JMQ A7 PLUS Instruction Manual page 21

Abnormal
communicatio
n: The
communicatio
n between the
lower control
and the
E1
electronic
watch is
abnormal
after
power-on.
The lower control stops and enters the
fault state.
electronic watch displays the fault code
and the buzzer sounds 3 times.
Possible reason: The communication
between the electronic control and the
electronic watch is blocked. Check each
connection of the electronic watch to the
lower control communication line to
ensure that each core is fully inserted.
Check if the cable between the electronic
watch and the controller is damaged and
replace the cable.
20
Can not run up. The