Grundfos pump keeps cycling

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. How to diagnose, find and fix the cause of intermittent or irregular well pump cycling on and off:. Intermittent water pump cycling means that the water pump comes on for no apparent reason. Reader Question: Nov 16, Jay said:. My bladder tank kicks on every like 30 seconds and runs for about five minutes then kicks off and then about 20 seconds later it repeats itself?

Any suggestions on what I should try or do? Intermittent water pump cycling which we explain here means that the water pump comes on for no apparent reason - that is, you are unaware of any water running in the building. When water is running in a building served by a private well and water tank and pump system it is normal for the water pump to cycle on and off to deliver water to the building.

Here are the more likely causes of the water pump coming on at odd times when you're not aware of running any water. You may want to investigate these possible causes roughly in the order they are listed below. Short cycling of a water pump means that the water pump turns on and off too rapidly or too frequently when water is being run in the building. Loss of water pressure means that the pressure with which water enters a plumbing fixture has become too slow, or is sometimes too slow or weak in water flow rate, or water flow may stop entirely.

Mar 27, tammie said: my pump kicks on then as it shuts off it hesitates 4 or 5 times and the bladder is not filled does this with and without water running. Sounds like a clogged water filter, pipe, closed valve, or a bladder stuck to itself in the pressure tank. Occasionally burned pump contacts, loose wiring, or even a debris -clogged pressure switch could be at fault but usually the trouble is that the pump can't send water out into the pressure tank or building fast enough: a blockage is making it reach cutoff pressure almost immediately - seconds or less after it starts.

June 17, Gil said: New water pump installed recently. Concerned because pump will turn on for no reason approx. Is this normal? There is a big storm passing through the area here in Lansdale,Pa and at first I attributed that to the frequent breaker short ciruiting, however the only breaker that needs to be reset is the well pump one.

And now the pump no longer works it is a brand new pump and just recently intalled, flipping the breaker causes a thump and cuts the breaker back to off again. Also the orignal pump also went bad during a storm is thier any correlation there? Need to pick someone's brain. Also any suggestion for any local Lansdale, PA reputable well repair men obviouslt the last guys failed to get the job done.

My pressure tank is an old galvanized steel, air over water tank. The pump cycles every 12 minutes for 2 minutes, like clockwork, when no water is running. I have shut off all the valves downstream from the pressure tank, so I think it is either the tank or the foot valve or both? Is it normal for a pump to run so regularly?

Why Is My Well Pump Short Cycling?

By the way it is also very hot to the touch. Sept 2, Carl said: I have a well on our farm house with a 44 gal. WelTrol tank. Yesterday it started short cycling when no water was being used.

The tank feels like it is completely full of water. I can't shake it and tapping it anywhere, even at the very top, sounds solid, no metal ring like a healthy tank sounds. It cycles on and off every five 5 seconds. It runs up to about 80 cuts off then back on again at 50 and all that takes 5 seconds or so. I'm guessing the bladder has completely failed.InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Water pump won't stop running: Several problems can cause a water pump to keep running instead of shutting off when it should, and each of these suggests its own diagnostic step to finding out what's happening with your well pump. The photograph at page top shows a one-line jet pump, the water pressure tank, and a water softener.

We know from the fact that this is a single line jet well pump that the well is a shallow one, probably less than 27' deep. Well depth may have implications for water quantity and quality and vulnerability to surface water contamination. Watch out : the first thing to do to protect your pump from damage if it simply wont' turn off is to shut off electrical power to the pump.

Running a water pump "dry" risks causing internal damage to the pump. How to diagnose a water pump that won't shut off - the well pump keeps on running. Step through the diagnostic points in the table below.

If water is running somewhere in the building water supply system don't forget outside garden hoses and lawn sprinklers at a rate faster than the pump can deliver from the well, the pump will run continuously. If the pump continues to run the problem is not likely to be a running fixture or pipe leak downstream in the building from this point. If you have turned off water at the water pressure tank and the well pump is still running, before blaming the pump, controls, piping, well, look once more for water supply piping that may be ahead of the valve where you turned off water.

Turn off or repair running toilets, outdoor garden hose hook-ups or lawn sprinklers, or supply piping that is leaking. If this was the problem source the well pump will continue to run until pressure builds up to the pressure control switch cut-out level and the pump should stop.

If the above-ground jet pump pump has lost prime the pump may be running "dry" continuously. If no water is being delivered and the pump is running and it's an above ground pump, turn off power and inspect the pump cavity for the presence of water by removing the priming plug. Make sure that you have adequately primed the pump and do not let a well pump run dry - you are likely to damage it.

If you or someone else has tried "adjusting" the cut-in or cut-out settings of the pressure control switch, it may be set improperly. This is more likely if someone has been fooling around with the switch. Watch out : a damaged, jammed, or improperly-set pressure control switch that is calling for a pressure that is above the pump's capacity will cause the pump to run continuously and is likely to burn-up the pump motor.

If the switch is not responding consistently to changes in building water pressure the pressure-sensing component of the switch or the tubing connecting it maybe defective. The clog could also be debris in the orifice on the bottom of the pressure switch sensor, or inside the sensor requiring that the switch be replaced. Arcing may have burned the pressure control switch contacts. In some cases the contacts may become "welded" together in the closed power on position.

