HVACopediaRinnai · Tankless water heater
LPG Initial setting: propane (LPG)
What the display is showing
Shown on the controller of RX/CX units during first-time setup when propane is selected with the Up or Down button. Confirming it stores propane as the gas type. If LPG is chosen, the supplied conversion label goes on the unit's left side, in free space over the original label.
Applies to: Rinnai SENSEI RX/CX tankless (RX, RXP, CX, CXP)
What to do
- From the nG screen press Up or Down LPG appears.
- Press On/Off to confirm propane.
Settings for these units
RX supply connection sizes · SENSEI RX/CX
| Connection | Size |
|---|---|
| Gas | 3/4 in. MNPT |
| Cold inlet | 3/4 in. MNPT |
| Hot outlet | 3/4 in. MNPT |
| Condensate drain | 1/2 in. MNPT |
Vent connection: 2 in. nominal PVC/CPVC/PP or 3 in./5 in. concentric.
Full specs (input, flow, weight) are only on each model's spec sheet, not in this manual.
RX water quality limits · SENSEI RX/CX
| Contaminant | Maximum level |
|---|---|
| Total hardness | Up to 200 mg/L |
| Aluminum | Up to 0.2 mg/L |
| Chlorides | Up to 250 mg/L |
| Copper | Up to 1.0 mg/L |
| Dissolved CO2 | Up to 15.0 mg/L |
| Iron | Up to 0.3 mg/L |
| Manganese | Up to 0.05 mg/L |
| pH | 6.5 to 8.5 |
| TDS | Up to 500 mg/L |
| Zinc | Up to 5 mg/L |
Water damage beyond these limits is not covered by warranty.
- RX water treatment and flushing by hardness · SENSEI RX/CX
- RX clearances to combustibles · SENSEI RX/CX
- RX temperature settings available · SENSEI RX/CX
Models that show this code
10 models in SENSEI RX/CX
Other codes on the same units
- In Initial setting: indoor installation
- In Use fast flash In Use light rapid flash
- In Use slow flash In Use light slow flash
- In Use solid In Use light steady
- LC Scale build-up in heat exchanger (LC, LC0–LC9, 00)
- Lock key Controller locked (key symbol)
- Mute Controller key beeps on/off
- Out Initial setting: outdoor installation
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Source: Rinnai SENSEI RX Residential Installation and Operation Manual (100000839), 4.12 Initial Settings p.46-47. Summarized in our own words; check the original manual for your model.
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.