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  1. H

    Diagnosing problems with NPE 240A recirculation

    Breplum have you found the check valves available now an improvement or just as failure prone pics are from 2017 240a
  2. H

    Navien 240a recirculation

    Referring to the Harry Doyle string started on November 2nd I have completed the repair of the Navien 240A. The check valve came out in pieces and the plunger oring had swelled and the plunger was on the other side of its seat. So when the circ pump went on it forced the plunger to close off...
  3. H

    Navien 240a recirculation

    Since I've got 2 240a's in the house and there's only 2 people (kids grown up) in the house, we have the other one to use so eventually I will work on the 1 we've been talking about. It'll be interesting to see if the check valve is involved in this diagnosis since its between pump and flow...
  4. H

    Navien 240a recirculation

    Thank you. I do feel pump vibration when in test mode as it goes on and off, don't know if that means it's OK. You mentioned motor. Is the pump 2 separate parts, i.e. motor and impeller?
  5. H

    Navien 240a recirculation

    Have 2 navien 240a. On one the recirc system not working. (It does eventually heat up and run normally) All thermistors ohm out at specified temperatures. I know flow valve works cause when in regular mode and open successive faucets gpm increases and responds appropriately to opening/closing...
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