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7 Fault Code

Fault Code 7 — Al1 LOSS

Carrier · Energy Recovery Ventilators

What does 7 Fault Code mean?

Analog input 1 has lost its signal. The value is less than the set limit.

Common Causes

  • Loss of signal from the analog input 1 source
  • Incorrect parameter settings for AI1 FLT LIMIT or AI<MIN FUNCTION

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the source connected to Analog Input 1.

  2. 2

    Verify the wiring to Analog Input 1 is secure.

  3. 3

    Review and adjust parameter settings for AI1 FLT LIMIT and AI<MIN FUNCTION.

  4. 4

    Reset the VFD after confirming connections and settings.

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

Related Faults

1 Fault CodeFault Code 1 — OVERCURRENT10 Fault CodeFault Code 10 — PANEL LOSS11 Fault Code11 Fault Code — ID RUN FAIL
Source: Carrier Energy Recovery Ventilators
Open Manual (Page 126)Search more codes in this manual