Troubleshooting a Trane XV90 Heating System: Two Red Blinks and Cold Air (2023 Update)

Well, the Trane XV90 system blinking two red blinks between green blinks typically means there's an issue with the furnace's pressure switch circuit. But there could be other causes for the system blowing cold air, such as a clogged air filter or a problem with the thermocouple. Here's what you can do to troubleshoot the issue:

Check the air filter and replace if necessary.

Inspect the thermocouple for proper connection and signs of damage.

Verify that the draft inducer is running and the vent pipe is clear.

Check the pressure switch hose for any signs of restriction or damage.

You'll need a screwdriver, a fresh air filter, and a multimeter to perform these steps. If you're unsure about any part of the process or need more guidance, it may be best to call in a professional to avoid causing any further damage to your system.

It's always a good idea to take some basic troubleshooting steps when dealing with heating system issues, such as checking the air filter, flame sensor, igniter, control board, and electrical connections. By doing so, you may be able to identify and resolve the problem yourself, saving you time and money. If these steps don't solve the issue, it may be best to call a professional for further assistance.