Fault Code Lookup

HVAC Sales Master
d4
Invalid memory-card data
This code typically points to
  • Shared data set on memory card rejected by integrated control module

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

Escalation
Operation different than expected or no operation until valid shared data is accepted
Reset behavior
Error clears once valid data is loaded and power is cycled per procedure.
Urgent
Fix now
Source
DC96VC/DM96VC Service Instructions troubleshooting chart, p.48