Janome DC 3050 - Manual (Page 40)

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The power is turned on with the foot control not
being connected.
The foot control is disconnected while sewing.
Connect the foot control and restart
the machine.
Problems and Warning Signals
If a buzzer sounds and the indicator shows a warning sign, follow the guidance below.
The machine is re-started too soon after it
has halted due to the overload.
Wait for at least 15 seconds to restart.
If threads are jamming, remove
jammed threads.
The machine is malfunctioning due to a
problem in the electronic components.
Contact the service center or the
store from where the machine was
purchased.
Warning signal
Selecting a pattern after buttonhole is completed
with the buttonhole lever still lowered.
The bobbin winder spindle is shifted to the right
for bobbin winding.
Raise the buttonhole lever and re-
select the pattern.
Return the bobbin winder spindle
to the left.
Audible signal
Pip
Pip-pip-pip
Pip-pip-peep
Peep
The buzzer sounds when:
Normal operation
Invalid operation
Buttonhole sewing completed
Malfunction
It is not abnormal that a faint humming sound is coming out from the internal motors.
The pattern selection key area may become warm when the machine has been used for hours.
Problem
Try this