{"id":354027,"date":"2026-09-13T22:46:28","date_gmt":"2026-09-13T17:16:28","guid":{"rendered":"https:\/\/stitchpartner.com\/?p=354027"},"modified":"2026-09-13T22:46:32","modified_gmt":"2026-09-13T17:16:32","slug":"jack-sewing-machine-error-codes-all-models","status":"publish","type":"post","link":"https:\/\/stitchpartner.com\/hi\/jack-sewing-machine-error-codes-all-models\/","title":{"rendered":"JACK Sewing Machine Error Codes: Complete Guide (All Models)"},"content":{"rendered":"

Quick Answer<\/h2>\n

JACK doesn’t use one error-code system across its whole range \u2014 the code on your panel depends on which control box your machine has. We’ve researched every JACK control box family we could find documented (official manuals plus JACK’s own maintenance videos) and grouped them below by model, so you can jump straight to your code without reading through a scheme that doesn’t apply to your machine.<\/p>\n

Three JACK sewing machine control box families cover almost every industrial model in regular use in India: the F4\/F5\/F6 direct-drive lockstitch range, the A4\/K4\/A5 auto-trimmer range, and the C4\/E4 overlock range. A smaller fourth family covers JACK’s electronic bartack\/pattern machines. Find your model below.<\/p>\n

Step 1: Find Your Machine’s Error Code Family<\/h2>\n\n\n\n\n\n\n\n\n
Your Machine<\/th>\nWhat Your Code Looks Like<\/th>\nFull Guide<\/th>\n<\/tr>\n<\/thead>\n
JACK F4, F5, F6 (direct-drive lockstitch)<\/td>\nSingle letter + digit: 0F, E1, E5, EA, Eb<\/td>\nJACK F4\/F5\/F6 Error Codes Guide<\/a><\/td>\n<\/tr>\n
JACK A4, K4, A5, ZB-A4F, ZB-A2S (auto-trimmer lockstitch)<\/td>\nTwo-digit “Err-” prefix: Err-01, Err-13, Err-23<\/td>\nJACK A4\/K4\/A5 Error Codes Guide<\/a><\/td>\n<\/tr>\n
JACK E4, E4S (C4 control box overlock)<\/td>\nLetter code (E1-Ed) or newer numbered code (Error 01-26)<\/td>\nJACK C4\/E4 Overlock Error Codes Guide<\/a><\/td>\n<\/tr>\n
JACK JK-T781E (electronic bartack\/pattern)<\/td>\nSingle letter + digit: E1, E3, E9, E11<\/td>\nCovered in the C4\/E4 guide’s bartack section<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Not sure which family your machine belongs to? The quickest check is the shape of the code itself \u2014 a two-digit code with “Err-” in front means the auto-trimmer family, while a bare letter-and-digit code means either the F4\/F5\/F6 lockstitch scheme or the C4\/E4 overlock scheme, depending on whether your machine is a single-needle lockstitch or an overlock\/serger.<\/p>\n

Step 2: Every JACK Error Code We Found, in One Table<\/h2>\n

This is a quick-lookup master list. It’s not a substitute for the detailed guides above \u2014 those explain the fix for each code \u2014 but if you just need to check what a code means right now, search this table for it.<\/p>\n

JACK F4\/F5\/F6 Lockstitch Codes<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Code<\/th>\nMeaning<\/th>\n<\/tr>\n<\/thead>\n
0F<\/td>\nSleep mode after ~30 min idle<\/td>\n<\/tr>\n
E1<\/td>\nMotor stuck \/ plug loose<\/td>\n<\/tr>\n
E2<\/td>\nMotor controller overloaded<\/td>\n<\/tr>\n
\u09084<\/td>\nMotor Hall signal \/ needle position fault<\/td>\n<\/tr>\n
E5<\/td>\nNeedle locator signal fault<\/td>\n<\/tr>\n
E6<\/td>\nSpeed controller signal abnormal<\/td>\n<\/tr>\n
E7<\/td>\nHead safety switch triggered<\/td>\n<\/tr>\n
EA<\/td>\nSoftware over-current<\/td>\n<\/tr>\n
Eb<\/td>\nSystem over-voltage<\/td>\n<\/tr>\n
EC<\/td>\nSystem under-voltage<\/td>\n<\/tr>\n
EJ<\/td>\nCurrent detection circuit fault<\/td>\n<\/tr>\n
EZ<\/td>\nReverse-stitch button stuck\/failed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

