Navien Error Code 001 After Replacing Water Pressure Sensor

[CM3939]

Hello,

My Navien combi boiler was not giving hot water and the PSI on the system was showing zero. I drained the tank and replaced the water pressure sensor which fixed the issue. When I turned the water back on rebooted the system it quickly became too hot (above 200 degrees) and shut down with the 001 code. I'm able to hear a whooshing noise for a few minutes after it shuts off which sounds like it may be coming from the pump.

Any ideas here? The water inlet filter is clean and I just descaled the system a couple months ago. Seems like too much of a coincidence that this happens immediately after replacing the WPS so I hesitate to think it could be the pump or board.

Any help would be appreciated.

Thanks!

 

[Fitter30]

Navien Tankless Water Heater Error Code E001: Troubleshooting and Solutions

Navien is a well-known brand for its high-quality tankless water heaters. However, like any other appliance, Navien tankless water heaters can experience

www.google.com

Hope that the overheating didn't compromise the heat exchanger. Complete model number of unit?

 

[Sponsor]

 

[CM3939]

Navien Tankless Water Heater Error Code E001: Troubleshooting and Solutions

Navien is a well-known brand for its high-quality tankless water heaters. However, like any other appliance, Navien tankless water heaters can experience

www.google.com

Hope that the overheating didn't compromise the heat exchanger. Complete model number of unit?

NCB-240

Thanks for any insight here.

 

[Fitter30]

Turn the gas off to it see if the gpm has a read out under E of basic info time water going into bucket see if it's fairly close and in and out water temps should be within a couple of degrees.

 

[CM3939]

I ran the water with the gas off and bled the air from the pump and it seems like it fixed it. Maybe I just needed to push some water through to help force the air out? Either way it seems like it worked and I really appreciate the advice.

Thanks and have a great 4th!