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The problem is solved after change a Thermal Fuse. Thank you so much for your help.

Update Today i try to unstand the error code from what Sensors.I knew the Heater Shoutdown abnormal and gave Error code should control by one or more sensor.I test sensor which related. one by one disconnect and Connect it.I Found out the Error Code is from Thermal Fuse when i disconnet it will...

I use endoscope to check inside Burner It look clean. Are there fuel residue accumulates? When it burn you can see much red point inside.

The water looks very clear after sevel times testing. I remember Fist time change water is very Black and oil and stinks. Navien NBC190 not allow to Flushing Heat Space . Some one said because the 3 way Valve Stop water go out. I was tryed Flush it but no water comes out from Supply .but i Found...

Do you know how to flush the Heat Space Exchanger? I was try to Flush but no Water comes out from Supply .DHW is working.

Do you know hwo to flush the Heat Space Exchanger? I was try to Flush but no Water comes out from Supply .DHW is working.

Navien Not support end user They don't answer my qustion.I am not license Plumber but i did Plumber worker and Electric many years. I talk to the License Installer they are very expensive i Can't afforable that. $300 for the diagnostic One hour $200 for install not including Part fee. I afraid...

Yes i took pictures when it stop working.How do i check the APS? Every things works fine after 5-10 minutes will overheating Error 031 I checked the exhaust Temperature rise very quickly when the DHW useing 1 Min it will up to 122 F but not reach 149. Is it abnormal？

Thank you for your Feebback .Air Inlet Filter is clear The Exhaust is 122 and DHW Flow rate is Around 4.LPM when using DHW the SH Flow Rate is show Calculating。Water pressure 13.psi. The Flow control Valve status is 68% and Mixing Valve status is 2%. When the DHW working the Flow Control Never...

The water pressure Solved by change a new water pressure.But the problem still have. I have changed Hight limit Switch and Exhauste Sensor.Checked the fan and Damper every things is good.Is it the problem from Heat Exchange? Someone told me Change PCB is it works?

I am use Test mode for all test and found Flow Control Valve 0% Feedback Mix Valve 50% Feedback Is that abnormal? I check the Status Information of DHW Flow show 4.5LPM is that same Flow control?

Thank you so much for your feedback. I am living a Condon the water heater is on the same Floor. I just fixed the pressure problem from changed a water pressure sensor. Now the pressure comes to normal 12Psi.but the problem still have I am no idea not parts have the problem .is it 3 way valve or...

Modle:NCB-190060H(NG) I am new owner with this Condon. I thinks the heater is purchased 2-3 year ago. I got a problem with Space heat when I turn on space heat the Boiler will run 5-10 second and pop out Error 031-00 Overheating of burner check Burner. the pressure is 15psi when the heat start...