PMM does not finish washing ⇐ Hotpoint-Ariston

[schealex]

Please help with fault determination.

Given:
PMM Hotpoint Ariston HIC3B+26 (769991054232 / 869991054230) with a floating problem. After switching on, the resin regeneration process occurs, water is drawn in, the circulation pump turns on, runs for 15-30 seconds and stops. Waits 3-10 seconds and starts again. And so on endlessly until you stop it manually. During these switch-ons, the heating element does not turn on. It never produces any errors.

What has been done:
0. I cleaned the filter, added salt/detergent/rinse aid, unplugged it from the socket, the drain hose was bent upward (there is no self-draining), etc.
1. The heating element was checked for a break - resistance 27 Ohm.
2. The heating element was checked for breakdown on the body - no breakdown.
3. The fuses on the heating element have been checked - they are ringing.
4. Temperature and turbidity sensor (combined) checked. Resistance at room temperature is ~450 Ohms, decreasing when heated. I know, a lot, but I ordered a new sensor - exactly the same indicators. I read on the Internet that such sensors are also found.
5. I checked the windings of the circulation pump - they are not broken.
6. I checked the flow meter on water - when the impeller rotates with a magnet, the tester shows some numbers, I conclude that there are impulses.
7. Inspected fee regarding burnout of elements/tracks, visually everything is in order.
8. On the board, a 12V diode was soldered to the relay coil that controls the power supply of the heating element, and a 220V diode was soldered to the power ends of the relay. When the PMM is turned on, the following is observed:
a) almost immediately the coil diode lights up faintly; after starting the circulation pump (after the same 15-30 seconds), the coil diode lights up brightly, the power circuit diode also lights up (a characteristic click of the relay is turned on) and the pump is immediately turned off and all the diodes naturally go out, since the "brains" prohibit heating without circulation. Then everything is repeated in a circle ad infinitum.
b) everything is the same as in the previous paragraph, only none of the diodes scream (neither dimly nor brightly). That is, there is not even an attempt to turn on the heating element.

And now the most interesting thing: I have been tinkering with this PMM for a long time. And EVERY TIME after I take it out of the kitchen, I salt all the hoses, turn it on its side (respectably draining the remaining water onto the floor), I will disassemble/assemble, plug/plug in all the sensor chips, etc. IT WORKS ok for about a week or two. Afterwards, something may happen (or maybe not) like it will heat the water, but in the middle of the cycle it will abruptly switch to the behavior described above, and accordingly will not finish the wash, and with further attempts to start it will not heat up and finish the cycle will.

If the problem is in the control board due to some kind of accumulating error, then I don’t understand why unplugging it doesn’t help. If the problem is in the sensors/pumps/valves/heating elements, then I don’t understand why the PMM works like new for a long time after disassembly/assembly.

Maybe the salt in the tank somehow spills out when I put the PMM on its side? Just in case, I removed the salt photosensor and wrapped paper around the receiver and transmitter (like the salt is always full). Didn’t help =) And how can problems with the salt tank affect heating? To be honest, I can’t imagine what the reason could be, so I’m asking for help. Maybe someone has any thoughts on this?

P.S There is no pressure switch in this PMM.
P.P.S A cycle of 10 minutes, where only rinsing, starts and ends without problems absolutely always.

[Energy class]

Greetings.
This model has exactly the same story. And the actions taken and the consequences are the same. No operation/failure logic was identified. One difference is that in reality she ended the cycle. And even dried it. But it lasted for 4-6 hours, instead of the expected 1.5-2.

As a result, pouring boiling water over the fairies gave a miraculous effect. This time I didn’t do anything else. I took out the filters and plastic, turned off the water intake and started flushing with hot water together with the fairies. And wow. The water began to heat up. Now I will observe the effect. I ran the water 5-6 times. What did he wash there that couldn’t be washed off with finish tablets - I don’t know. But the fact remains a fact.

[Come on]

Hello! It’s very interesting, especially that the dishwasher is the same (is there a problem with this particular model?).
Yesterday I tried to launch it again. It didn’t heat up 3 times. After the last time I turned it off, I drained the water, I removed the chip from the salt sensor, turned it on and started the cycle on program 6. And the heating started! Previously, if the PMM stopped heating, then start/stop at least a thousand times, only assembly/disassembly helped, but yesterday this is how... Yesterday I didn’t dare to stop and repeat, I really didn’t want to wash the dishes with my hands, today I’ll try, we continue to monitor.
And I beg you, if you still manage to figure it out, please let me know.

[Energy class]

For now it is as it is. In the tank I just poked around with my finger a little to see if there is/isn’t there. And so - I assembled/disassembled it three times and started working for a while after plugging in chips and other things. Of all the jambs, I only saw a slightly weak clamp on the elastic band under the heating element. The self-locking one was replaced with a screw one. That’s all.
By the way, I worked with an empty tank a couple of times - everything got hot. Those. the icon was on, there really was no salt anymore. Heating without problems. Well, there was heating during the drying mode in any case.
I found similar questions about this model on an English-language forum, but without a specific solution.
I don’t know what and how the procedure could have affected it. When I took apart the insides on the last visit, everything was relatively clean both in the area of ​​the pump and in the area of ​​the heating element. I didn’t see any obvious deposits.

[schealex]

For two days the PMM was pleased with its heating with the salt sensor turned off, but now it has stopped heating again. I’ve already turned it on/off five times in different modes. I tried plugging in and pulling out the salt sensor again. Does not help…

[Pavel]

Machine Hotpoint\Ariston - ll40. After turning on the program for 45 minutes. (4th diode from the left), startup occurs. After ten minutes, the third diode (ECO) begins to flash/ The water does not drain, the program does not end (only by disconnecting from the network). The heating element is normal, the temperature sensor has been replaced. The problem remains, the dishes are wet and not washed, the program does not complete. Tell me who has encountered this?

[Dantuga]

Good afternoon. How did you finally solve the problem with periodic heating shutdowns in Hotpoint Ariston HIC3B+26 (769991054232 / 869991054230)?

[schealex]

Good afternoon. How did you finally solve the problem with periodic heating shutdowns in Hotpoint Ariston HIC3B+26 (769991054232 / 869991054230)?

Hello, but in fact I didn’t solve it at all. First, I found a technical manual that described how to launch the service program. This program, judging by the time it runs, does not complete (according to the manual it takes about 10 minutes, for me it’s about 1.5), however, if you run it, then when you start the wash, the PPM “clicks” with the heating element, but does not stop , i.e. goes well until the end. This is how I save myself. In 70 percent of cases this helps, but still not always. I also ordered bushings and an impeller for the circulation pump from Avito and replaced them. Allegedly, due to loose bushings, the motor consumes more current, and the brain thinks that there is water in the PMM when there shouldn’t be, which causes the operating mode to be disrupted. However, this didn’t really help either. There are plans to also install a drainage pump, at least clean it (because the circulation pump was very dirty), since it can also give incorrect data on current consumption for the brain.
I repeat, if anyone knows the exact reason for this behavior PMM, what I wrote in the first message, I kindly ask you to unsubscribe here.