Husqvarna Automower 420 Workshop Manual page 55

Symptom
The product does not react
when pushing the STOP but-
ton
The product does not react
when the hatch is closed.
8.2.2 Symptoms during searching
Symptom
The product runs, but the
blade disc does not rotate
The product does not find the
guide wire when it is searching
for the charging station.
8.2.3 Symptoms during docking
Symptom
The product detects the F sig-
nal, but cannot dock
The product drives straight in-
to the charging station
1191 - 001 -
Cause
An object or dirt under the STOP button.
Faulty micro switch in the STOP button.
Cause
The product is searching for the charging
station. The blade disc does not rotate
when the product is searching for the
charging station.
The guide loop is broken.
Cause
Dirt/leaves/grass in the charging station
is preventing the product's charging strip
from making contact with the charging
station's charging strip.
Malfunction in the charging station's cir-
cuit board or in the F-wire.
N signal from the anntenna plate is faulty. Check N signals. Refer to
The cables for the charging strips in the
product are not connected or connected
incorrectly.
The cables for the contact strips in the
charging station are not connected or are
connected incorrectly.
The product cannot detect the F field and
therefore does not turn in front of the
charging station.
Action
Remove the object or clean under the
STOP button.
Replace the STOP button. Refer to
replace the lock kit, STOP sensor and
STOP button 420/440/430X/450X/
430XH/450XH on page 26 .
Action
This behaviour is normal and no action is
required.
Check the guide signal, as well as the
settings for following the guide wire. Re-
Tools - Info on page 10 .
fer to
Action
Clean the charging station.
Replace the charging station's circuit
To replace the circuit
board. Refer to
board in the charging station on page 39 .
Loop on page 10 .
Check that the cable lugs for the charg-
ing strips are intact and properly connec-
ted. Make sure that the correct cable is
connected to the right charging strip. Plus
and minus must be correctly connected.
To replace the charging plates
Refer to
on page 33 .
Check that the cable lugs for the contact
strips are intact and properly connected.
Make sure that the correct cable is con-
nected to the right charging strip. Plus
and minus must be correctly connected.
To replace the contact plates in
Refer to
the charging station on page 39 .
Check the LED on the charging station
and the instructions about how to trouble-
shoot the loop signal. Refer to
nal on page 56 .
Troubleshooting - 55
To
Tools - Info -
Loop sig-