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T504

T504 - Wifi Chip Communication Error

Rheem · Water Heaters

What does T504 mean?

This error indicates a timing issue with the WiFi chip's communication. It does not necessarily mean the chip has failed.

Common Causes

  • Temporary WiFi communication glitch
  • Interference with WiFi signal

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to the use and care manual for information on WiFi troubleshooting.

  2. 2

    Restart the water heater and your WiFi router.

  3. 3

    Contact technical support or a service provider if the issue persists.

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 47)Search more codes in this manual