Navien Combi Boiler: Run test mode (fan, pumps, valves, venturi)

Run test mode (fan, pumps, valves, venturi) on a Navien combi boiler: Test mode switches individual outputs so you can check them one at a time.

Homeowner with a combi boiler problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: NCB-250/150H, NCB-240/130H, NCB-240/110H, NCB-190/080H, NCB-190/060H

How to fix run test mode (fan, pumps, valves, venturi): step by step

1. Hold Back and Menu together for 3 seconds and choose 6. Test Mode.
2. Fan Motor ramps the fan up to top speed and back down.
3. 2-5. Boiler / Zone 1-3 pumps toggle on/off (zone pumps only in pump system).
4. 6-8. Zone 1-3 valve output toggles (zone valve system only).
5. 3 Way Valve Output toggles the 3-way valve.
6. Flow Control Valve / 11. Mixing Valve drive open-closed-back and show FEEDBACK.
7. Dual Venturi / 13. Recirc. Pump toggle on/off.

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