Question about Grundfos MQ3-35 3/4 HP Pressure Booster Pump
Is it newly installed or has it been working for a while till you noticed it?
Posted on Jan 16, 2014
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
This is a problem with your bladder in the pressure tank or the pressure switch. Ether one will produce this cycling on and off. Good luck.
Posted on Mar 09, 2010
I have the same problem and have found that the inlet check valve has a broken shaft in the center of device. It is a multi-piece plastic unit and it looks as if it is not quite seating and therefore the internal pressure leaks slowly back into my low pressure suction line. The pump will start and the pressure will build then shut off for about 30 minutes then cycle again. I am going to replace the check valve.
Posted on Apr 18, 2010
This sounds like a issue with air still being in the system and not being removed from the system to make things work properly. I did try to findthere number and was unable to locate it. The only other option for you is to return the product and find one with better support
Posted on May 04, 2010
SOURCE: Grundfos pump leaking?
If it is starting and stopping, it most likely does have some type of leak. The check vavlve is normally installed on the suction side of the pump, and sometimes instead of a check vavlve or in addition to, there is a foot valve. A foot valve is just a check valve (usually with a screen) at the end of the line in the bottom of the cistern. If you have much suction lift, and the check valve leaks (or any leak in the suction piping) then the water will drop back into the cistern. This will also cause the discharge side of the pump system to drop in pressure, causing the pump to restart. You mentioned removeing the pressure tank, that tank keeps the pump from short cycling when you have low demand on the system. If the pump is higher than the cistern, and you don't see a check valve between cistern and pump then you most likely have a foot vavle in the cistern. Hopefully it's accessable by removing the pipe.
Posted on Aug 01, 2010
Tips for a great answer:
Apr 14, 2014 | Grundfos Pumps Grundfos MQ 3-45 1 HP...
Feb 07, 2014 | Garden
Nov 04, 2012 | Grundfos Pumps Grundfos MQ 3-45 1 HP...
Nov 17, 2011 | Grundfos MQ3-35 3/4 HP Pressure Booster...
Jan 02, 2011 | Grundfos JPS4 1 HP Pressure Booster Pump
Aug 01, 2010 | Grundfos MQ3-45 1 HP Pressure Booster...
May 04, 2010 | Grundfos MQ3-35 3/4 HP Pressure Booster...
Mar 09, 2010 | Grundfos MQ3-35 3/4 HP Pressure Booster...
Mar 06, 2010 | Grundfos MQ3-35 3/4 HP Pressure Booster...
956 people viewed this question
Usually answered in minutes!