What does 349 mean?

This code appears in non-communicating mode and indicates the jumper between O and R on the furnace has been removed, potentially causing low voltage or a brownout condition.

• The O to R link on the furnace has been cut.
• Low voltage condition.
• Incorrect jumper configuration.

Click steps to track your progress.

1. 1

   Restore the R to O link by hard-wiring the R to O terminals on the terminal strip.

2. 2

   Check for correct jumper configuration.

3. 3

   Ensure proper voltage levels are being supplied to the system.