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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

ER31

Hob / Cooktop

Heating Element, Thermostat & Safety Fuse

Zerowatt ZH Induction & Vitroceramic Cooktop: Power board configuration data corrupted ER31; generator module variant coding table does not match cooktop model setup.

On Zerowatt cooktops featuring ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Unprogrammed replacement power board installed, electrical line surge, or corrupted non-volatile memory block.

Enter service configuration mode via touch button sequence and re-program the exact model code from appliance rating plate. Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

Er36

Oven / Microwave

NTC Temperature Sensor & Thermistor

Zerowatt ZO / MasterCook Pyrolytic Oven: Display console temperature sensor fault Er36; on-board thermistor on user interface board reads out of range.

On Zerowatt ovens powered by MasterCook convection heating elements, mechanical capillary thermostat regulation, and tangential cooling fan: Damaged SMD thermistor near microcomputer, cracked solder joint from thermal cycling, or console overheating.

Inspect display board under magnification for cracked solder joints around temperature sensor SMD components. Replace display PCB if thermistor is damaged. Set knobs to zero, disconnect cooker switch at the wall for 45 seconds, reconnect power and set mechanical timer.

ER36

Hob / Cooktop

NTC Temperature Sensor & Thermistor

Zerowatt ZH Induction & Vitroceramic Cooktop: Touch board ambient NTC sensor shorted ER36; temperature sensor on user interface PCB reads short-circuit to ground.

On Zerowatt cooktops powered by ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Moisture or conductive grease droplet bridging SMD thermistor contacts, cracked component package, or solder bridge.

Clean touch board PCB around SMD thermistor using flux remover or alcohol. Measure resistance with multimeter (~10 kΩ at 25°C). Replace board if short persists. Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

Er47

Oven / Microwave

Heating Element, Thermostat & Safety Fuse

Zerowatt ZO / MasterCook Pyrolytic Oven: LIN-bus communication error Er47; internal local interconnect network link between touch interface and power module drops packets.

On Zerowatt ovens utilizing MasterCook convection heating elements, mechanical capillary thermostat regulation, and tangential cooling fan: Electromagnetic interference from spark ignition/heating relay arcing, pinched LIN data line, or defective transceiver IC.

Check LIN-bus wire routing away from 230V AC heating element conductors. