Thread Number: 33481  /  Tag: Recent Vacuum Cleaners from past 20 years
Miele S548 Auto mode
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Post# 364777   1/6/2017 at 21:05 (2,638 days old) by Spacedogb (louisiana)        

Hello everyone,
I just purchased a Miele S548 and when I put it in auto mode it just goes to max speed and stays there no matter what attachment or power nozzle put on. Can someone please tell me where to look to correct this problem?

Thanks,
Blake


Post# 364808 , Reply# 1   1/7/2017 at 08:13 (2,638 days old) by vacerator (Macomb Michigan)        
Blake,

just be glad it still runs at all.
What does it do when you cover the hose end with your hand? If it slows down then speeds up, that's how it is supposed to work.
This is designed to save electricity.
If part of one of the circuit boards is bad, or a pressure transducer, it malfunctions. Not likely to happen, but if it was dropped hard on the floor, a small pressure hose may have disconnected from a transducer.
Also check the filters. If they are ready to be changed, performance is affected, same for the bag being almost full.
Miele may use a higher quality pcb board than Electrolux, but I had to gut the electronics and transducers on one made in Hungary to get it to run again.
The boards say made in Hungary, the transducers China.


Post# 364823 , Reply# 2   1/7/2017 at 10:09 (2,637 days old) by Spacedogb (louisiana)        

It doesn't speed up or slow down. When turned on in auto mode it just goes straight to high speed and stays there. It doesn't slow down or change speeds.

Post# 364875 , Reply# 3   1/8/2017 at 09:33 (2,636 days old) by vacerator (Macomb Michigan)        
Blake,

does it change speeds when using the manual speed selectors?
if so, I'd leave it alone. Even if it only runs on high all the time.


Post# 364908 , Reply# 4   1/8/2017 at 23:52 (2,636 days old) by luxflairguy (Wilmington, NC)        

Gee, Mike. I din't know you'd taken a night class in Miele repair. Are you sure you know what you're talking about? You sure haven't over on AW!

Post# 364911 , Reply# 5   1/9/2017 at 07:00 (2,636 days old) by vacerator (Macomb Michigan)        
Gregg, a company named Leffoo makes those pressure sensors.

I try. I'm not perfect. It seems you get a rise out of me though. Not very noble now is it?
Did your ancestors make Binoculars? Oh, sorry, that's Bushnell. I also use word association to remember names.
I blocked your posts the very first time you badgered me, but, maybe because I was bullied about a few times in my youth, I stick up for myself, and counter back.
There are folks who know me for real who are amazed that I am well read and versed enough to be able to converse with others of many different professions.
Half a nice day, if half the day is god anymore, it's a good day.
Peace.


Post# 364915 , Reply# 6   1/9/2017 at 11:02 (2,635 days old) by Spacedogb (louisiana)        

It does change speeds when manually selected but just goes straight to high and stays there when put in automatic mode. I will be bringing it to a vacuum repair shop to find out the true cause. I trashed a Dimension 1000 because of this same problem. Now that I'm a little older I'd like to find out the problem lol

Post# 364959 , Reply# 7   1/10/2017 at 07:14 (2,635 days old) by vacerator (Macomb Michigan)        
Brett,

I thinks that's a good idea to have a Miele service dealer check it out.
I doubt there is much in common with the electronics of an older Hoover Dimension 1000. It didn't have an automatic suction control, just a variable speed switch.
The way these work, is that when a reduction in suction is sensed by the pressure sensors, they close a circuit or open it to the motor speed control board.
These sensors are mounted on a separate board, or two. One for motor speed, one for filter and or bag air flow to trigger the performance indicator led lights.
Selecting a manual speed over rides the automatic function.
I also took our kids E-Lux to an authorized service place at first. I don't know what was up, but the counter person saw me eying a Miele and I expressed interest. The next day, one of his techs. called me and told me the cord reel was shot and was over $200 to replace. before I took it in there, the cord was retracting fine, and the led's on the control panel lit up. This was a $400 machine from Lowes.
I declined the repair, and opened it up myself. I immediately discovered a blown fuse on the sumo board that controls the motor. He had all the small vacuum hoses messed up, so I couldn't tell which went where had I even replaced the main pcb board, so I removed all the boards, and wired the motor directly to the main switch.
Caveat Emptor-"buyer beware"! As I was complaining the stores manager, his face just got red.


Post# 364962 , Reply# 8   1/10/2017 at 08:14 (2,635 days old) by kirbysthebest (Midwest)        
I will plead ignorant,

But I must ask.  Have you checked to see if there are any clogs in the air path.  Hose, wands etc.   This could cause the machine to sense the need for more power.   Just a thought.

 

 

I am not a repair person, and I don't play one on TV either.

 


Post# 364964 , Reply# 9   1/10/2017 at 08:46 (2,635 days old) by vacerator (Macomb Michigan)        
Yeah,

I suggested checking his filters and air paths in a previous comment.
I've worked with vacuum lines on cars a lot. They can crack and cause vacuum leaks, a rough or high idle speed, a check engine light that won't stay out, etc.
I don't play mechanic on tv either, but there are some crossover principles, as with chemistry and metallurgy.
A certified reputable tech. will test the continuity of curcuits, and sensors with an ohmmeter.
An auto mechanic uses a diagnostic computer.
One did on my sister Olds Aurora that kept stalling and was hard starting. They couldn't fin the problem. One wanted $1,200.00 to replace sensors, fuel pump, etc., etc. She got rid of the car that was otherwise in excellent condition with only 80,000 miles on it.
My buddy's Cadillac had the same problem. Both Northstar engines.
I read an online thread the said to change the fuel pressure regulator on the fuel rail. An easy to replace $20 part, and the problem is fixed.


Post# 364986 , Reply# 10   1/10/2017 at 22:03 (2,634 days old) by luxflairguy (Wilmington, NC)        

Mike why does everything you talk about always come back to cars? this isn't a car site!

Post# 364992 , Reply# 11   1/11/2017 at 05:52 (2,634 days old) by vacerator (Macomb Michigan)        
Gregg,

Many machines use the same items for similar or different functions.
I have many different interests in my blood. Cars are one, and others have also expressed their favorite cars, etc. on this site.



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