I have a pressure booster pump installed which turns on automatically when we open the tap and turns off by itself when we close the tap, but when power goes and comes back(common in india), the pump will turn on even with no tap opened and does not turn off automatically and goes on running, some kind of airlock problem I think, when we just shut off and on water input several times, it again starts working well

SOURCE: house pressure water pump has to be reset to

it sounds like a relay for the auto shut off ....http://www.smarter.com/water-pumps/grundfos-mq3-35-3-4-hp-pressure/pd--ch-47--pi-11277834.html

SOURCE: Leaks water out of the back

Well, I am no plumber but I would think that 108 psi is a bit high for your plumbing system. I have this pump installed in my house and have the max pressure set at 50 with a PRV on the outlet side of the pump.

SOURCE: The pump will not come on when a tap is opened.

Probally the pressure switch on your pressure tank.

SOURCE: grundfos mq3-45 pressure booster pump

Thanks for your question!
I'm sorry that you haven't received an answer yet.
The response rate on FixYa FREE questions is usually over 80%, but sometimes questions go un-answered when:
1. the question is unclear, incomplete, or poorly worded...
2. the question is mis-categorized - so the correct experts aren't viewing it...
3. the question requires an answer for something that cannot be explained online adequately...
4. specific training, tools, or equipment are required to avoid injury or death...
5. the Experts that are online simply don't have the resources to answer your question fully...
Please feel free to re-work your question if you feel one of these may be the reason.
Of course you are not required - but converting your question to a PAID one usually increases the reply rate as well.
Normal rates for FixYa are...
$ 9.99 answer for one question.
$12.99 Live Real-Time online chat or premium e-mail support.
$29.99 Live Real Time phone support
Sometimes FixYa will run specials for unlimited questions via monthly subscription or reduced rates for limited periods.


Consider the savings that can be had when an informed Expert can save you a $100 service call, or a $350 trip to the car dealership.
Your problem solved - guaranteed! Or your money back!!

If you don't want to pay - feel free to re-submit your question so it returns back to the top of the work queue if you still need help.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for helping with your FREE question

Stephen Davies

• 2 Answers
• Posted on Oct 29, 2010

SOURCE: my mq 35 pump, has started to splutter and the

Sounds like it may be air in the system - there is a black plastic bleeder screw on the top of the pump - open it and let air escape, if any, then fill with water, close screw and start pump.