Outdoor Unit Not Found (two-stage communicating)

What does OUTDOOR_UNIT_NOT_FOUND mean?

The Evolution Control cannot detect the two-stage communicating outdoor unit. This communication failure stops the outdoor unit from operating.

• Incorrect or loose ABCD wiring to the outdoor unit
• Damaged communication wire
• Outdoor unit control board issue
• Power supply issue to the outdoor unit

Click steps to track your progress.

1. 1

   Recheck all ABCD wiring connections at the outdoor unit's connector.

2. 2

   Ensure all wire colors are correctly matched at each terminal.

3. 3

   Verify that 24VAC power is present between the C and D terminals at the outdoor unit.

4. 4

   Contact an HVAC technician if the unit is not found after checking wiring and power.