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A127

A127 - Element wire routing error

Rheem · Air Conditioning

What does A127 mean?

The heating elements may be mis-wired, or the control board may have failed. This has disabled the heater, and electrical connections need to be checked.

Common Causes

  • Incorrect wiring of heating elements
  • Control board failure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the power to the unit.

  2. 2

    Inspect the wiring connections at the heating element.

  3. 3

    Ensure wires are correctly connected at both the element and the control board.

  4. 4

    Check the heating element's resistance if wiring is confirmed correct. Replace the board if resistance is good, or the element if resistance is bad.

Browse all codes in this manual (48)
Verified technical data. Last updated: April 2026

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Source: Rheem Air Conditioning
Open Manual (Page 33)Search more codes in this manual