Rinnai Tankless Water Heater: Show the last 9 stored codes (diagnostic history)
Show the last 9 stored codes (diagnostic history) on a Rinnai tankless water heater: The controller plays back the nine most recent maintenance codes one after another. LC shows as 00 in this list.
Applies to: SENSEI RX and CX series tankless
How to fix show the last 9 stored codes (diagnostic history): step by step
- Switch the heater off with On/Off
- Hold On/Off 2 s, then press the up arrow while still holding
- The codes flash in sequence
- Repeat the same hold to leave, then switch back on
If the unit shows an error code, look it up: Rinnai Tankless Water Heater codes
Source: Rinnai SENSEI RX technical guide (en-CA), Diagnostic history. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.