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Zerowatt • Central Diagnostic Dictionary
176 Verified Codes in Database

Zerowatt Error Codes & Diagnostics

Access our premium database of error codes, common faults, and professional repair solutions for Zerowatt appliances.

Luxury front-loading washing machine in brushed titanium with illuminated dark glass drum
CodeAppliancesFault / DiagnosticsRepair InstructionsAction
AL01
Refrigerator / Freezer
Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Critical freezer high temperature alarm AL01; freezer compartment temperature has risen above safe threshold of -9°C.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Prolonged domestic power outage, freezer door left open, heavy loading of unfrozen food, or refrigerant leak.

Mute acoustic alarm with Alarm Reset button. Activate Super Freeze mode for 12 hours. Verify compressor runs and evaporator chills down to -18°C. Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

Diagnose
AL02
Refrigerator / Freezer
Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Water dispenser filter expiration / flow timeout alarm AL02; water purification filter cartridge life limit or fill slow rate detected.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: 6-month cartridge timer elapsed, clogged carbon block filter, or low household water line pressure (<1.5 bar).

Replace internal water filter cartridge. Flush 5 liters through dispenser to purge air. Press and hold Water Filter Reset button for 3 seconds. Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

Diagnose
AL03
Dishwasher
Drainage System & Drain Pump

Zerowatt ZD / Space / CompactLine Dishwasher: Drain evacuation alarm AL03; sump fails to empty completely during intermediate rinse drain phase.

On Zerowatt dishwashers powered by CompactLine hydraulic wash circuit, mechanical water pressure regulation, and micro-switch anti-flood float protection: Heavy grease clogs in drain hose, sink siphon nipple blocked, or drain pump motor winding weakened (~160–220 Ω).

Disconnect drain hose from under-sink siphon and verify clear bore. Flush drain hose with warm water. Measure pump motor resistance (~160–220 Ω). Hold Start button for 5 seconds until the program run LED stops blinking, close the door to complete drain, then power off.

Diagnose
AL05
Dishwasher
Drainage System & Drain Pump

Zerowatt ZD / Space / CompactLine Dishwasher: Water filling timeout alarm AL05; wash tank does not fill to operating level within program timeout limit.

On Zerowatt dishwashers utilizing CompactLine hydraulic wash circuit, mechanical water pressure regulation, and micro-switch anti-flood float protection: Scaled water supply tap, blocked metal strainer mesh in inlet hose connector, or defective inlet valve (~3.5–4.5 kΩ).

Check faucet flow rate with bucket test. Remove supply hose and rinse out particulate debris from inlet filter. Measure valve solenoid (~3.5–4.5 kΩ). Hold Start button for 5 seconds until the program run LED stops blinking, close the door to complete drain, then power off.

Diagnose
CLr
Washing Machine
Drainage System & Drain Pump

Zerowatt SpazioTop / LadyPiù / Optima Washing Machine: Tub clean safety drain prompt CLr; automated maintenance rinse cycle or reminder to clean drum interior.

On Zerowatt washers utilizing integrated GIAS Invensys circuit architecture, electronic commutator drive motor, and mechanical pressure calibration: Machine cycle counter has reached threshold (typically 50 wash cycles) without a high-temperature Tub Clean cycle.

Empty the drum completely, add machine descaler or oxygen bleach directly into drum, select Tub Clean program, and allow complete 90°C cycle to finish. Turn dial to Off, hold Start/Pause and Spin speed buttons together for 5 seconds until the status lamps pulse, then power cycle.

Diagnose
E0
Hob / Cooktop
Heating Element, Thermostat & Safety Fuse

Zerowatt ZH Induction & Vitroceramic Cooktop: Touch control module initialization error E0; touch interface microcontroller fails internal RAM diagnostic self-test.

On Zerowatt cooktops utilizing ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Mains supply transient voltage fluctuation during power-up, corrupted microprocessor registers, or dry electrolytic filter cap.

Power off at mains consumer unit for 60 seconds. Restore power and observe initialization. If code reoccurs instantly, replace touch control PCB. Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

Diagnose
E0
Refrigerator / Freezer
Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Interface display communication error E0; temperature control panel loses serial link with master power PCB.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Damaged door hinge wire harness, oxidized ribbon connector, or missing 5V DC low-voltage rail.

