Quick answer: Cynosure Cynergy fault codes use an "E" prefix and cover water flow (E01), shutter faults (E02, E03), electrical and memory faults (E04, E05), YAG IGBT overload (E07), heater and coolant faults (E08, E09), HVPS faults (E10, E14, E19), lamp and simmer faults (E13), dump circuit faults (E15, E16, E17), water flowmeter faults (E18), and fiber, handpiece, or calibration faults (E23, E24, E25). Power and HVPS related codes generally need technician servicing, while water flow and coolant faults can often be checked by the operator first.
If your Cynosure Cynergy is displaying a fault code, the code on screen is the fastest path to diagnosing the problem. This guide covers the documented fault codes for the Cynergy platform, what each one means, what is likely causing it, and what to do next.
Fault codes below are drawn from the official Cynosure Cynergy operator's manual (doc. 850-1065-000, Rev. 6). Always confirm with a qualified technician before replacing parts.
Water and Cooling Faults
E01, Water Flow Fault
What it is: The system has detected a loss of water flow.
Likely causes:
- Broken water pump
- Blown fuse on the water pump circuit
What to do:
- Cycle power to the system.
- If the fault clears and does not return, continue normal use.
- If the fault returns, the system needs servicing. Do not continue operating.
E08, Heater Fault
What it is: An open thermostat or heater circuit fault.
Likely causes:
- Open thermostat
- Blown heater fuse
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
E09, Coolant Sensor Fault
What it is: An open or unplugged thermistor sensor in the cooling system.
Likely causes:
- Disconnected thermistor sensor
- Failed thermistor sensor
What to do:
- Check that the thermistor sensor connection is fully seated.
- If the fault persists, the sensor needs replacement by a technician.
E18, H2O Flowmeter
What it is: A defective water flow sensor.
Likely causes:
- Failed flowmeter sensor
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
Shutter Faults
E02, Open Shutter Fault
What it is: The safety shutter is stuck closed.
Likely causes:
- Mechanical jam in the shutter assembly
- Failing shutter actuator
What to do:
- Do not use the laser until serviced.
- Contact PhotonX for diagnosis and parts.
E03, Close Shutter Fault
What it is: The safety shutter is stuck open.
Likely causes:
- Mechanical jam in the shutter assembly
- Failing shutter actuator
What to do:
- Do not use the laser until serviced.
- Contact PhotonX for diagnosis and parts.
Electrical and Memory Faults
E04, Fuse Open
What it is: A blown capacitor bank fuse or a shorted dump circuit.
Likely causes:
- Blown capacitor bank fuse
- Shorted dump circuit
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
E05, Checksum Error
What it is: A computer program memory error.
Likely causes:
- Memory fault on the control board
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
E07, IGBT Fault, YAG
What it is: A YAG IGBT overload has been sensed.
Likely causes:
- Transient overload condition
- Failing IGBT component
What to do:
- Cycle power to continue.
- If the fault recurs frequently, the IGBT needs technician inspection.
Power Supply Faults
E10, No High Voltage
What it is: The capacitor bank or HVPS wiring is shorted, with no readback voltage detected.
Likely causes:
- Shorted capacitor bank wire
- Shorted HVPS wire
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
E13, No Simmer YAG
What it is: The YAG lamp is not simmering correctly.
Likely causes:
- Broken lamp
- Blown fuse
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
E14, HVPS Fault
What it is: An HVPS over-temperature condition.
Likely causes:
- Cooling system issue affecting the HVPS
- HVPS component degradation
What to do:
- Allow the system to cool and check ventilation around the HVPS.
- If the fault persists, the HVPS needs technician servicing.
E19, HVPS Fault
What it is: An HVPS over-voltage or open-circuit condition.
Likely causes:
- HVPS component failure
- Open circuit in the HVPS wiring
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
E15, E16, E17, Dump Fault
What it is: A range of dump circuit faults. E15 indicates the dump is always on or shorted, with a possible failed dump transistor or HVPS failure. E16 and E17 indicate the dump is not working, with possible broken fiber connections to the capacitor bank or a disconnected or failed HVPS.
Likely causes:
- Shorted dump circuit
- Failed dump transistor
- Broken fiber connection to the capacitor bank
- Disconnected or failed HVPS
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
Fiber, Handpiece, and Calibration Faults
E23, Low Trans, Fiber or Handpiece
What it is: Damage detected in the fiber, handpiece, or focus lens.
Likely causes:
- Damaged fiber
- Damaged handpiece
- Damaged focus lens
What to do:
- Inspect the fiber, handpiece, and focus lens for visible damage.
- Replace the damaged component.
Shop handpiece and lens parts →
E24, YAG Calibration Error
What it is: Incorrect resonator port or cal port sensor calibration.
Likely causes:
- Sensor calibration drift
- Dirty or damaged cal port window
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
E25, YAG Cal Failed, Energy Low
What it is: The cal port energy reading is too low to use for calibration.
Likely causes:
- Lamp degradation
- Optical path obstruction or dirty optics
What to do:
- This fault needs service. Contact PhotonX for diagnosis and parts.
When to Call a Technician
Faults starting with "E" are critical and will stop the laser from operating. Some, like E01 and E07, can be cleared with a power cycle on first occurrence. Most others, including every power supply, dump circuit, and calibration fault, require a qualified laser technician. Continuing to operate the system through a persistent fault risks further damage to the power supply or optical components.
PhotonX manufactures replacement parts for Cynosure Cynergy systems. Get in touch with our team for help sourcing the right part for your fault code.