Turn off electrical power for safety and examine the contact points. If they are stuck together and burned this may be the problem. A reader reported that their well pump had been wired incorrectly when it was installed, such that the pump ran continuously. This dangerous error is more likely to occur with a submersible pump whose noise is not going to be heard.

The reader noticed that building water pressure was sometimes dangerously high, around psi! A burst pipe or water tank can both flood the building and injure anyone who is nearby. The effects of an always-on also include pump damage and failure, exhausting the water well and of course an elevated electric bill. Also check for a pressure control switch whose contact points have welded shut as that too will keep the pump running.

A bad leak anywhere in the well piping between the building water pressure tank and the bottom of the well can leak enough water when the pump is running that the pump cannot raise pressure in the pressure tank up to the cut-out level and the well pump will continue running.

A leak anywhere on the well piping including on the suction line of a 2-line jet pump will also cause the pump to run-on or to lose the ability to pump to higher pressures. A suction leak anywhere above the water level in the well will often also add air to the building's water system. A common location for a suction leak is where the well piping 1 line jet pump or suction line 2 line jet pump is connected to the pump's impeller assembly.

Suction line leaks that are below the water level in the well won't draw air into the piping system but may still leak water back into the well when the pump has stopped.

Close the main building water supply valve between the pressure tank and the rest of the building. Also air coming out of building plumbing fixtures can be caused by air leaks into the same well piping when the pump is not running.SCALA2 is a fully integrated water booster pump providing perfect water pressure in all taps at all times — even with multiple taps and showers running at the same time.

It packs pump, motor, tank, sensor, drive and non-return valve into one compact unit. And with its intelligent pump control, SCALA2 automatically adjusts performance to both inlet pressure and water consumption in the home. Thanks to a water-cooled motor, SCALA2 even offers one of the lowest noise levels of any booster on the market. SCALA2 features a built-in sensor, which constantly measures the discharge pressure. If the pressure drops below the desired level, SCALA2 boosts its operation immediately to compensate for the loss of pressure.

We call it intelligent pump control and the result is perfect water pressure. SCALA2 is the perfect choice for residential buildings with up to 3 floors and 8 taps. For service questions, warrantee information, energy audits or to schedule repair, please contact us.

Overview Literature Service Contact Overview. Perfect water pressure — finally compact and easy to install SCALA2 is a fully integrated water booster pump providing perfect water pressure in all taps at all times — even with multiple taps and showers running at the same time. What is intelligent pump control? Benefits Perfect water pressure: Intelligent pump control adjusts operation automatically Low noise: As quiet as a modern dishwasher 47 dB A in typical use Easy selection: One variant for all domestic boosting needs Easy installation : Compact, all-in-one solution, plug-and-pump Easy to operate : User-friendly control panel Reliable operation: Dry-running protection, anti-cycling Long lifetime: Quality-tested to perfection, maintenance-free Applications SCALA2 is the perfect choice for residential buildings with up to 3 floors and 8 taps.

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Well pump turns on and off rapidly or too often: this article defines short cycling or rapid cycling well pumps and the various causes and cures for that problem. We explain why rapid on-off switching of the water pump can be harmful and how it also affects building water pressure.

We explain that often sort cycling indicates the need for air in a water pressure tank. In companion articles we explain several ways to add air to a building water pressure tank, and how to detect and correct air and water leaks in a building water supply system where a private well is the water source. We also discuss how to adjust the building water pressure by setting the cut-in and cut-out pressure on the pump pressure control switch.

Several alternative procedures for adding air to a water pressure tank are described below along with advice about what to do when things go wrong, such as finding air and water leaks. The illustration at page top is courtesy of Carson Dunlop AssociatesInc.

grundfos pump keeps cycling

Short cycling of a water pump means that the water pump or "well pump" turns on and off too rapidly or too frequently when water is being run in the building. Extreme water pump short cycling may occur every second or less and means you should turn off the pump system to avoid damaging the pump or controls. Loss of water pressure means that the pressure with which water enters a plumbing fixture has become too slow, or is sometimes too slow or weak in water flow rate, or water flow may stop entirely.

I have a small pressure tank and expect that the pump will have to turn on and off, but when is it cycling too fast?

grundfos pump keeps cycling

How many seconds should it run before kicking off and then restarting? If a pump, tank, piping, well are in perfect condition and the pump is cycling on and off for a moderate water flow usage rate such as someone running a bathroom sink faucet, then if the pump is turning on and off more often than every 30 seconds I'd want a larger pressure tank. The pump manufacturers, are, however the final authority on this so you'll want to check with the company who makes your tank.

Certainly if a pump under any circumstances is turning on and off every few seconds or less, something's seriously wrong and the pump or its controls are likely to be damaged or to have a short life. Watch out : For pressure boosting pumps that do not use any pressure tank the control that turns the pump on and off is built into the pumpthe pump turns on as soon as a plumbing fixture is opened to run water and runs all the time water is being run.

