E201 — Indoor/outdoor communication error (Pre-tracking failure or unit quantity mismatch)

What does E201 mean?

There is a communication error between the indoor and outdoor units, either during initial setup (pre-tracking) or because the actual number of indoor units differs from the outdoor unit's quantity setting.

• Communication tracking failure after initial power supply
• Incorrect indoor unit quantity setting in the outdoor unit
• Wiring or connection issues between indoor and outdoor units

Click steps to track your progress.

1. 1

   Power off the entire system at the main circuit breaker for 30 seconds, then power it back on.

2. 2

   Verify that the communication wiring between the indoor and outdoor units is correct and secure.

3. 3

   Consult a qualified installer to check the indoor unit quantity setting programmed into the outdoor unit.