Carrier furnace error 13

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Carrier furnace error 13

‍What is Carrier Furnace Error 13?

Error code 13 indicates an issue with the furnace’s pressure switch. This component is responsible for monitoring the pressure in the furnace’s heat exchanger, which is the part of the unit that heats the air. If the pressure switch cannot detect the appropriate level of pressure, it will shut down the furnace to avoid any potential damage.

The pressure switch is usually located near the furnace’s exhaust and is typically a small box with two wires connected to it. When the switch senses a problem, it will send a signal to the furnace’s control board, which will then display the error code 13.

Common Causes of Carrier Furnace Error 13

There are several reasons why your furnace may be displaying error code 13. Some of the most common causes are:

  1. Clogged air filter: A dirty air filter can restrict air flow, which can cause the pressure switch to fail.
  2. Blocked exhaust: If the exhaust from your furnace is blocked, the heat exchanger will not be able to expel the exhaust gases, resulting in a buildup of pressure that will trip the switch.
  3. Faulty pressure switch: The pressure switch may be faulty, causing it to send false signals to the control board.
  4. Incorrect wiring: Incorrect wiring of the pressure switch may also be responsible for error code 13.

Troubleshooting Steps for Carrier Furnace Error 13

If you’re receiving error code 13, the first step is to locate the pressure switch. Once you’ve found it, follow these steps to troubleshoot the issue:

  1. Check the air filter: Remove the air filter and inspect it. If it’s dirty, replace it with a clean one.
  2. Check the exhaust: Make sure that the exhaust from your furnace isn’t blocked or restricted in any way.
  3. Check the wiring: Make sure that the wiring for the pressure switch is correct.
  4. Check the switch: If all of the above steps have been completed, it may be time to check the switch itself. Use a multimeter to test the switch for issues.

Replacing Parts for Carrier Furnace Error 13

If the troubleshooting steps above have not solved the issue, it may be time to replace the pressure switch. This is a relatively simple task that can be completed by most homeowners.

To do this, you will need to turn off the power to the furnace and then disconnect the wires from the pressure switch. You can then unscrew the switch and replace it with a new one. Make sure to check the wiring before turning the power back on.

Contacting a Carrier Furnace Technician

If you’re still having issues with error code 13, it may be time to contact a Carrier furnace technician. They will be able to diagnose the issue and replace any faulty parts if needed.

You can search online for reviews and ratings to find a qualified technician. You can also call your local HVAC contractor and ask for referrals. Make sure to ask any questions you may have before hiring a technician.

Common Questions about Carrier Furnace Error 13

Q: What should I do if I’m still getting error code 13? A: If you’re still getting error code 13 after following the troubleshooting steps, it may be time to contact a Carrier furnace technician. They will be able to diagnose and fix the issue quickly and easily.

Q: How often should I replace the air filter? A: It’s recommended that you replace your air filter every three months or so, to ensure optimal performance and efficiency from your furnace.

Q: How do I know if the pressure switch is faulty? A: You can use a multimeter to check the pressure switch for any issues. If the switch is faulty, it will need to be replaced.


Error code 13 on your Carrier furnace doesn’t have to be a headache. By following the steps outlined in this article, you can quickly diagnose and fix the issue to get back to a comfortable and warm home.

If you’re still having issues, it may be time to contact a qualified Carrier furnace technician. They will be able to diagnose and repair any issues quickly and easily.

If you have any further questions about Carrier furnace error 13, feel free to contact us. We’re always happy to help!

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