HVAC Sales Master

Fault Code Lookup

HVAC Sales Master
88-78
Internal DC discharge lockout
This code typically points to
  • Internal VFD DC discharge / short-to-ground failure
  • Damaged VFD power section
Next checks to confirm
  1. Manual power cycle at disconnect
  2. Replace VFD if malfunction persists
Escalation
4-hour lockout.
Reset behavior
4-hour lockout. VFD attempts automatic reset; persistent fault escalates.
Urgent
Fix now
Need deeper detail?
Retrieve the subcode for this platform:
  1. From the main screen, touch Menu
  2. Touch and hold the Service icon for at least 10 seconds until it turns green
  3. Open Service Information
  4. Use View Diagnostics for the most recent fault's top three likely root causes
  5. Use Last 10 System Events for timestamped recent events
  6. Use Run/Fault History for resettable fault counters, cycle counters, and run times
Source
186CNV/284ANV service manual
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