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A102

A102 - Ambient temperature sensor failure

Rheem · Air Conditioning

What does A102 mean?

The ambient temperature sensor has failed, meaning the unit cannot accurately read the surrounding air temperature. This can affect heat pump operation.

Common Causes

  • Failed ambient temperature sensor
  • Wiring issue to the sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the sensor and its wiring for any damage.

  2. 2

    Check the connections at the control board.

  3. 3

    Test the sensor's resistance with a multimeter and compare it to the specified Ohm chart.

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 32)Search more codes in this manual