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A122

A122 - Shutoff valve inputs in error

Rheem · Air Conditioning

What does A122 mean?

There is an error with the input signals related to the shutoff valve. This suggests a communication or configuration problem with the valve.

Common Causes

  • Incorrect shutoff valve wiring
  • Control board issue

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify that the shutoff valve is correctly wired.

  2. 2

    Reset the shutoff valve by unplugging and plugging it back in.

  3. 3

    If the problem persists, contact customer service.

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

Related Faults

1 beep1 beep - WiFi Soft Reset initiated3 beeps3 beeps - WiFi Hard Reset initiated3 red flashes3 red flashes — Communication error
Source: Rheem Air Conditioning
Open Manual (Page 33)Search more codes in this manual