Settings shortcuts: Combi Boiler tips

Short, practical technician tips on settings shortcuts for combi boiler. Check each one against the manual for your exact model before acting.

Show fan frequency on the display (parameter 22)

FlowMax · FLOWMAX-120 condensing combi

Setting parameter 22 to 01 makes the display show the fan frequency for 10 minutes while the unit runs.

1. Enter the parameter menu (PL 0).
2. Select parameter 22 and set it to 01 (00 = off).
3. Confirm with S, then switch the unit off and on.
4. While the unit runs, the display shows the fan frequency for 10 minutes.

Change gas type with DIP switch 2

Navien · NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

DIP switch 2 #1 sets natural gas or propane and must match the rating plate and the Start-up Wizard.

1. Turn power off before removing the front cover.
2. DIP switch 2, #1: OFF = natural gas, ON = propane.
3. A gas type that does not match the rating plate can show E773/E788.

Set the altitude with DIP switch 2

Navien · NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

DIP switch 2 #2 and #3 select the altitude band.

1. 0-1,999 ft: 2 OFF, 3 OFF.
2. 2,000-5,399 ft: 2 ON, 3 OFF.
3. 5,400-7,699 ft: 2 OFF, 3 ON.
4. 7,700-10,100 ft: 2 ON, 3 ON.