Error Code	Symptom	Fault Type	Guide
Cup Size LEDs Flashing Alternately	Espresso and Lungo (or multiple cup size) LEDs flash alternately and machine will not brew	Programming / Calibration Mode or Fault	View Details
Descale Light On Solid	Descale indicator remains on; machine still brews but warns of scale	Scale Accumulation Detected by Usage Counter	View Details
Error 1	Machine does not heat; coffee button lights may blink rapidly and brewing will not start	Thermoblock Overheat or Open Circuit	View Details
Error 10	Machine overheats and shuts down; overheat icon or Error 10 displayed	Overtemperature Protection Triggered	View Details
Error 2	Machine powers on but pump does not run; no water flow when brewing is started	Pump Circuit Failure	View Details
Error 3	Machine stops mid-brew and lights flash; capsule area may be flooded with water	Brew Circuit Overpressure or Flow Obstruction	View Details
Error 4	Machine will not start; all LEDs blink rapidly or a general fault icon appears	Control Board General Fault / Self-Test Failure	View Details
Error 5	Machine detects water leak; some models show a leak icon or Error 5 and stop brewing	Internal Leak Detection / Drip Tray Overflow	View Details
Error 6	Capsule lever cannot lock or unlock; machine shows error and will not brew	Brew Head Lock Mechanism Fault	View Details
Error 7	Milk frother (integrated Aeroccino or milk carafe) does not operate; milk icon blinks or error displayed	Milk Frother Heater or Motor Fault	View Details
Error 8	Cup tray or drip tray sensor error; machine refuses to brew and indicates tray issue	Drip Tray / Container Presence Sensor Fault	View Details
Error 9	Descale light or message remains on after descaling; machine may refuse to brew and shows Error 9 or descale icon	Descale Mode Exit / Flow Meter Recognition Fault	View Details
Orange Light Blinking Fast	Fast blinking orange light; machine refuses to brew	Water System or Capsule System Error	View Details
Orange Light Pulsing	On some Nespresso models, a pulsing orange light indicates the machine is in special mode (descale, clean, or error)	Mode / Program State or Minor Fault	View Details
Red & Green Alternating	On some Vertuo models, red and green lights alternate and the machine will not brew	Capsule Recognition / Barcode Reading Fault	View Details
Red & Yellow Alternating	On some Vertuo models, red and yellow lights alternate and brewing is disabled	Descale Required / Severe Scale Detected	View Details
Red Light Blinking Fast	Fast blinking red light; machine will not start brewing	Pump or Flow Error	View Details
Red Light Steady	On many Nespresso OriginalLine models, a steady red light appears and the machine does not brew	General Heating or Electronics Fault	View Details
Used Capsule Container Icon Flashing	Used capsule container icon flashes; machine refuses to brew even when container is empty	Used Capsule Container Presence / Full Sensor Fault	View Details
Water Tank Icon Flashing	Water tank icon flashes even when tank is full; machine will not brew	Water Tank Presence / Level Detection Fault	View Details
–	Burning smell during operation, with or without visible smoke	Overheating Electrical Component	View Details
–	Buttons are unresponsive or only some buttons work intermittently	User Interface / Keypad Failure	View Details
–	Capsule is not pierced; water flows around capsule or into drip tray without brewing coffee	Capsule Piercing Mechanism Failure	View Details
–	Capsules are not ejected; used capsules remain stuck in the brew head	Capsule Ejection Mechanism Jam	View Details
–	Coffee dispenses only a few drops or is much less than the selected volume	Restricted Flow / Under-Dosing	View Details
–	Coffee is not hot enough even immediately after brewing	Low Brew Temperature	View Details
–	Coffee tastes weak or watery compared to usual	Low Extraction Pressure or Incorrect Flow	View Details
–	Coffee volume is too large; cup overflows compared to programmed size	Over-Dosing / Flow Meter Miscalibration	View Details
–	Lever is very hard to close or open; loud cracking noises when operating lever	Mechanical Binding in Brew Head	View Details
–	Machine makes loud buzzing but no water comes out	Pump Running with No Flow	View Details
–	Machine powers on but does not heat; water flows cold through the spout	No Heating / Open Heater Circuit	View Details
–	Machine shuts off unexpectedly during brewing and must be restarted	Intermittent Power Loss / Thermal Cutout	View Details
–	Machine stays in preheating mode indefinitely; ready lights never come on	Preheat Timeout / Temperature Feedback Fault	View Details
–	Machine vibrates excessively and moves on the counter during brewing	Excessive Vibration from Pump	View Details
–	Machine will not power on at all; no lights or response when buttons are pressed	No Power / Dead Appliance	View Details
–	Milk frother heats but does not froth (no foam)	Mechanical Frothing Failure	View Details
–	Milk frother spins but does not heat milk	Milk Frother Heater Failure	View Details
–	Musty or moldy smell from coffee or from inside the machine	Microbial Growth in Wet Areas	View Details
–	Unusual loud rattling or grinding noise during brewing	Mechanical Noise from Pump or Brew Mechanism	View Details
–	Water leaks from the back or bottom of the water tank area	Water Tank or Tank Valve Leak	View Details
–	Water leaks from under the machine during or after brewing	Internal Water Leak	View Details

Nespresso Coffee Makers Error Codes

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