Navien Tankless Water Heater: Adjust recirculation parameters P12, P14, P15
Adjust recirculation parameters P12, P14, P15 on a Navien tankless water heater: Recirculation pump cycle, sampling time and differential OFF temperature are set in the R&D menu.
Applies to: Navien NPN non-condensing tankless water heaters: NPN-160U/180U/199U (universal, indoor or outdoor with vent kit) and NPN-120E/160E/180E/199E (outdoor only)
How to fix adjust recirculation parameters p12, p14, p15: step by step
- Turn the unit off, press Up 3 times, Down 3 times, Up 4 times.
- Choose 2.PAR and press Info.
- Press Info to edit and use +/- to change; the value sends after Info or 10 s without input.
- Reset returns to the previous menu.
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, 3.4.2-3.4.3, p.26-29. 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.