Entering the Diagnostic Mode
(a) Turn the power supply to the dryer on.
(b) Press and hold the Auto Dry down button, then press the Power
The dryer is now in level 0 of the diagnostic mode. After initial entry into the
diagnostic mode, the Start/Pause button operates the dryer as normal. Press
the Auto Dry up or down buttons to scroll through the fault levels.
There are several levels of diagnostics, most of which are used in
development and production. These levels may bring on various LEDs, but
the level of use for the service technician is that of the last fault.
To enter the last fault diagnostics, enter the diagnostic mode as described
above, then press the Auto Dry up button three times. The last fault will be
displayed on the drying progress LEDs.
The manual is here