Inspect top door hinge wiring harness for fatigue breaks. Check 5V DC and 12V DC power pins at display connector CN1. Reset procedure: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

Diagnose
E01
Dishwasher
Drainage System & Drain Pump

Zerowatt ZD / Space / CompactLine Dishwasher: Water fill solenoid valve circuit fault E01; power board detects open circuit across inlet solenoid coil.

On Zerowatt dishwashers powered by CompactLine hydraulic wash circuit, mechanical water pressure regulation, and micro-switch anti-flood float protection: Burned inlet valve coil (~3.8 kΩ nominal), corroded connector spade terminals, or broken wire in door hinge harness.

Measure inlet valve coil resistance (~3.5–4.5 kΩ). Inspect wiring harness continuity from control board. Replace valve assembly if coil is infinite ohms. Hold Start button for 5 seconds until the program run LED stops blinking, close the door to complete drain, then power off.

Diagnose
E01
Tumble Dryer
General System & Mechanical Integration

Zerowatt ZTD Condenser & Heat-Pump Tumble Dryer: Airflow restriction warning E01; door lint filter clogged or lower heat exchanger condenser obstructed with lint.

On Zerowatt tumble dryers utilizing ZTD condensation airflow duct system, bi-metal safety thermal cut-out, and electromechanical program timer: Dense lint coating on fine mesh screen, blocked air passage in lower plinth, or high differential temperature across air duct.

Remove door lint filter and wash under warm tap water; dry before refitting. Open bottom plinth and vacuum condenser aluminum fins. Rotate dial to Off, press Start and Low Heat buttons for 5 seconds until the buzzer chirps twice, then release and turn to Off.

Diagnose
E01
Washing Machine
Drive Motor, Inverter & Tachometer Sensor

Zerowatt SpazioTop / LadyPiù / Optima Washing Machine: Door interlock error E01; appliance refuses to commence wash cycle because the door latch contact is not verified.

On Zerowatt washing machines utilizing integrated GIAS Invensys circuit architecture, electronic commutator drive motor, and mechanical pressure calibration: Defective door latch microswitch, laundry pinched in the rubber bellow, or open PTC solenoid coil (~900–1200 Ω).

Verify door latch alignment. Inspect wiring harness between lock and main module. Measure lock coil resistance (~900–1200 Ω across terminals 1-3). Turn dial to Off, hold Start/Pause and Spin speed buttons together for 5 seconds until the status lamps pulse, then power cycle.

Diagnose
E1
Dishwasher
Drainage System & Drain Pump

Zerowatt ZD / Space / CompactLine Dishwasher: Water inlet fill failure E1; appliance detects no incoming water flow into sump after opening fill valve.

On Zerowatt dishwashers utilizing CompactLine hydraulic wash circuit, mechanical water pressure regulation, and micro-switch anti-flood float protection: Closed water supply valve, kinked inlet hose, blocked AquaStop mesh filter, or open valve coil (~3.5–4.5 kΩ).

Check water supply tap pressure. Unscrew supply hose and clean AquaStop inlet filter screen. Measure solenoid valve coil (~3.5–4.5 kΩ). Hold Start button for 5 seconds until the program run LED stops blinking, close the door to complete drain, then power off.

Diagnose
E1
Hob / Cooktop
Heating Element, Thermostat & Safety Fuse

Zerowatt ZH Induction & Vitroceramic Cooktop: Touch sensor zone covered by object or liquid E1; continuous conductive activation detected on control glass for >10 seconds.

On Zerowatt cooktops featuring ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Boiled-over cooking liquid, conductive grease, wet cleaning rag, or metal pot lid resting directly over touch sensors.

Remove all cookware from control area. Wipe glass dry using a dry cotton towel. Clean any dried salt or starch residue. Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

Diagnose
E1
Refrigerator / Freezer
Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Refrigerator compartment temperature sensor fault E1; fresh food section thermistor circuit open or shorted.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Drifted NTC sensing bead, moisture ingress behind cabinet liner, or degraded wiring connector.

Measure NTC resistance at main PCB connector: standard value is ~5 kΩ at 25°C, rising to ~16.3 kΩ at 0°C. Replace sensor if out of tolerance. Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

Diagnose
E1
Washing Machine
Drainage System & Drain Pump

Zerowatt SpazioTop / LadyPiù / Optima Washing Machine: Water drainage failure E1; machine unable to drain water from wash tub within 4 minutes.

