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Navien - CH-240 Low pressure on heating side

CSmith
CSmith Member Posts: 1
in THE MAIN WALL
Navien CH-240 used as water heater and floor heating. No issues for a year, for no apparent reason the unit showed error code E002 and a pressure reading of 7.x. Manual reads to turn off the system and turn unit back on. This did not fix the problem. Local technician connected a line from the heating water side to the domestic water inlet, this increased the tank pressure to allow the unit to work.

6 weeks later, the same event happened. I applied the same corrective action to allow the system to work.

Why is the system not maintaining tank pressure?

Comments

  • Ironman
    Ironman Member Posts: 7,623
    Because...there's a leak somewhere.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • hotwaterheat
    hotwaterheat Member Posts: 2
    It's not a leak. It's the pressure sensor. They have a pin sized inlet and get jammed up with crud easily.

    Pull the sensor and clean it or replace it. Will make your errors go away.
    njtommy

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