I have a problem with mq booster pump every 10 seconds kicks back and kicks on i am check the showers no leaks everything is ok please tell what can be a problem

google Grundfos MQ3-45 check valve for more sites

copy and paste
https://rainwaterequipment.com/non-return-valve-for-grundfos-mq-3-45-or-mq-3-35-booster-pump/

https://www.pumpproducts.com/grundfos-96526663-non-return-valve-for-mq-booster-pumps.html



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Right after the discharge outlet, a non-return valve or check valve is usually installed. Check this one out, maybe it is worn out. You may have to replace it. Do this and get back to me if it does not work out.

Check the mechanical seal.

Is it newly installed or has it been working for a while till you noticed it?

Paul. Is it only the shower that the pump cuts out? i dont think we have these pumps in AU. Would bet that its a flow issue. Either remove the water saving device in the shower, if there is one. Pr turn another tap on just a dribble when you start the shower?
We have these issues with "smart"? controllers that think there is a leak

Pressure is bleeding back through the pump or system to the tank or well or where ever the water is coming from. Should be some sort of one way valve to keep water from going back to the source, mounted somewhere so that once pressure is pumped up, it will hold that pressure in the part of the system that has the pressure switch that controls the pump.

That or you have a leak where you can't see it. (Actually you do, it is just internal and not leaking outside the pipes!)

Does your system equipped with pressure tank (pneumatic tank)? If it has, maybe it's already filled with water due to some pinhole leaks. Drain the tank and see what will happen.

MAKE SURE THE PUMP IS WIRED FOR 120/220. THE WIRE GAUGE
SHOULD BE #12 OR #10 IF 100 FEET.

First check with a pressure gauge to see that the pressure is, indeed, dropping. Then, if it is possible, turn off the outlet valve to isolate the pump.
If pressure is still dropping, there is probably a check valve on the inlet of the pump that prevents water from the high pressure side from leaking back to the inlet piping side.
To test this, let the pump run and pressurize the house and immediately close the valve for the incoming water. If the pressure holds, then open the inlet valve and see if the pressure drops. If it drops, the inlet check valve has to be replaced (or cleaned).
Gary

Hi,
Either the motor has gone bad and will not start or the capacitor is bad and is not helping the motor to start...an experience repair person can tell tou what is happening...

heatman101