On the covered Brother electronic sewing machine, F3 means Brother's service table, as Sears PartsDirect publishes it, lists this code as: key pressed continuously with power on. Press each stitch selection, length and width key in turn and see whether any stays down.
Differential
Likely causes of “Brother electronic sewing machine code F3”, and how to tell them apart
- 1
A stitch key is stuck down
What separates it F3 shows as soon as the machine is switched on and it refuses to start
How to confirm Press each stitch selection, length and width key in turn and see whether any stays down
- 2
Dust or thread under a key edge
What separates it The key feels sticky or slow to spring back
How to confirm Look under the key edges with a flashlight
- 3
A key panel that has failed
What separates it Several keys feel odd or never spring back
How to confirm The key panel is replaced
- 4
A faulty operation board
What separates it No key is stuck but F3 stays on the display
How to confirm The operation circuit board is replaced
- 5
A fault on the main circuit board
What separates it The first two parts were replaced and the code stays
How to confirm The main board is replaced last
Before you touch a setting
Record this first — changing settings destroys the evidence
- That F3 appears at power-up and the machine will not sew
- Which keys feel stiff, sticky or slow to return
- Whether the machine was recently cleaned, oiled or knocked
- The model number
Try in this order
0 of 7 completedCorrect only the documented fault domain
ReversibleThe F3 code appears when a stitch selection key, stitch length adjustment key or stitch width adjustment key is stuck. Attempt to release the stuck button. Replace the key panel if you can't release the stuck key. If no keys are stuck, replace the operation PCB assembly. If the problem persists, replace the main PCB assembly. Parts named: key panel, operation PCB assembly, main PCB assembly.
Switch off and unplug
ReversibleWait a minute so that the machine's control resets completely.
Press each key in turn
ReversibleStitch selection, stitch length and stitch width keys must all spring back when released.
Clean around the keys
ReversibleUse a soft brush to remove lint and thread from the edges of the keys.
Switch on without touching anything
ReversibleKeep your hands off the panel as the machine starts and see whether F3 appears.
Release a stuck key
ReversibleIf one key stays down, press it and wiggle it gently until it springs back.
Take it to a dealer
ReversibleIf no key is stuck, the key panel or the operation board is replaced by a technician.
Model-specific
What is true of this model and not of its siblings
- The code on this page
- F3, a key pressed continuously with the power on.
- Parts involved
- The key panel, the operation board and the main board.
- Care
- Keep lint out from under the keys by brushing them each time you clean the machine.
Stop boundary
When this stops being a self-service repair
- !If no key is stuck and F3 stays, take the machine to a Brother dealer
- !Do not force a key that will not release or open the case with the machine plugged in
- !Unplug the machine before cleaning around the keys
Evidence ledger
Sources behind this answer
Exact questions
Common questions
What does F3 mean on a Brother electronic sewing machine?+
Brother's service table, as Sears PartsDirect publishes it, lists this code as: key pressed continuously with power on.
Is F3 serious?+
Often it is only a stuck key, which costs nothing to fix once it is released.
Can I clean under the keys myself?+
Yes, gently and with the machine unplugged, using a soft brush and no liquids.
What if no key is stuck?+
Then the operation board or the key panel is faulty and a dealer must replace it.
Will it harm my sewing?+
The machine will not sew until the code clears, but the fault itself does not damage your work.