Trouble Shooting; Trouble Shooting Guide - Bernina Bernette 25 Instruction Manual

Trouble shooting guide

Before calling for service, check the following items. If the problem still persists, contact the
place of purchase or your nearest authorized dealer.
Problem
1. The machine is not threaded correctly.
2. The thread tension is too tight.
3. The thread is too thick for the needle.
Upper thread
4. The needle is not inserted correctly.
breaks
5. The thread is wound around the spool
pin.
6. The needle is damaged.
1. The bobbin case is not inserted correctly.
Lower thread
breaks
2. The bobbin case is threaded wrong.
3. The lower thread tension is too tight.
1. The needle is not inserted correctly.
2. The needle is damaged.
3. The wrong size needle has been used.
Skipped
stitches
4. The foot is not attached correctly.
5. The machine is not threaded correctly.
6. The presser foot pressure is not strong
enough.
1. The needle is damaged.
2. The needle is not correctly inserted.
3. Wrong needle size for the fabric.
4. The wrong foot is attached.
Needle
breaks
5. The needle clamp screw is loose.
6. The presser foot that is used is not
appropriate for the type of stitch
pattern that you wish to sew.
7. The upper thread tension is too tight.
1. The machine is not correctly threaded.
2. The bobbin case is not correctly
threaded.
Loose
stitches
3. Needle/fabric/thread combination is
wrong.
4. Thread tension is wrong.
1. The needle is too thick for the fabric.
Seam
gather or 2. The stitch length is adjusted wrong.
pucker
3. The thread tension is too tight.
Cause
502020.75.28_021H2D0101_1010_IM_bernette 20 25_EN
Correction
1. Rethread the machine.
2. Reduce the thread tension.
(Lower number).
3. Select a larger needle.
4. Remove and reinsert the needle (flat
side towards the back).
5. Remove the reel and wind thread onto
reel.
6. Replace the needle.
1. Remove and reinsert the bobbin case
and pull on the thread. The thread
should pull easily.
2. Check both bobbin and bobbin case.
3. Adjusting thread tension as described.
1. Remove and reinsert needle(flat side
towards the back).
2. Insert a new needle.
3. Choose a needle to suit the thread.
4. Check and attach correctly.
5. Rethread the machine.
6. Adjusting the presser foot pressure.
1. Insert a new needle.
2. Insert the needle correctly (flat side
towards the back).
3. Choose a needle to suit the thread
and fabric.
4. Select the correct foot.
5. Use the screwdriver to firmly tighten
the screw.
6. Attach the presser foot that is appro-
priate for the type of stitch that you
wish to sew.
7. Loosen the upper thread tension.
1. Check the threading.
2. Thread the bobbin case as illustrated.
3. The needle size must suit the fabric
and thread.
4. Correct the thread tension.
1. Select a finer needle.
2. Readjust the stitch length.
3. Loosen the thread tension.

Trouble Shooting

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Reference
13
17
20
16
13
16
12
12
17
16
16
20
31-32
13
17
16
20
20
31-32
16
31-32
17
13
10
20
17
20
29
17