Husqvarna Automower 420 Workshop Manual page 49

Messages
Number Message
INTERNAL DIAGNOSTICS
0 No message
4 Loop sensor problem,
front
5 Loop sensor problem,
rear
18/19 Collision sensor prob-
lem rear/front
32 Tilt sensor problem
33 Mower tilted
27 Settings restored
28 Memory circuit prob-
lem
38 Electronics problem
1191 - 001 -
Cause
Indicates that no message is stored.
The cabling to the sensor circuit board
is faulty or has come loose.
The front loop sensor circuit board is
faulty.
The main circuit board is faulty.
The product has become stuck.
The body can not move freely around
the chassis.
The body is not properly secured in the
rubber dampers.
One of the collision sensor magnets is
missing or inverted.
The tilt sensor has incorrect values.
The product is tilted more than the
maximum angle.
User settings failed to save and the
product has been reset to factory set-
tings.
Resetting settings has failed.
Communication problems with the cut-
ting system.
Action
Check the levels for the A signal. Refer
Tools - Info - Loop on page 10 .
to
Check the levels for the A signal. Refer
Tools - Info - Loop on page 10 .
to
Free the product and rectify the reason.
Remove dirt or foreign objects between
the chassis and the body to make sure
that the body can move freely around
the chassis.
Check that the rubber dampers are
properly attached in the body and in
the chassis.
Check the magnets. Refer to
place the front collision circuit board on
page 31 and To replace the rear colli-
sion circuit board on page 32 .
Calibrate the tilt sensor. Refer to
- Calibrate on page 14 .
Replace the main circuit board. Refer
To replace the main circuit board on
to
page 28 .
Move the product to a flat area.
If the fault occurs repeatedly, program
the product with the most recent main
Firmware on page
program. Refer to
16 .
If the fault occurs repeatedly, even us-
ing the most recent main program, re-
place the main circuit board. Refer to
To replace the main circuit board on
page 28 .
Program the product with the most re-
cent main program. Refer to
on page 16 .
Replace the main circuit board. Refer
to To replace the main circuit board on
page 28 .
Restart the product by switching off the
product, wait for 10 seconds and then
switch on the product.
Replace the main circuit board. Refer
To replace the main circuit board on
to
page 28
Update the firmware via Autocheck.
Troubleshooting - 49
To re-
Tools
Firmware