Navien Tankless Water Heater: Change gas type with the front panel DIP switch
Change gas type with the front panel DIP switch on a Navien tankless water heater: Front panel DIP switch 1 selects natural gas or propane; use it only after a gas conversion.
Applies to: Navien NPE-A2 (built-in recirculation) and NPE-S2 condensing tankless water heaters: NPE-150S2, NPE-180A2/S2, NPE-210A2/S2, NPE-240A2/S2
How to fix change gas type with the front panel dip switch: step by step
- Turn power off before changing DIP switches.
- Switch 1: OFF = natural gas (factory), ON = propane.
- Change it only after a gas conversion with the Navien kit; the unit shows E788 until the gas type is confirmed in the Start-Up Wizard.
If the unit shows an error code, look it up: Navien Tankless Water Heater codes
Models
NPE-150S2NPE-180A2NPE-180S2NPE-210A2NPE-210S2NPE-240A2NPE-240S2
Source: Navien NPE-A2/S2 Installation Manual, 3.8 Setting the DIP Switches, p.19, p.61; 8.1 p.112. 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.