How do you put bosch 300/500 dlx into diagnostic mode

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Service Manual
https://applianceassistant.com/ServiceManuals/bosch_shi_shu_shv_dishwasher_1998.pdf

Diagnostic Mode

How to Troubleshoot the Test Cycle on a Bosch Dishwasher

Hunker https://www.hunker.com > ... > Dishwashers
Bosch dishwashers come with a built-in test cycle option, known as the Bosch dishwasher diagnostic mode, to help identify what's going wrong. The test cycle ...

https://www.google.com/search?q=bosch+shu5312+diagnostic+mode

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Have you checked for a kinked hose or plugged Garbage disposal - if new disposal make sure the plug is punched out

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Here is what worked...
1. Set the knob to off.
2. Hold down both the Spin Selector button and the Allergy Rinse button simultaneously.
3. While holding these two buttons down, rotate the knob one click to the left, to the "cold" position.
4. At that point, the display will show a diagnostic code and the unit will enter a self-test mode. In my case, the solenoid latch started clicking repeatedly. I pressed the Spin Selector button once or twice, which resulted in the display of new codes and then the release of the latch.
5. I set the knob back to off, and the washer now appears to be operating.
6. You're done.

you need to reset the high temp sensor. its in the back next to the vent. you might be able to use a long screw driver and push it in. Mine is just about an inch above vent and on the right side. Use a flashlight to look in and you should be able to see it.

A code E27 means a problem with the door lock. Try unpluging the machine for an hour and see if it resets the lock.

If not remove the cover on the lower right corner you will see a white plastic pull cord. Pull the cord and pull open the door. If that doesn't reset the door lock you will need to replace the lock.

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I had a Bosch DLX series dishwasher that had multiple problems.

First, it had greyish water in the bottom and pushing the power button did not turn on any lights. it had mostly finished a cycle, but not quite. my first thought was to clean it out. i sponged out all the water and removed and cleaned out the filters from the bottom which were all quite nasty. i found food, tiny bones, etc. I cleaned it out and that did nothing but was still probably the cause of the problem. I called Bosch tech support and asked about areset switch. There is none. They told me to switch off the circuit breaker for 30 MINUTES to reset everything. I did that which did not fix the problem.

I then examined the connector wires (connecting the electric to my house wiring) which are in the front under the kick plate, and discovered that they had MELTED! The wiring supplied by Bosch was stranded wire, and my home wiring is solid core. i trimmed the burnt stuff and reconnected it with new wire nuts. if this happens again i plan to disassemble the dishwasher's electric and replace the stranded wire with the good stuff.

That restored the electric and the lights and display. i then ran a test cycle and it seemed to just hum. my guess after googling a bit was that the float was stuck in the up position, and it was trying to drain. This site http://www.applianceaid.com/boschDW.html told me how to run the test mode.

"To start test program, press and hold both POWER SCRUB PLUS and REGULAR WASH program buttons, then turn unit on by pressing ON/OFF button. When program buttons are released, lights above them will flash. To end test program, press ON/OFF button."

The test mode tested out all functions which I think wound up reseting the float switch which actually fixed the rest of it.

Faulty inlet valve or water in the bottom tray which will activate the float swich and pump out any water. See that this moves up and down freely. Turn electrics off first.