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Alarm troubleshooting

1,997 real controller alarms with step-by-step diagnostic trees — filter by brand and unit, or type the code straight from your screen.

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All 1,997Fanuc 1,044Mitsubishi 692Siemens 261
14 alarms · sorted by code · page 1 of 1
AL-01

Alarm AL-01 (Motor overheat) Diagnostic Tree

Fanuc·Models 6s/16s/26s5 steps→AL-02

Alarm AL-02 (Excessive deviation of speed) Diagnostic Tree

Fanuc·Models 6s/16s/26s5 steps→AL-03

Alarm AL-03 (+24 V fuse is blown / Defective regenerative circuit) Diagnostic Tree

Fanuc·Models 6s/16s/26s2 steps→AL-04

Alarm AL-04 (Input fuse blown / Input power open phase) Diagnostic Tree

Fanuc·Models 6s/16s/26s3 steps→AL-05

Alarm AL-05 (Control power supply fuse blown) Diagnostic Tree

Fanuc·Models 6s/16s/26s2 steps→AL-07

Alarm AL-07 (Excessive speed) Diagnostic Tree

Fanuc·Models 6s/16s/26s2 steps→AL-08

Alarm AL-08 (High input voltage) Diagnostic Tree

Fanuc·Models 6s/16s/26s4 steps→AL-09

Alarm AL-09 (Excessive load on main circuit section / Unit overheat) Diagnostic Tree

Fanuc·Models 6s/16s/26s2 steps→AL-10

Alarm AL-10 (Low input voltage) Diagnostic Tree

Fanuc·Models 6s/16s/26s3 steps→AL-11

Alarm AL-11 (Overvoltage in DC link section) Diagnostic Tree

Fanuc·Models 6s/16s/26s3 steps→AL-12

Alarm AL-12 (Overcurrent in DC link section) Diagnostic Tree

Fanuc·Models 6s/16s/26s2 steps→AL-13

Alarm AL-13 (CPU alarm) Diagnostic Tree

Fanuc·Models 6s/16s/26s2 steps→AL-14

Alarm AL-14 (ROM is defective) Diagnostic Tree

Fanuc·Models 6s/16s/26s2 steps→AL-15

Alarm AL-15 (Option circuit fault) Diagnostic Tree

Fanuc·Models 6s/16s/26s3 steps→