HVAC Sales Master

Fault Code Lookup

HVAC Sales Master
38-18
High differential pressure start disable
This code typically points to
  • High standing pressure differential preventing safe compressor start
  • System not equalized
  • PEV issue
Next checks to confirm
  1. Verify PEV operation
  2. Allow system to equalize
  3. Verify refrigerant charge and standing pressures
Escalation
Investigate PEV or system refrigerant issues if persistent.
Reset behavior
Clears when pressures equalize for safe start.
Service Soon
Schedule repair
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
Carrier inverter service manual
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