Navien Combi Boiler: Change gas type with DIP switch 2
Change gas type with DIP switch 2 on a Navien combi boiler: DIP switch 2 #1 sets natural gas or propane and must match the rating plate and the Start-up Wizard.
Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H
How to fix change gas type with dip switch 2: step by step
- Turn power off before removing the front cover.
- DIP switch 2, #1: OFF = natural gas, ON = propane.
- A gas type that does not match the rating plate can show E773/E788.
If the unit shows an error code, look it up: Navien Combi Boiler codes
Models
NCB-190/060HNCB-190/080HNCB-240/110HNCB-240/130HNCB-250/150H
Source: Navien NCB-H Installation & Operation Manual, 6.2 DIP Switch 2, p.76-77. 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.