Navien Combi Boiler: Force a fixed firing rate with DIP switch 1
Force a fixed firing rate with DIP switch 1 on a Navien combi boiler: Switches 1 and 2 of the first DIP bank hold the burner at minimum or maximum for testing; leave them OFF/OFF for normal operation.
Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H
How to fix force a fixed firing rate with dip switch 1: step by step
- Turn power off before removing the front cover to reach the DIP switches.
- 1 ON, 2 OFF = 2-stage MAX.
- 1 OFF, 2 ON = 1-stage MIN.
- 1 ON, 2 ON = 1-stage MAX.
- Return 1 and 2 to OFF/OFF for normal operation.
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, 6.1 DIP Switch 1, p.76. 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.