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Hi
My Bosch dishwasher SMS69L22GB has s fault and stopped working in the middle of a quick wash cycle. The rinse aid and water led is constantly on.I manually emptied the water then checked the filter and drain pump and drain hose. Nothing wrong with these parts. Checked the flow switch with multimeter and magnet and it is working. No water leak at the base, it is completely dry. I tried to reset by plugging off and then turning on, even after leaving it off for few days. Still shows the same fault when turning it on.
The only unusual thing I noticed is that the wall plug is getting very hot. Dishwasher isn’t running but something is drawing the current, making the plug very hot. Could there be something short in the circuit?
Could it be main power module where the mains lead plugs into or could it be faulty heat pump?If I can pinpoint the faulty part then I can change it myself. Can you please help me to repair this dishwasher?
ThanksKind regards
Rjnkanwalthink you need to check the plug theory again. if there is enough current to get a plug hot then its a wonder its not going on fire. I also cant think of a component that would draw enough current to do that even the heater, which in these models would blow very quicklt if it was energised with no water
Dave
Hi Dave
I am not aware of plug theory. What do I need to check? Searching online about plug getting hot doesn’t bring the desired results. Most posts relate to when appliance was in use. I did think about the socket. I ruled it out as washing machine is plugged in to the same dual gang socket and while using washing machine the plug doesn’t even get warm.
The dishwasher plug is a moulded plug so can’t check the state of wire inside it.
Although I didn’t measure the current on the PCB but I assumed it is there as LEDs are lighting up. Thanks for your replyone socket can go faulty while the other one is not
heat is any electrical situation is caused by resistance and current. the higher the resistance the lower the current has to be to cause any substancial heat. since lights only draw a very low current its can only draw enough to heat the plug while its running and then probably when the heater is on
try swopping plugs and see if it continues
Dave
Ok the second gang could be faulty, so I decided to try another socket. As there wasn’t any socket nearby, I used the extension cable. Plugged the dishwasher and turned on the socket switch and it gave the little bang and blew the fuse on the socket. Took the lead out of the appliance and checked for the short. The earth and positive are short in the mains lead. They don’t bring 0 on the multimeter, instead show resistance of 60 to 190 ohm depending which connector I measure from. Well lead is definitely short.
Now the question is that did the original fault of check rinse aid and water led came up because of faulty mains cable or the internal dishwasher fault cause the mains cable to get hot and become short. I mean each time I was testing the dishwasher the plug was getting hot and slowly slowly it may have caused the short inside the plug. Well I think the correct move would be to get the working mains cable first and then see what happens. Thanks
Rjnkanwal
One more question, can earth and positive be short and still work and cause heat without blowing up the fuse or it will blow up the fuse the second they become short.
Hi Dave
Fixed the mains lead, plugged it into the dishwasher and before switching it on I checked for short within the appliance. Positive and negative terminal are showing short with 82 ohm resistance. With my limited knowledge about electricity I am little baffled. The knowledge says it should have been a complete open circuit which it isn’t, indicating short. Now if short then it should read zero on multimeter continuity test, instead it is showing resistance of 82 ohm. Do you think that power module is faulty or the heat pump?
Thanks
RjnkanwalOk I have now full working plug and mains lead without any short. I just removed the main power module and then tested it by plugging in each connection to find the short. There was none. Just playing with the power modules the short has disappeared.
Now I am back to the main fault, check water and rinse aid lights still flashing. Searching on Google indicates 2 faults, one with the main power module and the other with heat pump. Is there a test which I can do on the main power board to see if it is working or faulty.
Also if I need to access the heat pump, do I need to remove the bottom panel and how to undo the bottom panel please.
Thanks
Rjnkanwalwow you have had a busy day lol
no there are no tests you can do on the module and bosch tech is hard to find
you you can remove cover under the door and access heat pump but if its just a faulty heater they normally dont cause a fault it just stops heating
Dave
I was off today and off until the weekend, so decided to have a go myself. Saw a video on YouTube about Bosch heat pump. The guy showed how to test heat pump. So tested the resistance between two connectors next to earth and it is reading 20.9 ohms. He mentioned 20 ohms. I think I can say 0.9 ohm could be due to monitor accuracy or an error in my measurement. Well I can say that heat pump is working. Now back to square one.
Can someone please advise what possible faults can be when check water and rinse aid lights are flashing. There is no noise of anything turning on, the dishwasher seems completely dead.
ThanksThe time the check water and rinse aid lights start flashing, the dishwasher was in the middle of 29 minute quick wash cycle. Any info on possible faults will be helpful. Thanks
Hi Dave
I think you can help me on this. I inspected the main control board for any possible burn out or damaged component. There is a resistor, possibly 100 ohm which seems to be damaged. It’s coating is flakey and just like paint it is coming off, revealing the coiled wire underneath. It is reading open circuit. I saw another post where you suggested to replace this resistor along with tiny switch TNY264GN part. I just need a little bit more advice about this resistance to order the correct part. There are a lot of different type of resistances. To me it looked like wirebound through hole resistance. Am I right? Can you please advise? I gather from the other post that it is a 3w 100 ohm resistor but don’t know which type it is. Thanks
Regards
Raj100ohm 3 watt fusible resistor
when this and the chip blow you will get no power at all on the display
DaveDon’t know about the chip? are you talking about TNY 264 GN or some other chip.
The register is definitely faulty. It is open circuit. I still have led flashing and apart from this, there is nothing on the display. I had almost ordered the replacement control module, direct from Bosch for £120 when I saw your other post from February and I decided to try the repair. If it didn’t work then no problem as parts are cheap. Thanks.
Regards
Rajwell as you say you cant lose much and i do a lot of these chips, did a zanussi last week same fault
but all the ones i do are totally dead until repaired. some modern units do use a double power supply to get under the energy legislation that limits power usage when in standby
if it was me i would trace what this resistor feedsDave
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