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Er

Er — Invalid Data or Command

Carrier · 38AP Air Handler

What does Er mean?

Invalid data has been entered, or an invalid command was attempted. This indicates a user input error.

Common Causes

  • Invalid data entered
  • Invalid command attempted

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Review the data that was entered and ensure it is valid for the system.

  2. 2

    Check the command that was attempted and verify it is a supported command.

  3. 3

    Re-enter the data or command carefully.

  4. 4

    If the error persists, consider performing a system reset.

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