On Zerowatt washers utilizing integrated GIAS Invensys circuit architecture, electronic commutator drive motor, and mechanical pressure calibration: Blocked coin trap filter, kinked drain hose, pump impeller jammed by foreign object, or pump motor coil open (~160–220 Ω).

Clean drain pump filter at lower front. Verify free impeller rotation. Check pump resistance (~160–220 Ω across terminals). Turn dial to Off, hold Start/Pause and Spin speed buttons together for 5 seconds until the status lamps pulse, then power cycle.

Diagnose
E02
Dishwasher
Drainage System & Drain Pump

Zerowatt ZD / Space / CompactLine Dishwasher: Fill meter pulse count error E02; turbine sensor signals water fill but pulse frequency is erratic or dropping out.

On Zerowatt dishwashers featuring CompactLine hydraulic wash circuit, mechanical water pressure regulation, and micro-switch anti-flood float protection: Magnet pin loose in flowmeter impeller, limescale accumulation inside water jacket labyrinth, or oxidized plug contacts.

Inspect left-side plastic air break for scale deposits. Clean electrical contacts on reed switch PCB with contact spray. Replace air break if impeller sticks. Hold Start button for 5 seconds until the program run LED stops blinking, close the door to complete drain, then power off.

Diagnose
E02
Tumble Dryer
NTC Temperature Sensor & Thermistor

Zerowatt ZTD Condenser & Heat-Pump Tumble Dryer: Process air duct NTC sensor error E02; thermistor signal indicates circuit open, short, or temperature out of operating range.

On Zerowatt tumble dryers powered by ZTD condensation airflow duct system, bi-metal safety thermal cut-out, and electromechanical program timer: Defective front airflow NTC thermistor bead (~20.0 kΩ at 25°C), disconnected spade terminals, or wire chafing.

Locate NTC probe at front blower duct. Disconnect wire terminals and measure resistance (~20.0 kΩ at 25°C, ~4.5 kΩ at 60°C). Replace if open. Rotate dial to Off, press Start and Low Heat buttons for 5 seconds until the buzzer chirps twice, then release and turn to Off.

Diagnose
E02
Washing Machine
Water Level Pressure Switch & Air Dome

Zerowatt SpazioTop / LadyPiù / Optima Washing Machine: Water inlet fill timeout E02; tub does not reach the minimum operating water level within 210 seconds of valve energization.

On Zerowatt washing machines with integrated GIAS Invensys circuit architecture, electronic commutator drive motor, and mechanical pressure calibration: Closed tap, kinked fill hose, clogged inlet valve mesh filter, or open solenoid coil (~3.5–4.5 kΩ).

Confirm mains water flow rate (>10 L/min). Clean the inlet filter screen. Check dual solenoid valve coil resistances (~3.5–4.5 kΩ). Turn dial to Off, hold Start/Pause and Spin speed buttons together for 5 seconds until the status lamps pulse, then power cycle.

Diagnose
E2
Dishwasher
Drainage System & Drain Pump

Zerowatt ZD / Space / CompactLine Dishwasher: Water fill timeout E2; flowmeter turbine pulse rate below threshold (<10 impulses per 100ml) during wash chamber filling.

On Zerowatt dishwashers featuring CompactLine hydraulic wash circuit, mechanical water pressure regulation, and micro-switch anti-flood float protection: Low line water pressure, scaled impeller in water jacket flowmeter, or defective reed switch sensor board.

Verify household water pressure (>1.5 bar). Inspect side air-break matrix for scale build-up. Test flowmeter reed switch continuity during active fill. Hold Start button for 5 seconds until the program run LED stops blinking, close the door to complete drain, then power off.

Diagnose
E2
Hob / Cooktop
NTC Temperature Sensor & Thermistor

Zerowatt ZH Induction & Vitroceramic Cooktop: Induction cooking zone coil overheat E2; NTC temperature sensor beneath ceramic glass detects temperature exceeding 240°C.

On Zerowatt cooktops utilizing ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Empty pot heated at booster setting (dry boil), thin warped pan base creating localized hot spot, or fan airflow blocked.

