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Grundfos Alpha stopped running with display flashing

Has anyone had this problem before?

Often wrong, never in doubt.

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Comments

  • hot_rodhot_rod Member Posts: 12,954
    check installed? I've seen them do that when they are either being spun backwards or have flow when un-powered from another cir, for example.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • Alan (California Radiant) ForbesAlan (California Radiant) Forbes Member Posts: 2,154
    edited March 26
    This was during a call for heat. The system was installed 10 years ago and it's just now acting up. (I didn't know the Alpa's have been around that long.)

    Don't know about a check, but there seems to be gravity flow.
    Often wrong, never in doubt.

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  • hot_rodhot_rod Member Posts: 12,954
    Odd that it would just now start if it was a mis-pipe. Maybe it fried form over-voltage or something. Try Osborne Sales the local rep for some answers.

    Alphas are built in Fresno, maybe 15 years now? We are getting old :(
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • HomerJSmithHomerJSmith Member Posts: 844
    edited March 26
    Did you try to unpower it and repower it? leave it off for a few minutes.

    This is a circuit board problem. I guess the polarity and voltage of the outlet that the pump is plugged into is correct.
  • "Did you try to unpower it and repower it? leave it off for a few minutes."

    Yes, kept on flashing.

    I'm going there tomorrow and will let you know what I find.
    Often wrong, never in doubt.

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  • Robert O'BrienRobert O'Brien Member Posts: 3,174
    Bring a new one. Been there,done that.
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  • SteamheadSteamhead Member Posts: 13,676
    Bet the shaft has gotten stuck and won't turn. That happened to us once.
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Baltimore, MD (USA) and consulting anywhere.
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    HomerJSmith
  • Steamhead said:

    Bet the shaft has gotten stuck and won't turn. That happened to us once.

    I've never known you to be wrong. :D
    Often wrong, never in doubt.

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    kcopp
  • We replaced the motor this morning. The old impeller spun freely. I think the electronics went bad.
    Often wrong, never in doubt.

    Click here to learn more about this contractor.
    kcopp
  • HomerJSmithHomerJSmith Member Posts: 844
    I've never done this. I like to know why thing fail. I've taken apart many devices to understand the "why".

    I would pry off the label and look for screws under the label that fasten the black electronic control to the pump housing. I would look at the control circuitry and look to see if it is plugged into the pump windings and that the control board is making good contact. Is anything looking burnt? Possibly a power surge.

    I always plug the new boilers and ECM pumps into a computer grade surge protector.
    kcopp
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