Fault Code Lookup

HVAC Sales Master

88-73

DC link sensor lockout

This code typically points to

Failed internal DC-voltage measurement in VFD
Damaged VFD electronics

Next checks to confirm

Manual power cycle at disconnect
Replace VFD if malfunction persists

Escalation

4-hour lockout.

Reset behavior

4-hour lockout. Carrier/Bryant say malfunction unlikely to go away once set.

Urgent

Fix now

Need deeper detail?

Retrieve the subcode for this platform:

From the main screen, touch Menu
Touch and hold the Service icon for at least 10 seconds until it turns green
Open Service Information
Use View Diagnostics for the most recent fault's top three likely root causes
Use Last 10 System Events for timestamped recent events
Use Run/Fault History for resettable fault counters, cycle counters, and run times

Source

186CNV/284ANV service manual

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