TROUBLESHOOTING ERROR CODES
SERVICE MANUAL 55
REVISION 04/19, SW: 3.51
Error Code 28
An invalid combination of the mains alarm has been detected. The mains alarm is
not displayed correctly.
Steps Checklist Solution
1 Go to the test menu (alarm test) to
see which one of the overheat safety
switches is not sending a feedback signal
to the I/O board connector J14.
2 Check the switch and cable and the cable
plugs from that specific overheating
sensor and the wire to J14.
Change the plug and repair
the wire, if necessary, and
then test if the alarm has
disappeared.
3 If the error persist, and the feedback
signal to the I/O board is ok.
Replace the I/O board.
Error Code 29
The door sensor is not working properly. Note: the oven does not stop working when
the door is opened. The oven can be used.
Steps Checklist Solution
1 Go to the test menu to see which infor-
mation the computer displays.
2 Check the cable and the cable plugs, and
the test if the sensor is working.
3 Check the magnet on the drip slide. Change the drip slide.
4 - If the magnet works, change
the door sensor, and
remember to calibrate the
door afterwards.
WARNING
The oven does not stop working when the door is opened.
The oven can still be used with caution.
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