Navien Combi Boiler: Hot water is cold or turns cold – Navien NCB-H

Hot water is cold or turns cold - Navien NCB-H on a Navien combi boiler: Water at the tap stays cold or goes cold during a draw.

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

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

Common causes of hot water is cold or turns cold - navien ncb-h

• Draw below the 0.5 GPM needed to start DHW
• Active error code
• Clogged inlet filter

How to fix hot water is cold or turns cold - navien ncb-h: step by step

1. Open the tap wider - the boiler needs at least 0.5 GPM to detect a DHW demand.
2. Check the front panel for an error code and look it up.
3. Clean the DHW cold inlet filter.
4. Check Status Information > 15. DHW Flow while the tap is open.

If the unit shows an error code, look it up: Navien Combi Boiler codes

Models

Navien NCB-H

NCB-190/060HNCB-190/080HNCB-240/110HNCB-240/130HNCB-250/150H

Navien NFC-H

NFC-250/175HNFC-250/200H