No water pressure BOSH SRV 55

Post by **Novel** » 31 Jul 2019, 08:19

There is a PMM BOSH SRV 55. It is approximately 11 years old. Worked great. Not used often, but used. I stopped washing here. An autopsy showed that the water pressure in the system was very low. From the lower sprinkler the streams rise 10 centimeters and it naturally does not rotate. But it is understandable. The flow from the top is also weak and there is no talk of rotation. I checked everything - inlet and drain and filters - everything is in perfect order. But the effect is zero. I removed the bottom and took out the recirculation pump. No leaks. Everything underneath is clean. Rotates smoothly. If you spin it, it continues to spin for several seconds. I took the snail apart. Everything is perfect. No dirt, no scratches. Everything is easy to understand. The rubber seal is intact. Since the supply contacts are not visible, the engine itself had to be halved. I took it apart. There is no corrosion. All is clear. The bearings rotate, the seals are intact. The winding itself is almost like new. I saw 4 ends. I rang. One is about 49 ohms, the second is 48.5 ohms. There is endless resistance between each other. There is also no breakdown to the ground. Just in case, the capacitor rang. There is also no breakdown. The device shows 8.8 microfarads. It says 9. Apparently this is true. I collected everything in a heap and in place. I turn it on. After drawing water, the pump turns on. It rotates quietly, apparently making about 1000 revolutions per minute. But there is no pressure. I checked the connections to the pump, well, one can already see that it’s clean, and the impeller itself is visible there and you can turn it, the drain side also seems to be clean, but as far as you can see. Already wondering what could be there? At what speed should this pump rotate? The pump itself is marked 5600.053016 MO1917 -230-240V.

Guest · Post by **Guest** » 27 May 2020, 20:38

What happened in the end? did you fix the problem?

Post by **Novel** » 28 May 2020, 09:13

Yes, he eliminated it. For 1.8 thousand rubles. I kicked out the technician who tried to install a new circulation pump. I replaced the impeller on the old one along with the oil seal. And instead of a disposable clamp, I installed a tightening clamp at the pump outlet.

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At the same time, I cleaned all the contacts and lubricated the rinse aid dispenser mechanism. There is nothing complicated there. The only thing is that you have to pull it out and turn it over and water flows in...

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The impeller there is made in such a way that it falls apart into two halves over time. In principle, it can be repaired, but it is advisable to change the oil seal as well. And it is sold complete with this impeller.

Guest · Post by **Guest** » 27 Oct 2020, 15:42

I have exactly the same problem. but the impeller is intact. I don’t understand what’s wrong? Can you describe in more detail what else you did? You can send me a personal message here sbox58@bk.ru My name is Vyacheslav, I really hope for you.

Post by **Novel** » 27 Oct 2020, 16:37

Is the motor spinning? The first thing to do is check the integrity of the motor windings. There are three of them, if memory serves. I don’t remember anymore, but there are meanings somewhere. There are hundreds of ohms. Then check the engine power. Well, if he’s intact, of course. Well, let’s continue dancing from this. The diagram of the engine itself is here https://yandex.ru/images/search?from =ta ... rpt=simage

Guest · Post by **Guest** » 28 Oct 2020, 09:53

The engine is intact and spins, the impeller is intact, everything is clean everywhere. I tried to run the machine for the shortest wash (without dishes, of course). I discovered that the water was not heating up. The cycle did not end on its own, although before starting I reset it, or rather did a reboot (reset). Maybe something with the heating element? and is it somehow connected to the pump? During operation, the PMM opened the door. The pressure was weak, 10-15 cm on the lower sprinkler, on the upper one, the water generally flowed.

Guest · Post by **Guest** » 28 Oct 2020, 10:01

Now I’ll disassemble the machine. I’ll try to check the heater. Maybe there’s something wrong with the contacts?

