HVAC Sales Master

Fault Code Lookup

HVAC Sales Master
88-15
VFD internal fault - unexpected reset
This code typically points to
  • Loss of reliable PCM-VFD communication
  • Damaged PCM-VFD harness
  • Failed VFD communicating electronics
Next checks to confirm
  1. Check PCM-VFD harness for damage
  2. Replace harness if needed
  3. If harness good and fault persists, replace VFD
Escalation
3 occurrences within 1 hour escalate to 88-55 lockout.
Reset behavior
Retries after 5-minute compressor protection delay.
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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