Fault Code Lookup

HVAC Sales Master
Red communications LED 1 flash
Communications failure
This code typically points to
  • Unknown packet received
  • Communications failure

Next checks to confirm
  1. Depress LEARN button
  2. Verify wiring connection

Escalation
Active network problem
Reset behavior
Reset network using LEARN button, approximately 5 seconds.
Urgent
Fix now
Source
Daikin Fit Outdoor Unit Installation Manual 3P515859-5S, network troubleshooting LED table and LEARN-button note, p.38