bonbon
New Member
Hi, there,
There is a Navien NCB-240E installed in my house one year ago. Recently, in the summer, error code E351 happened once, then I open the auto feed valve to make up some water, the unit works again. But the problem came again in two weeks.
I found the pressure drops 1psi everyday, but not in daytime. It drops overnight. I did not see any leaking in my system. I have two zones in my house. I closed two supply valves and two return valves to make the closed loop by the unit itself. However, the pressure still drops. So, that means the Combi is leaking somewhere.
But, I still could not find any leaking around the unit. I think maybe the water pressure relief is faulty. I am not sure. BTW, the water pressure goes 38PSI and the 30psi PRV is warm and the pipe drips some water to the floor drainage when I turn on the domestic hot water. Is it normal?
Thanks for your help first.
There is a Navien NCB-240E installed in my house one year ago. Recently, in the summer, error code E351 happened once, then I open the auto feed valve to make up some water, the unit works again. But the problem came again in two weeks.
I found the pressure drops 1psi everyday, but not in daytime. It drops overnight. I did not see any leaking in my system. I have two zones in my house. I closed two supply valves and two return valves to make the closed loop by the unit itself. However, the pressure still drops. So, that means the Combi is leaking somewhere.
But, I still could not find any leaking around the unit. I think maybe the water pressure relief is faulty. I am not sure. BTW, the water pressure goes 38PSI and the 30psi PRV is warm and the pipe drips some water to the floor drainage when I turn on the domestic hot water. Is it normal?
Thanks for your help first.