mq3-45b

  1. D

    Grundfos MQ 3-35: Short Cycling Issue – Flow Sensor & Control Unit Replaced, Problem Persists – Suggestions?

    Hi all, I’ve been going through various topics here but haven’t found an exact match for the issue I’m experiencing. My pump has started short cycling. After reading through some similar cases, I’ve tried a few solutions, but the problem persists. Here’s what’s happening: When I open a...
  2. Noke

    Grundfos MQ3-45 B Pump Cycling

    Hello everyone, I purchased a house that had a MQ3-45B pump installed in line with the main city water. Within the last few months I have noticed that pumps cycles on and off repeatedly, but it doesn't do it every time. I believe I have narrowed it down to the cycling occurring after small...
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