Post by **Novel** » 28 Oct 2020, 10:14

If the engine spins, then you are in great luck. In this machine, the motor and the heater are two different units. It is easy to check the heater with a tester. But the bad pressure is most likely the impeller. There your hand gets through, pull it, there is a delamination of the impeller itself and it looks normal, but in fact it does not pump. Pull it, there the upper part of it should not live a separate life from the lower one. And this is exactly what is happening.

Guest · Post by **Guest** » 28 Oct 2020, 10:29

Now I’ll disassemble the PMM and check it, I’ll report back in the evening. Thank you.

Guest · Post by **Guest** » 28 Oct 2020, 11:46

I took it apart, the impeller is intact, it holds tightly as a single whole. I have this suspicion. When the pump stops working normally, i.e. low pressure, I called a technician. When the technician arrived, the pump did not spin up at all; it turned out that the capacitor did not give the required value of 9 microfarads; they replaced it with another one, but the pressure did not appear. And the suspicion is that the technician simply mixed up the connections on the pump and it is rotating in the wrong direction, could this be possible?

Guest · Post by **Guest** » 28 Oct 2020, 12:00

I found it on the Internet, but I don’t understand the same connection?

Guest · Post by **Guest** » 28 Oct 2020, 12:08

If the rotation is not correct, then there will be no pressure and, accordingly, there will be no heating either. I understand correctly?

Post by **Novel** » 28 Oct 2020, 13:18

Well, in theory, yes. But there the pump is powered by alternating current, that is, it always rotates in the right direction. And you can see from the impeller which direction it should rotate.

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I gave the same diagram

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Look at approximately how many revolutions it makes. Should be around 1000

Guest · Post by **Guest** » 28 Oct 2020, 15:22

Everything is fine with rotation. It seemed like there was pressure. Another question, it seemed to me that the impellers work in turns, then the upper one, then the lower one. But the water still does not heat up. And yet, just now I was driving the PMM, but it never turned off. Shows 1 minute remaining. I retested again. Yes, here’s something else that came out - when the machine filled with water and the circulation pump turned on, an incomprehensible sound was heard, I sharply opened the door and there was no water in the pan, only after 1-5 seconds the glass entered the pan, it seems that the filling level was too low. I added 0.5 liters and everything went as it should. but there was no heating. Will I have to call a specialist? I’m already disassembling and reassembling this PMM with my eyes closed, but it’s no use.

Guest · Post by **Guest** » 28 Oct 2020, 15:43

What should the water level be in the PMM? Can you send a photo?

Guest · Post by **Guest** » 28 Oct 2020, 16:04

I found the reason. Insufficient water level when filling. I added more water and everything worked and it heats up and the pressure is excellent. The reason is clear, I will use the Internet.

Post by **Novel** » 28 Oct 2020, 17:14

I had this too. The reason is the pressure switch. It’s on the side. Something got into it when I turned the machine over. He was covered in scale. I cleaned it and checked its operation. I cleaned it with a brush. Nodes where friction was lubricated with silicone grease. It’s on the side with a red and blue stem. There, the blue one is the pressure switch itself, and the red emergency valve seems to prevent leaks.

Guest · Post by **Guest** » 28 Oct 2020, 18:47

PMM works great. The reason was a rusted solenoid valve stem. Cleaned it and put it back in place. This is of course temporary, I’ll try to find a stock in the PMM service department. Thank you, Roman, for your advice and participation.

Guest · Post by **Guest** » 28 Oct 2020, 18:51

The pressure switch and float are due to water overflow, but mine was underfilled. Thank you

Post by **Novel** » 29 Oct 2020, 06:55

Give the rod to the turner, he will turn it out of stainless steel.

Post by **botsmanold** » 22 Apr 2023, 08:22

I’ll add to this topic - there was a similar breakdown due to the fact that the pump wheel “halved” (it is made of two parts). Assembled and glued (in a second), the test went fine, I’ll probably change it based on observations

Post by **Novel** » 22 Apr 2023, 09:34

Buy a new repair kit. There is also an oil seal there. The glue won’t last long, I glued it with SA.

No water pressure BOSH SRV 55

No water pressure BOSH SRV 55 ⇐ Bosch

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