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HF

HF — High DC Bus Voltage Fault

Carrier · 38AP Air Handler

What does HF mean?

The line voltage is too high, the deceleration rate is too fast, or there is an overhauling load. Adjust settings or check voltage.

Common Causes

  • Line voltage is too high
  • Deceleration rate is too fast
  • Overhauling load

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the line voltage to ensure it is within the specified range.

  2. 2

    Adjust the deceleration rate setting (Parameter P01) if it is too fast.

  3. 3

    Evaluate if the load is overhauling and adjust settings accordingly.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

A051A051 — Circuit A, Compressor 1 Stuck On Failure AlarmA052A052 — Circuit A, Compressor 2 Stuck On Failure AlarmA053A053 — Circuit A, Compressor 3 Stuck On Failure Alarm
Source: Carrier 38AP Air Handler
Open Manual (Page 154)Search more codes in this manual