123
Troubleshooting
Error code 28, CPU/DLCU LOW LEVELS
The DLCU contains a mechanical level monitor which ensures that there
is no water in the machine when the lock opens. To ensure that the level
monitor functions correctly, the mechanical level monitor is compared with
a nominal value generated by the CPU, which is compared with the elec-
tronic level check.
When the water level exceeds the nominal value, a check is made to en-
sure that the mechanical level monitor is switched on, and if not, an error
code is generated.
When the mechanical EWD monitor is switched on during filling, the water
level in the drum must have exceeded the nominal value measured by the
electronic level control.
When the mechanical level monitor is switched of during draining, the
water level in the drum must be below the nominal value measured by the
electronic level control.
Reason:
• Thelevelcontrollercanbedamaged:
• Crosstalkinthelevelcontrollerelectricalsystem.
• Leakageinthelevelcontroller’sairhoses.
• Incorrectnominalvalue,possiblycausedbyaerrorintheelectronic
level controller.
Action:
• Checkthelevelcontrollerfunction.(Switch-onlevel=40mm,switch-off
level=15mmWg)
• Checkthecablesandtheirconnections.Thevoltageacrossthelevel
controllershouldbe0Vwhenthewaterlevelis<15mmWgand5V
when water level is > 40 mm Wg.
• Checkthatthelevelhosesarenotblocked.Blowcleanallthehosesin
the level system.