sensors. The sensor checks for the existence of fire when your furnace starts up. If the sensor is malfunctioning or unclean, it will be unable to detect the flame.
The ignition process will be halted. Most contemporary furnaces will allow you to restart. The furnace will cycle two more times before it enters lockout mode.
Case 2: Inaccurate Igniting
Another commonly seen lockout culprit is the furnace ignitor. The flame sensor will not detect if your furnace igniter does not activate within a few seconds. And the furnace will be turned off by the regulator.
Why is the carrier furnace ignitor not glowing?
Your Carrier furnace ignitor won’t glow unless you ensure all the safety controls are closed. This includes the rollout switches, limit switches, and pressure switches. If they are open, it can lead to overheating issues, resulting in a dangerous outcome.
Your heater will most likely become locked out after the third try. It might be unable to light the main burner if your gas furnace has a pilot light. The Carrier furnace can cause a lockout.
Case 3 of 3: Limit Switch Reaction
A limit switch in your furnace also controls heat transfer temperatures and gas pressure. If the heat or pressure becomes too high or too low, the limit switch closes. It also orders the furnace to shut down and enter lockout mode.
A clogged filter may potentially trip the limit switch by limiting airflow. If you have a contemporary furnace, the status code leads may be able to notify you. And it also triggered the lockout.
How Do You Fix Error Code 13?
The specific technique for unlocking your furnace will vary depending on the culprit. You also need to know the blower motor size of the furnace. It also doesn’t help that the user manual is so much confusing to understand.
So I’ll try my best to explain 4 easy methods to fix your Carrier error code 13. Here are some things you can do before restarting your furnace:
Method 1: Check the Burner
Check the flame sensor for cracks and evidence of deterioration before cleaning or replacing it. If you just see soot or a little corrosion, follow our cleaning flame sensor method. If it doesn’t work, remove the detector and try again when the furnace has been unlocked.
Method 2: Clean or Replace the Air Filter
A blocked air filter might prevent the system from receiving air supply, triggering the limit switch. Simply update the filter to see whether the problem has been resolved.
Want a change of air filters? You can start by taking a look at these few options from Amazon:
| Image | Product | Price |
| Genuine Bryant / Carrier Air Filter | Check Price | |
| Filterbuy Air Filter | Check Price | |
| Carrier/Bryant 16 X 25 MERV 15 Evolution Air Purifier Filter | Check Price |
These Air filters are the perfect replacements for your stock Carrier furnace filters. Highly efficient at purifying the air, these should be your go-to options. Try them out!
For the safety of your family, it’s recommended that air filters be cleaned regularly.
Method 3: Check and Clean the Vent Pipes
Check your vent pipes for debris and signs of obstruction, and clear any blockages you uncover. If you are unable to dislodge the obstruction, call HVAC to replace the pipe piece.
Method 4: Reset the Furnace
Whatever the cause, you’ll need to undertake a reset operation to get your furnace working again. Some newer gas heaters may be able to reset themselves. By shutting off the power, waiting 20 seconds, and then resuming power.
Other furnace models may leave lockout after 1-2 hours and try to restart. Relight your furnace’s pilot light according to the manufacturer’s instructions.
Since none of the above options work for you. So, the best approach is to contact a competent HVAC expert who will evaluate your unit. Also, conduct the required tests and repairs to unlocking your furnace.
Some Quick Tips to Fix It
If you are short on time, then you should go through these quick tips. It will help you identify the problem and fix it quickly. Let’s know what the tips are:
Tip 1: Examine the Switch for Appropriate Operation
Check the high-limit switch for continuity after the furnace has cooled (15 minutes). The high-limit switch is defective if it remains open. If the flame rollout switch is triggered, check for backdrafts to remove and clogged flues. And then the heat exchanger finds the source of the flame rollout.
You may reset the flame rollout switch by pressing the button behind the disc. If the switch remains open after hitting the button, the flame rollout switch is faulty. Look for problems with airflow.
Then examine the filter’s condition. Check that it is not filthy and is not impeding air passage. All vents and return registers should be left open. After that, check the ducts and register grilles for cleanliness. Clean the evaporator coil on the air conditioner.
Tip 2: Examine the Condition of the Blower Wheel
First, check that it is clean and tight and that no blades are lacking. Then check the compressor and battery to ensure that it is working at full speed. Check for enough combustion air. Inspect the entering PVC pipe on 90%+ of furnaces.
Check that the furnace isn’t closed up in a closet. Also, not receiving any combustion air on 80 percent of furnaces. 80% of furnaces get combustion air from the surrounding air.
If everything seems good, increase the speed of the blower motor. Because of altering the speed on the control board during the heat mode.
Frequently Asked Questions (FAQs)
How Much Longer Should a Carrier Furnace be Expected to Last?
Carrier HVAC systems are expected to last between 15 and 25 years. However, this may vary depending on a number of factors. You should preserve your heating and air system’s complete operation and long-term longevity.
What Is the Purpose of a Furnace Flame Rollout Switch?
The flame rollout switch is a furnace safety component that detects the presence of a flame. If the heat outside the combustion process reaches a particular threshold. Then this switch cuts off the gas supply to the furnace.
How Do You Clean a Clogged Heat Exchanger?
Using a wire brush, clean any dust and debris from the heat transfer unit. Also, use the tool to clean any black soot or scaling from the heat exchanger’s chambers. A moist cloth soaked in a gas furnace cleanser. It could also be used to wipe away any dust or scale.
Final Words
Got what you’re looking for? We covered everything about Carrier error code 13. Now you can fix the issue on your own.
If you’re pressed for time or don’t want to deal with it yourself, call an electrician instead: Call 1-877-342-2087
To Find 24/7 AC/Heater Repair In Your Area today.
Be careful when you try to fix it. Wish you all the best.
HVAC tech with over 30 years of experience. Retired and doing repair work on the side around Madison County, AL.