Navien Tankless Water Heater: Lock the temperature setting (commercial lock, DIP switch 7)
Lock the temperature setting (commercial lock, DIP switch 7) on a Navien tankless water heater: DIP switch 7 stops users changing the set temperature.
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 lock the temperature setting (commercial lock, dip switch 7): step by step
- Switch 7: OFF = temperature can be set, ON = temperature cannot be set.
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, 3.7 Setting the DIP Switches, p.19, p.48-49. 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.