HELP PLEASE **IMPORTANT*** Bosch Dishwasher LED Lights and machine not turning on

Dishwasher Repair
1

Brand: BOSCH
Model Number: SHC8PT55UC2
Main Symptom: Interior (not floor) LED Light not coming on
What happens & when: Won’t run a cycle- Rapid flashes RINSE and SANITIZE at same time- I think this means there is a FAULT. NO NOISE. Nothing. The Rinse aid compartment is clean and full.

I am following up from previous posts. I could really need some help please. Specifically WHERE do the two (2) red LED (not the red floor light), lights plug in?

I have attached three (3) pics of my control modules. (1) The Bosch tech just left me a new one, when doing the cord recall. *(2) One that I bought one previously on EBay. And my (3), my original module. Ironically, it was probably fine all along. They are ALL doing the same thing. Flashing 2 red lights. When the tech was here it was just running, then beeping. He thought it pointed to the Circ. Heat pump. After I put in the new pump, I got the new issue- flashing lights.

The LED plug pulled out but I did not see where it goes. It fits on top of the module, but I don’t think that is it. Less than 1 VDC (0,24v) and the contacts don’t line up.

I did test the pins, on the Power Supply exactly as directed. I believe you said at X2, pins 1 and 3 and I DID get ~16 VDC. Seems like a good thing~!

ANY help on why it won’t turn on- and where to plug in the led strip (labels on them states: Emotional Lights, EL II) They are on top, and a flat 1" paper like cable wraps around the side and down- to near the module area.

Error Code (if any): NONE
Parts or tests already tried: Water Pump; Circ.Heater Pump. Inlet Solenoid. Diverter Pump and 3 main control boards.

I REALLY need to get this fixed so if ANYONE has any insights, even random ideas, please share. I feel I have tried nearly everything. Could it be the Power Supply or the Touch Screen? They seemed to work before I reinstalled, what everyone says is the CORRECT, and pricey Cir./Heat Pump, from Bosch.

Photos / video link:

20260504_204942
20260504_2049421920×2560 385 KB

20260504_205001
20260504_2050011920×2560 445 KB

20260504_204938
20260504_2049381920×2560 406 KB

2

Typical reasons for the flashing lights are: Issue with the rinse aid dispenser, the temperature sensor, the door latch assembly or the control board. This could also mean the unit is hung up in a cycle. Start with a hard reset…turn off the power for approximately 10 minutes and then restart the machine. If it persists then each of the above listed components would need to be checked, replacing any that fail testing.

3

Thanks Brad. I believe that the Rinse aid dispenser is perfectly fine. As I stated in my detailed post, it is clearly in a FAULT MODE. I have been working on this for over a week and tried ALL the basics and even tested some things with a meter.

I have a few questions please that might help me narrow things down a bit…

Where is the TEMP SENSOR please?

I have tried RESETTING 30 times- no luck. Unplugged overnight- several times.

I replaced the Main Module 3 times… per my post. Included PICS of all modules. Did NOT change the Power SUPPLY or touch control panel (have literally changed nearly everything else!)

I also tested the Power Supply module in the door, per the other tech in here suggested- at X2, pins 1 and 3. I AM getting ~16 volts DC.

Can you provide a full wiring schematic? The one the last person sent me was cut off- in half.

I REALLY need to know where the TWO RED wires for the INSIDE LED’s connects to please. Can you tell by looking at any wiring diagrams?

THANKS!