If the pressure booster pump that does not use a pressure tank such as the new Grundfos Scala2 tankless pressure pump is cycling on and off repeatedly in short intervals further investigation is needed: there may be a plumbing leak soaking your building. Watch out : with tankless booster pumps: any small leak such as a running toilet or pinhole leak in a pipe may cause the pressure booster pump to cycle on and off more frequently than the manufacturer intends - risking damage to the pump.

grundfos pump keeps cycling

The "water storage tank" is doing more than storing water. Its air charge acts like a spring to smooth the delivery of water in the building.

If the building water supply pump is "short cycling" - coming on and off rapidly, you may need to add air to the water pressure tank.

This step is important to protect your private pump and well from damage due to short-cycling due to loss of air in the pressure tank.The CRE pump is a system which is able to solve application problems and save energy. The basic CR pump range, which can be applied in almost any industrial solution, is already in itself the broadest range available. Through our modular approach, we have made it even broader.

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Currently, these performance-optimized systems are available in configurations with up to six CR pumps, allowing for flows of up to 5, gpm. The expanded range of CRs can also be integrated into Grundfos Engineered Systemswhich offer unique systems designed and engineered specifically to meet the needs of your project. CR pumps provide a complete range of pump solutions so that all applications, industrial and domestic, can benefit from the Grundfos touch. The applications that can be covered include the following:.

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Grundfos MQ

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Here are some of the reasons why your well pump may be short cycling, and what can be done to fix them. Loss of air charge is, perhaps, the most common reasons your water pump will short cycle. If you have an older, non-bladder type water pressure tank, this is almost always the reason.

Look at the condensation line. To fix this, first make sure the air volume control valve is not dirty or leaking. This is typically the place where the problem lies.

If it is, clean and fix it, then use the water tank air inlet valve to pump air into the tank with a bicycle pump. You will also want to drain some water from the tank to create room for the air. This should restore the normal function. If you have sufficient air but still have short cycling, you may have a faulty or clogged water pump pressure control switch. This can occur when the water is full of silt or other debris, or when the water has high mineral content.

Replace or repair the switch to restore normal function. If the water supply pipes become clogged, the pump will short cycle. A clog in the water supply creates high water pressure very quickly. The best way to check for this is to check the water filter. Over charging can damage the water tank or break the bladder, so this is something you need to avoid.

As you can see, there are quite a large number of reasons for a well pump to cycle.

grundfos pump keeps cycling

Our technicians can quickly diagnose the problem and offer prompt repair, so you can get back to normal function of your system. A Message To Our Community: Read our communication regarding new measures our team is enacting in this critical time. Water Pump Control Switch Problems If you have sufficient air but still have short cycling, you may have a faulty or clogged water pump pressure control switch. Blocked Water Supply Piping If the water supply pipes become clogged, the pump will short cycle.

Get Professional Help for Well Pump Cycling As you can see, there are quite a large number of reasons for a well pump to cycle. Yes, I would like to learn more about your sales events, promotions and products. See Reviews. Read our Reviews on Google 4. Follow Us. We Accept.Water is life. Log in or Sign up. Joined: May 22, Location: Scotland.

We lived with it until about a month ago when I saw my electricity bill!! I got in touch with the contractor who drilled our borehole and installed the pump. Gave the symptoms and he suggested a leak in the system. I was sure we didn't have one but did not excavate pipework underground.

I told him we ruled out a leak and he suggested we replace the pressure sensor which was the cheapest option. This didn't sort it so he came out.

How to Troubleshoot a Grundfos MQ Pump

He lifted the pump and saw that when disconnected at the top the water didn't drop back down the rising main so the non return valve was working.

We then replaced the CU control panel, and today the pump. It's still happening and won't turn off. I haven't excavated the underground pipework yet. Does anyone have any ideas please. Jim ScottMay 22, Then while no one is using water shut the pump off manually. Then either the pressure transducer sensor is not working, it is not getting a signal to the CU computer, the CU is not communicating with the other computer in the SQE motor, or there could be any number of glitches in one of the two computers.

The only good thing about the SQE is that it will run off a standard pressure switch in place of the CU Then you can be sure it will turn off when the pressure gets to 60 PSI.

This will give you the 50 PSI constant that you want, and allow you to keep the small pressure tank you have. Or you can do without the CSV if you install a very large tank, and get use to the pressure fluctuating between 40 and 60 anytime you are using water. Joined: Dec 28, Occupation: "retired" and still building and troubleshooting Location: northfork, california. All agreed, but so what with the 10, rpm's if the bearings are correctly designed to survive that?

And the control sys may be fatally flawed, but I do not think the pump itself Qualifies as a toy by any standard. The SQE spins 3 little impellers really fast to produce the same water as about 10 impellers in a normal speed pump. They will both grind or cut metal, but which one will last the longest? If I were cutting metal all day, I would consider the Dremel a toy compared to a bench grinder.

I'd install a Square "D" pressure switch and a Cycle Stop Valve and forget the complicated troublesome computer. Then when replacing the pump I'd go back to a regular 4" pump. I dont know much about the SQE and wouldnt buy one, but grunfos seems to have created some pretty amazing products from their own engineering.


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