Washing Machine Pump

Washing machine pump The following washing machine pump help concerns UK washing machines although the principles should be similar to most appliance pumps. The water pump in a washing machine is one of the most common causes of breakdowns – though more often due to obstructions and blockages.

Where can I buy a washing machine pump?

If you need to replace your washing machine pump you can buy one quickly and easily using Ransom Spares – Buy washing machine pumps (guaranteed cheapest prices). Using this spares site costs no more than going directly to them but helps support my sites by assigning a small commission to me.

How does a pump work?

spares-button-lge The main thing to know is that the pump runs on mains voltage, and spins an impeller round creating a vortex and expelling water out. It’s an extremely simple part.

There are two wires to the field coil on the pump, a live and a neutral.

It doesn’t matter which way round they go. Most modern washing machine pumps have plastic fixing brackets so theymust be earthed with a separate earth wire (yellow and green). Some pumps don’t need earthing as they are double insulated. If it needs earthing there will be an earth wire close to it and a connection tab on some metal part of the pump.

A pump is an extremely simple induction motor with an impeller and no serviceable parts. To run the pump the machine just supplies it with power (some may have permanent live feed and be turned on by supplying a neutral return). The pump impeller just spins round and pumps water. It either runs or it doesn’t.

The only thing you can check is connections to it, see if the impeller is jammed, or test the continuity of the stator across the two connectors. Do not test anything with the machine connected to the mains.

Can I repair a pump?

Most (UK) washing machine pumps are no longer repairable. If any fault develops, you need to buy a complete pump. An exception is that you can usually buy a pump filter (if fitted) separately. However, the most common cause of a washing machine that wont empty water is an obstruction in the filter or pump, so read the rest of this page for further advice.

What commonly goes wrong with the pump?

Failed The most common problem by far, is an obstruction stopping the pump impeller from spinning, or obstructing water flow into or out of the pump. You can often detect this by listening carefully when putting the washing machine onto spin. Before the motor starts to turn, if you can hear a gentle humming noise, this may be a jammed pump trying to turn.

Some obstructions such as socks or a blocked filter don’t stop the pump impeller from spinning but can prevent or restrict water from flowing out through the drain hose.

If you have a washing machine full of water and need to drain the water and investigate it follow the instructions on Washing machine won’t drain water. The article also describes how to check the pump filter.

Unusual consequences of an open circuit pump

If the field coil of a water pump goes open circuit, (or the neutral wire becomes detached or broken) then apart from the pump failing to run, the washing machine may not take in any water. This is because the pump sometimes shares the neutral with the water valves. It’s relatively rare for a pump to go open circuit.

Leaking Pump

Washing machine pumps are prone to leaking. They can then seize up because of corrosion or they can continue to work but just leak. A leaking water pump must be replaced as no seals are available.

Noisy Pump

Washing machine pumps can become noisy if the bearings fail. Nine times out of ten though, a noisy pump is caused by an obstruction colliding with the rotating impeller. This often manifests itself as a grinding, grating sound that can come and go or be constant (depending on the obstruction). If the noise is due to bearing failure then the pump must be replaced, but check for small obstructions first.

More articles on pumps

This article is one of a series on pumps. More here –

You shouldn’t be messing with washing machines unless you are experienced at repairing and maintaining things and know what you are doing around electrics. Here is some vital advice – 3 good pre repair tips | DIY Washing machine repair warnings: 8 things you should never do

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23 thoughts on “Washing Machine Pump”

  1. Great article, certainly of help. Turns out that the pump on my Hoover machine died so I replaced it, turned it on and it works. Problem is, it’s now permanently on so when I start a cycle it drains fresh water away which creates a E02 error. I suspect a sensor isn’t detecting water at a certain level so the cleaning process does not start. Why would the pump stay on permanently. The pump is off when I turn the dial to a setting but once I press start, the pump comes on and won’t stop. Any help much appreciated.

  2. Thanks Paul. A pump can only run constantly if it has a live feed and a neutral return connection. The only way a washing machine would energise the pump out of context (that is when it shouldn’t normally be pumping) is when it detects a fault such as overfilling, or overheating.

    It is possible that the E2 error is the actual fault, and the pump is being energised because of it. I don’t have too many Hoover error codes but most of the ones I can see using the number 2 relate to either the thermistor on the heating element or timing out on fill, or faults with the pressure system.

    If the pump wasn’t running all the time before it was replaced you have to consider the possibility of something having gone wrong during the repair. But it is difficult to think of anything that is likely to be responsible unless by any chance the machine was turned upside down or water leaked onto electrical parts. Just make sure it is correctly wired. If it has an earth wire make sure the earth (yellow and green) isn’t connected to the neutral or anything daft like that.

    Other than that I’d advise getting an engineer.

  3. Thanks for getting back to me Andy and the advise. I took the time to browse your site yesterday and some of the obvious issues. The pressure switch is a simple single switch which appears to work perfectly. The hose is intact and running clear. No earth on the pump but checked the wiring loom which is ok. Noticed a black patch on the PCB so removed the board and notice one of the relays is faulty. I have no schematic for this machine but wonder if this relay operates the pump. would make sense if the relay is stuck on. Worth mentioning that if I run the spin program, when if ends after 10 minutes the pump continues to spin. It only stops when I power the machine off. I’ve ordered a relay for the princely sum of £2.43, with any luck this will fix the problem. Will let you know how it goes once it arrives in a couple of days. Thanks

  4. Yes please let us know how you get on Paul. Normally the relay controls the heating element, because of the amount of power it draws it makes sense to use a relay. But if there is more than one relay then it’s possible it could power the pump.

  5. Brian Stephenson

    My hoover oph 714D has got a noisy pump like a grating sound but still works
    Are they easy to fit

  6. Brian Stephenson

    I have checked my drain pump on my hoover oph 714d 1/80 for obstructions but none found pump is making a grating noise will I have to replace the pump I have got a pump Askoll model m254 will this be ok

  7. I have a Indesit IWDC6125, that about 2 years old, and have a issue with the drain on my washing machine. The water has drained, and there’s nothing stuck in the pre-chamber, but it’s making a noise that is not the normal draining hum. Could you advise what this could be and what would be the best action to take please? Thanks.

  8. Hello Sue. If the pump is still draining but making a noise you have to make a judgement call as to whether to call an engineer or not. A noise could be something loose and vibrating, or something inside catching on the impeller of signs of the pump wearing. Unfortunately not being able to hear the noise stops be from being able to guess what it is.

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