HVAC Sales Master

Fault Code Lookup

HVAC Sales Master
86-46
PCM-VFD communication lockout
This code typically points to
  • Persistent PCM-VFD communication failure
  • Failed harness or VFD electronics
Next checks to confirm
  1. Replace PCM-VFD harness
  2. If fault persists after harness replacement, replace VFD
Escalation
Extended lockout condition.
Reset behavior
Lockout condition; clears after VFD/harness replacement.
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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