Fault Code Lookup

HVAC Sales Master
CONTINUOUS OFF
No control power indicated; check line and secondary power
This code typically points to
  • No 115 VAC to L1/L2
  • No 24 VAC at SEC-1/SEC-2
  • Open door switch
  • Failed transformer
  • Failed board

Next checks to confirm
  1. Verify 115 VAC at L1/L2
  2. Verify 24 VAC at SEC-1/SEC-2
  3. Inspect interlock/transformer/board

Escalation
If both line and secondary voltage are present and LED remains off, control failure becomes likely.
Reset behavior
Not a timed lockout; clears when power is restored.
Urgent
Fix now
Source
Carrier 58-06T service/status code instructions