Yamaha PW-SE series Original Instructions Manual page 52

TROUBLESHOOTING
Symptom
The assist mode lamp
lights up in red, the
main riding display
and "ER" are
displayed alternately,
and an error
description is
indicated in the
function display.
Displays alternately
Error displays
The display unit shuts
down immediately
(approx. 4 seconds
later) after switching
the power on.
Traveling range has
decreased.
Check
Are the bicycle's battery
pack connection
terminals dirty?
Are you fully charging
the battery pack?
Are you using the
system under low-
temperature
conditions?
Is the battery pack worn
out?
49
Action
The problem occurs in the e-Bike
Systems. Turn off the power and then
turn it on again.
If the problem cannot be solved, have
your bicycle inspected by a dealer as
soon as possible.
Remove the battery pack, clean the
bicycle's terminals with a dry cloth or
cotton swab, and then install the battery
pack again.
Charge the battery pack until full (F).
Normal traveling range will be restored
when the ambient temperature rises.
Additionally, storing the battery pack
indoors (in a warm location) before use
will improve traveling range under cold
conditions.
Replace the battery pack.