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33

33 - Faulty outlet thermistor

Rheem · Water Heaters

What does 33 mean?

The thermistor that measures the outgoing hot water temperature is faulty. This can result in incorrect temperature control and potentially unsafe hot water.

Common Causes

  • Defective outlet thermistor
  • Wiring issue to the thermistor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Contact a dealer or qualified service technician to diagnose and replace the faulty thermistor.

  2. 2

    Verify that wiring to the thermistor is secure and undamaged.

Browse all codes in this manual (70)
Verified technical data. Last updated: April 2026

Related Faults

1111 - Gas shut-off valve is not fully open1212 - Gas service interrupted or LP gas low13Hot and cold water lines reversed
Source: Rheem Water Heaters
Open Manual (Page 77)Search more codes in this manual