Fault Code Lookup

HVAC Sales Master
D4 / Ed4
Memory-card data has been rejected
This code typically points to
  • Shared data on memory card has been rejected

Next checks to confirm
  1. Verify shared data is correct for the specific model
  2. Repopulate data if required

Escalation
Communicating setup/data fault
Reset behavior
Clears after valid memory-card data is accepted.
Urgent
Fix now
Source
Daikin Fit Outdoor Unit Installation Manual 3P515859-5S, troubleshooting table, p.37