Navien Boiler Error Code

[swaniriver]

I thought I would try here before calling the pros. I have a Navien NHB 55 running my floor heat in garage. It's on its third season. Yesterday it showed a red wrench with error code 271.

"Temperature Differential Limit" it gives no definitions of what that means or solutions in the manual and I cannot find anything on the web. I have it setup using the outdoor reset and it has been flawless. It is still working but I am guessing it is mad about something.

Any body have experience with this issue?

 

[gmcgeo]

Check if the vent pipe is clogged with debris. possible a bird got in the vent

Check if capacity of the circulation
pump(external) is enough to circulate water in
pipe

 

[TurnipTruck]

Your error message may refer to the boiler input vs output temp delta is too small (no water?)or too large (bad pump?) or reversed (bad sensor?).

 

[Jackfre]

Navies has very good tech service. Try them out.

 

[fitter30]

Heres a service manual page 111. This is a safe site

NAVIEN NHB-055 INSTALLATION & OPERATION MANUAL Pdf Download

View and Download Navien NHB-055 installation & operation manual online. condensing boiler. NHB-055 boiler pdf manual download. Also for: Nhb-080, Nhb-150, Nhb-110, Nhb series, Nhb-55, Nhb-80.

www.manualslib.com

 

[boilerzach]

delta limit means the difference between your supply and return is to high. would generally mean no flow check your pump

 

[swaniriver]

Thanks for all the replies! The boiler's settings got out of whack. Which had the outgoing temp too high. Not sure how exactly that happened. But I did learn from navien that my taco007e pump on the boiler side is not recommended. Need to replace with and nfr-25.

Once correct settings were put in error code went away. Gonna switch pumps out this weekend. I guess I'll have a spare for the other pump in the system.