How can I run a test/diagnostic for a Bosch dishwasher model SHX4ATF5UC?

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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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Long running time on a Bosch dishwasher is almost always a blown solder joint at the heater relay on the control board. You can resolder the joint, replace the relay or replace the control. Control board part number is 00266746.

Are the instructions on how to run the diagnostic test listed in the manual? FYI, I couldn't run the test on my Bosch DW because it was just too broken. Over the years the dishwasher essentially fried its own circuit board with excessive heat, which I learned is a problem common to Bosch DW's. Bosch told me the lifespan of my model was 10 years; mine was 11 years old (but was repaired once or twice). I replaced it with a Miele; no problems yet after 4 1/2 months.

this sounds like flow sensor failure,it it fails machine will either not fill up or fill and drain without washing its a cheap part to replace and is fitted downstream of inlet valve behind l/h/s side panel either attached to inle hose or heat exchanger.

Here is an excerpt from "Bosch Dishwasher Troublesoooting".

Running a Test Cycle
Bosch dishwashers have a test cycle which can be run as a troubleshooting measure. The method to run this test cycle is similar across the Bosch dishwasher range so if your dishwasher features seems different from those described below then try experimenting, as the process is fairly straight forward and will be very similar. Bosch dishwasher model numbers are usually found around the top or lip of the door. One of the most common differences between dishwasher models is simply the names of the buttons. For example in the first example below, POWER SCRUB PLUS and REGULAR WASH may be called WASH and ECO depending on your dishwasher model and the country you are in. The other key difference is whether your dishwasher has a display panel (which can display error codes) or not (in which case a program light will illuminate to tell you the fault.
To run the test cycle hold down the POWER SCRUB PLUS and REGULAR WASH buttons. Whilst held down press the ON/OFF button. The lights above them should flash. Now you can check the status of each dishwasher program by pressing its button. Now you can run the full test cycle = Press the POWER SCRUB PLUS and REGULAR WASH buttons again. The dishwasher will start up and when the cycle has ended one, if you have no display panel on your dishwasher model the indicator lights will illuminate if a malfunction was detected as follows -
CLEAN - A temperature sensor fault. If this is the case then the test cycle will be very short as the dishwasher will terminate the test once it's been detected.
RINSE/DRY - A water sensor/filling fault. If this is the problem then the test cycle will not complete as the dishwasher cannot detect the right level of water, the dishwasher will just keep filling and draining again.
WASH - A heating fault. Check your heating element.
If you do have a display panel on your Bosch dishwasher then after the cycle is complete an error code will be shown if a fault has been detected. The error codes are as follows -
0 - No errors have been detected.
1 - A water sensor/filling fault.
2 - A heating fault.
4 - A water filling fault. This can also appear as F on the display during a normal cycle.
8 - A temperature sensor fault.
When troubleshooting your Bosch dishwasher, running the above test cycle is a good start in diagnosing the problem and should give you an idea of where the problem lies with your Bosch dishwasher and what fixes and repair are in order. Our general troubleshooting page will give you some ideas on other things to check on your dishwasher. Good luck!

You seem to have inadvertently put it into the test sequence. Try pressing the two reset button simultaneously (usually the reset buttons are 1st and 3rd from left each with a dot underneath, if this does not work, press the button between the two resets (2nd button) P1 should come on then press the right reset button. The unit should run through a test cycle for approx 20mins and eventually reset the module, this is indicated by 0 in the display. Please repost if further assistance required.

Resoldering the relay, regardless of how proficient one is at soldering, will not be a long term solution. The melted/burned solder joint is a secondary result of the initial failure, which is the relay itself. There is a solution that is more permanent and less costly than replacing the control with a new one.
Do a search for Bosch 266746 control and you will locate someone who has studied the problem and found a safe, long term solution.

Hello,

Welcome to FixYa.

I would first run a diagnostic to see what error is presented and in turn will direct which way to focus the repair.

Try this and then let me know what you find aa a result...

This diagnostic posted below should guide you, let me know if it isn't clear or you don't understand something.

Bosch SHE44C06UC
The dishwasher continues to run...I followed instructions and performed the diagnostic...the light above the quick wash was solid, the light above the rinse/hold was flashing...the code displayed in the cycle countdown window was P0...now assuming the machins isn't "pissed-off"..can you help-

Bosch dishwasher all cycles start at 2H and get hungup on 1 min.