Here is my tale:
Our Bosch Washer failed at the end of the wash cycle with the door failing to open. The door lock now makes a buzzing sound when the machine tries to lock or unlock the door. It did not buzz before this failure occurred. When the machine tries to unlock the door the door lock will buzz three times in a row then pause for a bit then buzz three times in a row and continue...
The door manual release did not work. Eventually we were able to get the door open by pulling on the door when the machine buzzed the door lock. Now we had access and removed and disassembled the lock. It was actually quite easy to take apart and put back together. The solenoid return/centering spring had broken it two possibly jamming the manual lock release. Everything else looked fine. I was able to repair it by stretching one of the longer remaining spring halves and reinstalling all the parts. It all appeared to work perfectly after reassembly including the manual release. I reinstalled the lock and the problem continued.
We can run the machine and everything works fine except for this issue. We are opening the door with the manual release cord. I then ordered a new door lock and replaced the door lock and the problem continues. I replaced the control module and the problem continues!
I obtained the service manual for this model. I checked the wiring between the door lock and the control module with a DVM and it is fine with good continuity. I checked the door lock switching with a DVM and the coil. The switches are working fine and the coil measures 120 Ohms between the outer terminals and about 60 ohms between each outer terminal to each inner terminal. I checked the drain pump and cleaned it out (removed two plastic pieces from a child’s ruler that had found their way to the pump). The pump seems fine, looks fine, and pumps fine. The problem continues!
I have run the service fault code menu several times. Mostly ER04 comes up (the service manual indicates “Door Lock Triac or Control Module Failure”). The Triacs on both control modules (Original and replacement) look fine with no burns, burned parts, or visible board damage. Sometimes ER01 door lock comes up. When running the machine during a wash sometimes it displays on the main panel after it tries to lock or unlock the door “Door Can’t Be Locked” or “Door Can’t be Unlocked” (I can’t remember which it is at this time… I didn’t write it down. Sometimes it just says “Error”.
Once during running the service fault menu test it came up with ER015 “Pressure Sensor Gives Failure Voltage Level”. This only has shown up once. I think I read a post on anther Bosch Washer Model that the Analog Pressure Sensor failure can appear as a “Door Lock” problem. Anyone with ideas or thoughts on what is really wrong? Is it the pressure sensor that is causing the problem?