Candela Error Codes

Service Resource / Error Codes by Brand / Candela

GentleMax Pro and GentleMax Pro Plus

45 faults and 4 warnings, grouped for quick reference. These mappings agree in the two reviewed revisions; coverage of newer software is not established.

GentleMax Pro: 8501-00-2200 Revision D, pages 110–120.
GentleMax Pro Plus: 8501-00-2400 Revision D, April 21, 2022, pages 102–111.

Power, shutter and calibration

F3.1 — Shutter position/actuation failure

F4.2 — Supply communication timeout

F5.1 — Supply outside tolerance

F5.2 — Charging timeout

F5.3 — Discharge-test failure

F6.1 — Calibration energy not reached

F6.5 — Calport switches disagree

Water cooling and warm-up

F7.1 / F7.2 — Water too cold / hot

F7.3 — Circulation or pressure problem

F7.4 — Water-temperature sensor fault

F7.5 — Insufficient water

F9.1 / F9.2 — Water / canister warm-up failure

Cryogen and DCD

F1.1 / F1.2 — Handpiece / canister bubble-sensing test failure

F8.2 — Excessive canister pressure

F8.3 — Handpiece spray-valve fault

F8.4 — Canister temperature-sensing fault

Energy, pulse timing and optical delivery

F10.1 — Slider identification failure

F12.1 / F12.2 — Pulse energy below / above range

F12.3 — Energy ceiling exceeded

F12.4 — Unequal subpulse energy

F12.6 — Pulse duration outside tolerance

F14.1 / F14.2 — 755 / 1064 nm simmer fault

F15.1 / F15.2 — Transmission below / above range

Trigger controls

F13.1 / F13.2 — Finger / foot trigger channels disagree

F13.3 / F13.4 — Finger / foot trigger remains activated

Circuit, software and communication faults

F18.1 / F18.2 / F18.3 — Energy / water / DCD calibration fault

F19.1 — Triggering fault

F19.3 / F19.4 — Laser / head power fault

F19.5 — Discharge-test failure

F21 — Incomplete update

F23 — One-wire network fault

F24 — Interface communication fault

F26.1 / F26.2 — Internal software fault

Warning codes

10.2 — Delivery assembly disconnected in Ready

10.3 — Slider removed in Ready

10.4 — Fiber connection absent in Ready

17 — Handpiece cryogen bubbles

Using this reference

Match the exact model, software version, full screen message and applicable manual. A code identifies a detected condition and does not by itself diagnose a failed component. Perform only checks permitted by the exact operator manual and your training. Persistent faults or unresolved concerns require qualified assessment before clinical use resumes.

Request equipment service

Send the model, serial number, full code, handpiece, software version, when the fault occurs and checks already completed. Exclude patient identifiers from photographs.

Contact VMS for equipment service | 833-286-7669

Reference documents

GentleMax Pro operator manual — 8501-00-2200 Rev D

GentleMax Pro Plus operator manual — 8501-00-2400 Rev D

Publicly hosted copies of Candela-authored manuals. Reviewed November 6, 2026. VMS is an independent service provider, not affiliated with or endorsed by Candela. Manufacturer names identify equipment only.