JACK A4\/K4\/A5 Auto-Trimmer Codes<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Code<\/th>\nMeaning<\/th>\n<\/tr>\n<\/thead>\n
Err-01<\/td>\nHardware over-current<\/td>\n<\/tr>\n
Err-02<\/td>\nSoftware over-current<\/td>\n<\/tr>\n
Err-03<\/td>\nUnder-voltage<\/td>\n<\/tr>\n
Err-04<\/td>\nOver-voltage at shutdown<\/td>\n<\/tr>\n
Err-05<\/td>\nOver-voltage in operation<\/td>\n<\/tr>\n
Err-06<\/td>\nTrimmer solenoid short circuit<\/td>\n<\/tr>\n
Err-07<\/td>\nMotor current-measuring failure<\/td>\n<\/tr>\n
Err-08<\/td>\nSewing motor blocked<\/td>\n<\/tr>\n
Err-09<\/td>\nBrake circuit failure<\/td>\n<\/tr>\n
Err-10<\/td>\nPanel\/control box communication failure<\/td>\n<\/tr>\n
Err-11<\/td>\nNeedle positioning failure<\/td>\n<\/tr>\n
Err-12<\/td>\nInitial motor angle detection failure<\/td>\n<\/tr>\n
Err-13<\/td>\nMotor Hall sensor failure<\/td>\n<\/tr>\n
Err-14<\/td>\nControl board EEPROM failure<\/td>\n<\/tr>\n
Err-15<\/td>\nMotor over-speed protection<\/td>\n<\/tr>\n
Err-16<\/td>\nMotor reverse rotation<\/td>\n<\/tr>\n
Err-17<\/td>\nPanel EEPROM failure<\/td>\n<\/tr>\n
Err-18<\/td>\nMotor overload<\/td>\n<\/tr>\n
Err-23<\/td>\nMotor blocked with encoder failure<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

JACK C4\/E4 Overlock Codes<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Code<\/th>\nMeaning<\/th>\n<\/tr>\n<\/thead>\n
E1<\/td>\nMotor stuck<\/td>\n<\/tr>\n
E2<\/td>\nMotor controller abnormal<\/td>\n<\/tr>\n
E3<\/td>\nParameter save abnormal<\/td>\n<\/tr>\n
\u09084<\/td>\nMotor Hall signal abnormal<\/td>\n<\/tr>\n
E5<\/td>\nNeedle position signal abnormal<\/td>\n<\/tr>\n
E6<\/td>\nSpeed governor abnormal<\/td>\n<\/tr>\n
E7<\/td>\nCurrent detection circuit fault<\/td>\n<\/tr>\n
EA<\/td>\nHardware over-current<\/td>\n<\/tr>\n
Eb<\/td>\nSystem over-voltage<\/td>\n<\/tr>\n
EC<\/td>\nSystem under-voltage<\/td>\n<\/tr>\n
Ed<\/td>\nBrake resistor protection fault<\/td>\n<\/tr>\n
Error 02\/03\/07\/09\/11\/12\/13\/19<\/td>\nExtended series on newer C4 boards \u2014 see full guide<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

JACK JK-T781E Bartack\/Pattern Codes<\/h3>\n\n\n\n\n\n\n\n\n\n\n
Code<\/th>\nMeaning<\/th>\n<\/tr>\n<\/thead>\n
E1<\/td>\nPower module error \/ abnormal over-current or over-voltage<\/td>\n<\/tr>\n
E3<\/td>\nStepper motor communication abnormal<\/td>\n<\/tr>\n
E6<\/td>\nStepper motor sensing abnormal<\/td>\n<\/tr>\n
E7<\/td>\nLoose plug, position signal fault, blocked head, or heavy fabric<\/td>\n<\/tr>\n
E9<\/td>\nPositioning signal abnormal<\/td>\n<\/tr>\n
E11<\/td>\nNeedle signal can’t output at startup \u2014 positioner fault<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

What Almost Every JACK Error Code Comes Down To<\/h2>\n

Across every one of these control box families, the same handful of root causes explain most fault codes: a plug or sensor connector that’s worked loose (motor, encoder, positioner, pedal), a machine that’s overdue for oil and is drawing more current than normal, a genuine mechanical jam that looks electrical until you turn the hand wheel by hand, and mains voltage that’s fluctuating outside the control box’s rated range. Whatever code your JACK machine shows, checking these four things first solves the large majority of cases before you need a technician.<\/p>\n

The exceptions are the codes tied to a specific sensor or board failure \u2014 Hall sensor faults, EEPROM read\/write failures, current-detection circuit faults \u2014 which are genuine part-level failures rather than loose connections, and are covered part-by-part in each detailed guide above.<\/p>\n

Genuine JACK Spare Parts for These Fixes<\/h2>\n

These are the parts behind most of the fixes across all three control box families:<\/p>\n