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T116

T116 - Combustion Health Degraded. Needs Service

Rheem · Water Heaters

What does T116 mean?

The combustion system's performance characteristics are severely degraded. The system needs inspection and servicing.

Common Causes

  • Severely degraded combustion system performance
  • Significant airflow issues
  • Fuel delivery problems

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Press the clear button to clear the error code.

  2. 2

    Refer to the use and care manual for troubleshooting.

  3. 3

    Contact technical support or a service provider for assistance.

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 46)Search more codes in this manual