Navien Tankless Water Heater: Open the R&D information menu (key sequence)
Open the R&D information menu (key sequence) on a Navien tankless water heater: Hidden menu with 1 Technical Information and 2 Parameter Information (2.PAR); it returns to the menu after 5 minutes without key input.
Applies to: NPN-160U/180U/199U, NPN-120E/160E/180E/199E
How to fix open the r&d information menu (key sequence): step by step
- Press Power to turn the heater off.
- Press Up (+) 3 times, Down (-) 3 times, then Up (+) 4 times.
- Use Up/Down to choose 2.PAR, press Info.
- Reset goes back one level.
If the unit shows an error code, look it up: Navien Tankless Water Heater codes
Models
NPN-120ENPN-160ENPN-160UNPN-180ENPN-180UNPN-199ENPN-199U
Source: Navien NPN-U/NPN-E Installation Manual, 3.4.3 Adjusting the Recirculation Parameters, p.28. 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.