Question about Grundfos MQ3-45 1 HP Pressure Booster Pump

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My pump turns on when I open a faucet; pumps perfectly for exactly 13-seconds, then stops for two seconds, then pumps again for 13-seconds; then stops for two seconds, then pumps again...indefinitely. What can I do to fix the problem?

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  • Leo MacCanna Jan 02, 2012

    I have exactly this problem. How do you increase screw in pressure regulator?

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Sounds like high pressure stop. increase screw in pressure regulator. or use more water.

Posted on Feb 08, 2010

  • jaap schildmeijer Feb 10, 2010

    can also be air in the pump.
    then it cannot reach its switch off pressure and the electronics will stop the pump and start it up again.

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There are only a couple of conditions that will cause an MQ to cut out, those being: full pressure being reached, a dry run condition (takes 30 secs to occur) or a voltage issue/ overload. The pump may be coming up to pressure and shutting down only to find the pressure drop and need to start again, very common on low flow conditions. Is the suction check valve in place?

Posted on May 18, 2010

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Replace control unit or bypass control with a normal pump pressure switch..I recomend the bypass..it works and I had to replace the control unit twice in two years..nor no problem..

Posted on Jan 14, 2012

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Did you find soloution yet

Posted on Oct 11, 2011

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Posted on Jan 02, 2017

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Ok, so I had the exact same problem with the exact same model. NOT 7 blinks and to buttons that you do not have.
I will tell you what I did as I do not know what (if any) of what I did fixed it (it could be luck but I do not think so).

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Culligan RO sstem has recently stopped producing more that 6 oz


This might be a possible tank pressure issue. This could also be a clogged filter. I would first check the tank pressure by using the following steps

Necessary Supplies:
1) Tire Gauge marked in 5psi increments (ie 5, 10, 15, 20psi, etc.)
2) Bicycle tire pump for standard type bike tire valve

To recharge RO System Tank:

1) Close cold water feed valve (valve located at some point along the cold water line from street plumbing).*
2) Leaving RO tank valve on, turn tank on side & locate valve stem on bottom side.
3) Remove stem cap.
4) Drain all water out of tank through open RO faucet into sink. (Continue to leave RO faucet open throughout procedure)
5) If current tank pressure is insufficient to empty tank, apply tire pump to valve stem and pump 10 – 15 times. Exit flow will increase and then gradually decrease as pressure equalizes. Do not overcharge internal bladder of tank during this procedure.
6) Repeat step #4 until tank is completely empty. (Tank is empty when additional pumping produces no more water)
7) At this point, adjust EMPTY tank to exactly 7psi. (Gauge reading midway between 5 & 10psi is sufficient)
8) Turn off RO faucet.
9) Replace cap on valve stem and reposition tank in upright position.
10) Open cold water feed valve.*
11) System water is useable immediately, however, tank will take 3-4 hrs to completely refill.

FreshWaterSystems.com: The Water Super Store: 1-877-335-3339

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1 Answer

''no water''


I too had the same problem as you with my pipes freezing, but my heat was the culprit. Basicly the problem was the same. I turned the water on in the sink and when the water thawed there the pump started and oh my god I had broken water pipes in the house under the counter, so I turned the main water valve off, or the pump from the breaker box for the well. The difference is that if you turn the well pump off then the water runs until the pressure goes down. If you turn the main water off it will stop sooner. I fixed the pipes under the sink and behind the dishwasher started to leak, Fixed that and again turned on the water again at the main valve. Ask where your main water lever is. My water started to run in the sink area, but the drains were frozen, I put a heater under the house and heated up the pvc pipe that was still frozen. Of course the toilet..... When it got alittle warmer and the heat on the pipe, things broke loose. The plumber was no where to be found because they were so busy, this worked for me and people had great ideas for me to try. When the water and the pump were turned back on all leaks were fixed and things are back to normal. I am now wiser...I hope this story helps somewhat.

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Water pump Question


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