Switch off the cooking zone and remove cookware. Allow zone to cool down for 15 minutes. Check coil NTC thermistor resistance with a multimeter (~100 kΩ at 25°C). Verify bottom cabinetry intake air slots are not obstructed. Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

Diagnose
E2
Refrigerator / Freezer
Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Freezer compartment temperature sensor malfunction E2; low-temperature NTC thermistor circuit open or short-circuited.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Thermal fatigue under freezing cycles, moisture degradation in sensing tip, or severed freezer wire line.

Test freezer NTC resistance: nominal is ~5 kΩ at 25°C and ~32.5 kΩ at -18°C. Replace sensor assembly if open (>100 kΩ) or shorted (<500 Ω). Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

Diagnose
E2
Washing Machine
Drive Motor, Inverter & Tachometer Sensor

Zerowatt SpazioTop / LadyPiù / Optima Washing Machine: Door / lid lock failure E2; machine does not engage lock solenoid or detects door open during cycle start.

On Zerowatt washers featuring integrated GIAS Invensys circuit architecture, electronic commutator drive motor, and mechanical pressure calibration: Door catch out of alignment, defective door lock switch mechanism, or damaged wiring harness to main controller.

Inspect door strike hook. Verify door switch continuity with door closed. Replace door lock assembly if solenoid fails to latch. Turn dial to Off, hold Start/Pause and Spin speed buttons together for 5 seconds until the status lamps pulse, then power cycle.

Diagnose
E03
Dishwasher
Drainage System & Drain Pump

Zerowatt ZD / Space / CompactLine Dishwasher: Drain pump evacuation timeout E03; water remains detected in sump chamber after drain cycle timer elapses.

On Zerowatt dishwashers powered by CompactLine hydraulic wash circuit, mechanical water pressure regulation, and micro-switch anti-flood float protection: Toothpick or small bone jammed in pump impeller chamber, clogged corrugated drain hose, or worn pump motor (~160–220 Ω).

Remove sump filter cover and clear debris around drain impeller. Ensure hose is unobstructed to drain standpipe. Measure pump coil resistance (~160–220 Ω). Hold Start button for 5 seconds until the program run LED stops blinking, close the door to complete drain, then power off.

Diagnose
E03
Tumble Dryer
General System & Mechanical Integration

Zerowatt ZTD Condenser & Heat-Pump Tumble Dryer: Maximum drying cycle time exceeded E03; machine aborts cycle after running for 210 minutes without laundry reaching target dryness.

On Zerowatt tumble dryers utilizing ZTD condensation airflow duct system, bi-metal safety thermal cut-out, and electromechanical program timer: Severely fouled condenser unit, weak heat-pump refrigerant pressure, or wet clothes spun at too low wash RPM (<800 RPM).

Always spin clothes at minimum 1000 RPM in washing machine. Thoroughly clean heat exchanger fins with soft brush. Verify compressor operating heat. Rotate dial to Off, press Start and Low Heat buttons for 5 seconds until the buzzer chirps twice, then release and turn to Off.

Diagnose
E03
Washing Machine
Drainage System & Drain Pump

Zerowatt SpazioTop / LadyPiù / Optima Washing Machine: Water evacuation fault E03; machine aborts cycle with water remaining in drum after 180 seconds of drain pump operation.

On Zerowatt washing machines featuring integrated GIAS Invensys circuit architecture, electronic commutator drive motor, and mechanical pressure calibration: Blocked coin trap filter, foreign object jamming synchronous impeller, kinked drain hose, or open pump motor (~160–220 Ω).

Unscrew front coin filter and remove obstructions. Inspect impeller rotation. Measure drain pump winding resistance (~160–220 Ω). Turn dial to Off, hold Start/Pause and Spin speed buttons together for 5 seconds until the status lamps pulse, then power cycle.

Diagnose
E3
Dishwasher
Drainage System & Drain Pump

Zerowatt ZD / Space / CompactLine Dishwasher: Drain evacuation timeout E3; water remains in sump after 240 seconds of drain pump operation.

On Zerowatt dishwashers powered by CompactLine hydraulic wash circuit, mechanical water pressure regulation, and micro-switch anti-flood float protection: Blocked microfilter, foreign body (glass shard, olive pit) jamming drain impeller, kinked hose, or open pump motor (~160–220 Ω).

Remove sump filters and clean thoroughly. Check drain pump impeller for free rotation. Measure drain pump winding resistance (~160–220 Ω). Hold Start button for 5 seconds until the program run LED stops blinking, close the door to complete drain, then power off.

