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Rinnai · Tankless water heater

SEt Initial settings not yet confirmed

Low severity SENSEI RX/CX

What the control is telling you

Shown on first power-up of a SENSEI RX/CX unit, which ships configured for natural gas and indoor installation. The installer must confirm or change the initial settings before the heater is used.

Applies to: SENSEI RX/CX series only

Likely causes

  • Unit powered up for the first time
  • Factory default settings (natural gas, indoor) not yet confirmed by the installer
  • Initial settings need to be changed to match the actual installation

Test and repair steps

  1. Warning: Using the heater before the correct initial settings are selected creates a hazard that can cause injury or property damage. Only a trained, qualified professional should do the initial setup.
  2. Option 1 (recommended) confirm or change the initial settings from a smart device over Bluetooth Low Energy (BLE).
  3. Option 2 confirm or change the initial settings using the water heater's controller.
  4. See the "Initial Settings" section of installation manual 100000839 or 100000840 for full details.

Settings for these units

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Source: Rinnai Troubleshooting TWH Diagnostic Codes (100000652), p.5. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.