dishwasher takes for ever

Yesterday the dishwasher took 4 hours on a normal cycle. Usually I take no notice of the time it takes, but lately sometimes I have sort of wondered why it wasn't finished.
How long does the average cycle last?
Is this a fault, and if so what is likely to sort it?
Ta Suzanne
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

My Hotpoint also did this and I cured it, eventually, by changing the inlet valve (about £20).
Peter
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

That is very long and it sounds as though it may have a fault.
Modern dishwasher technology (machine and detergent) works on the basis of filling with cold water, heating the water and then having adequate contact time with the detergent in the water to clean the contents.
Older technology, and that still in use in the U.S. uses a detergent with gritty bits and a lot of water pressure from a powerful pump to blast the soiling from the contents. It uses a lot of energy and gradually dulls surfaces. Its only saving grace is that it is faster.
Our machine, a Miele, has a whole range of cycles, and the length of time depends on the temperature selected and whether a whole machine or top only one is selected. At our most typical selection of whole machine and 75 degrees it takes two hours to run.
I would say that at 4 hrs, something is wrong and it needs a service call. Don't be tempted to make it fill from hot water, because a) it will make little or no difference if the machine is a low water volume one, b) it's not designed for this normally and c) spraying the contents initially with hot water will set any proteins and make them hard to remove.
--

.andy

To email, substitute .nospam with .gl
  Click to see the full signature.
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
wrote:

The OP's dishwasher taking 4 hours does sound a long time.
Our Bosch dishwasher only takes 2 hours on the maximum setting. 80 minutes on the next setting down and about 40 minutes on the standard setting.
It might be worth the OP checking to see that the machine is not constantly filling and pumping out during the wash part of the cycle.
This type of fault can apparently cost a fortune if you are on a water meter.

Dishwashers use so little water these days that, for most domestic installations, the hot water from the instant hot water heater or from a storage tank will never properly reach the dishwasher. By the time the hot water travels through the pipework and reaches the unit, it has filled up.
A cold fill only machine can also be confused by using a hot fill. It can reduce the length of the cycle.
Graham
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
If the Inlet valve coil breaks down the machine may fill in sporadic bursts as the circuit is made and broken. This may occur at any time through the cycle so the machine will sit and wait for water before it commences washing/rinsing and hence the time taken. At the start of the cycle it should fill in 30 seconds to a minute and the motor should start running. If it hasn't open the door and look. No water is a good bet the valve is faulty as suggested by a previous post.
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

It seems to start ok - you know there is always a cup or knife you forgot to put in and the water is always spraying when I open it up - cold water mind. There just seems to be long periods when it sits doing nothing although the water is hot when you peep in, so I don't think it is heating up. What exactly it is doing is hard to figure as there are no noises at all during these times.
Suzanne
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

I think you mean it is heating up.
Is the power draw releasing the powder into the wash?
Let it heat up and wait until it has pumped out and refilled with cold water. Do you get the delays when it is on a rinse as well as when it is on the initial hot wash?
Graham
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I should add it's a Bosch Classixx. Standard wash is 65 degrees.
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Suz wrote:

In my case, on an old Zanussi, it was the clockwork timer sticking
David
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

I thought it was some sort of timer problem - but I don't think it is clockwork? No dial turns. Just switches off when done. How would I know?
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Has the machine been out recently?
I had the same problem with my washing machine after I moved it, turns out the fill pipe got slightly kinked, so it was filling extremely slowly!
Sparks...
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Just to add to the general lack of specific advice :-)
Our dishwasher has a range of programmes from a 15 minute cold rinse through to a 170 minute (i.e. nearly 3 hours) "economy" wash at 40C (or is it 45?). The economy usually washes at least as well as the "normal" 50C or the "super" 60C wash which are 90 and 106 minutes respectively (electronic timer, usually pretty accurate) and uses less electricity and less water. All three have a long drying period at the end of the cycle.
I think that the economy setting works, despite the lower temperature, by increasing the "contact time" - i.e. it just keeps washing for longer. Is it possible that you have somehow activated such an economy setting?
The other thing that happened to us once was that it wouldn't get out of the initial pre-wash rinse. We discovered it wasn't filling properly with water for some reason - and it wasn't the inlet pipework at all.
I bunged a few pints of (hot) water into the thing in the hope that if it were a grease problem, the heat would help, and it finished the cycle fine. I then gave it a good clean out - filters, spray bars, the lot, and ran it on the hottest wash with nothing in except a small squeeze of washing up liquid. It's never had that problem since, but I repeat the empty-wash thing every couple of months, and I make sure to give it a good clean-out every time we have something like bolognese or lasagne as the tomato/mince combination seems to trap grease and stain certain plastics pink.
Someone else on this ng (one of the Andys?) reckons that a (small) drop of washing up liquid in the machine helps keep it clear of grease as apparently there are some sorts of grease which aren't transported well by dishwasher tablets.
Hwyl!
M.
--
Martin Angove: http://www.tridwr.demon.co.uk /
Two free issues: http://www.livtech.co.uk/ Living With Technology
  Click to see the full signature.
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Sat, 30 Jul 2005 20:48:38 +0100, Martin Angove

Sainsburys do some dishwasher cleaner tablets. These work very well.
The inside of the machine comes out sparkling after use.
Finish also do a dishwasher cleaner. It consists of a bottle that you place upside down into the cutlery basket. The top of the bottle (that is now facing down) has a type of wax seal. The seal melts when the machine gets up to temperature and it releases the liquid into the machine.
It's a couple of quid. The results appear to be the same as using the cheaper tablets from Sainsburys.
Graham
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

I would sack the lazy women, younger prettier one's are easy to find.
<ducks>
Add pictures here
βœ–
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.