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error Rheem
Error Code Wi-Fi LED red blinking three times followed by pause
Failures involving Wi-Fi connection to router, SSID or password changes.
? What Causes This
Router/network issues affecting communications between device and water heater.
✓ How to Fix It
1. Press the Wi-Fi button (5 seconds) to reset module and retry setup process.
Source: page 23 of the official manual
From the manual
This error code appears in:
Rheem Gladiator Water Heater