Diagnose
E3
Hob / Cooktop
Heating Element, Thermostat & Safety Fuse

Zerowatt ZH Induction & Vitroceramic Cooktop: Induction power board IGBT heatsink overtemperature E3; power transistor heatsink temperature exceeds 95°C safety shutoff.

On Zerowatt cooktops featuring ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Inoperative cooling fan, cutlery drawer or oven installed below hob blocking intake air, or dried thermal paste on heatsink.

Ensure minimum 20 mm air intake gap below hob and 5 mm frontal air exhaust gap. Test cooling fan spins freely and fan motor connector is plugged tight. Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

Diagnose
E3
Refrigerator / Freezer
Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Evaporator defrost temperature sensor fault E3; defrost termination NTC thermistor out of calibrated ohmic range.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Corrosion from defrost meltwater, loose mounting clip on accumulator tube, or internal resistor rupture.

Unclip defrost sensor from evaporator tubing. Check resistance (~5 kΩ at 25°C, ~16.3 kΩ at 0°C). Re-clip securely with thermal compound. Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

Diagnose
E3
Washing Machine
Drive Motor, Inverter & Tachometer Sensor

Zerowatt SpazioTop / LadyPiù / Optima Washing Machine: Spin cycle unbalance alert E3; drum cannot distribute wet laundry load evenly to reach high spin speeds safely.

On Zerowatt washers utilizing integrated GIAS Invensys circuit architecture, electronic commutator drive motor, and mechanical pressure calibration: Single heavy towel or bath rug, unevenly distributed bedding, or appliance chassis unlevel on floor.

Pause cycle, open door and manually untangle and redistribute garments. Check spirit level on top cover and adjust leveling feet. Turn dial to Off, hold Start/Pause and Spin speed buttons together for 5 seconds until the status lamps pulse, then power cycle.

Diagnose
E04
Dishwasher
Drainage System & Drain Pump

Zerowatt ZD / Space / CompactLine Dishwasher: Bottom tray anti-flood switch activated E04; water detected in base pan, triggering continuous drain and lock-out.

On Zerowatt dishwashers utilizing CompactLine hydraulic wash circuit, mechanical water pressure regulation, and micro-switch anti-flood float protection: Sump O-ring seal leak, perforated tub stainless steel seam, dripping wash pump shaft seal, or leaking water jacket hose.

Isolate electrical supply. Remove side panels and dry bottom pan. Run test cycle while inspecting sump joint, pump mechanical seal, and hose clamps with a torch. Hold Start button for 5 seconds until the program run LED stops blinking, close the door to complete drain, then power off.

Diagnose
E04
Tumble Dryer
Heating Element, Thermostat & Safety Fuse

Zerowatt ZTD Condenser & Heat-Pump Tumble Dryer: Heating circuit safety lockout E04; heater relay contacts stuck closed, or high-limit safety thermostat tripped.

On Zerowatt tumble dryers powered by ZTD condensation airflow duct system, bi-metal safety thermal cut-out, and electromechanical program timer: Welded relay contacts on control board, open safety thermal cutout fuse, or burned heating coil (~20–40 Ω).

Disconnect heater leads and measure element resistance (~20–40 Ω). Test safety thermostat continuity. Inspect board relay for welded contacts. Rotate dial to Off, press Start and Low Heat buttons for 5 seconds until the buzzer chirps twice, then release and turn to Off.

Diagnose
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Zerowatt — Complete Error Code Catalog

88 Verified Error Codes

Server-side index of all verified manufacturer error codes for technicians and automated crawlers.

Dishwasher32

AL03AL05E01E1E02E2E03E3E04E4E05E5E06E6E07E7E08E8E9E10E12E14E15E16E17E18EdEFEhELi20i30

Washing Machine8

CLrE20E22FAFC0FC1FC2Unb

Tumble Dryer10

E09E11E13E21F1F2F3F4F5F6

Oven / Microwave25

Er01Er02Er03Er04Er05Er06Er07Er08Er09Er15Er20Er21Er22Er31Er36Er47Er56F01F02F03F04F08LocSabbSTOP

Hob / Cooktop9

E0FF0F7F8F9HLU

Refrigerator / Freezer4

AL01AL02EAEr

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