Sunday, January 7, 2024

Hack the Hotpoint dish washer when looping forever 31 min before the end

 Background

I paid 309.98€ (incl.  shipping) for a HOTPOINT LFF8M116XEU dish washer in june 2018:


This dish washer has a nice design but after 2.5 years (out of warranty), it started to loop forever 31min before the end of a program, e.g. the washing program never ended!

The root cause

The guilty part was the door opened sensor (I had door opened detection during the washing cycle).

The door get deformed due to heating and then the sensor detected the door was opened and the dish washing program loop then forever 31min before the end of the program.

 It is a simple contactor that cost less than 1€... but this sensor is in the lock system, so you have to replace the whole lock system:


This plastic piece costed in beginning of 2021 more than 40€ including shipping e.g. more than 12% of the price of the dish washer.

Now (January 2024) it seems the price is lower (around 24€ incl. shipping), anyway I doubt it will solve the issue if you change it.

Materials needed for my (ugly) hack

My (ugly) hack

My parents' dish washer did not had door opened sensor in the 90s. 

Dish washer does not consumes that much water, so even if the dish washer starts with the door is opened you will not have that much water in your kitchen...

My ugly hack was to cut the 2 wires going to this sensor and solder them together. Put thermoresistant Tube Heat Shrink on this soldering (to isolate) and your dish washer will never loop forever before the end of a program.

Conclusion

This ugly has solved my issue with a program looping forever before the end with no issue (hack done in February 2021 and no issue so far in almost 3 years)

Anyway you have to keep in mind the dish washer will start even if the door is opened (will put water on the floor).



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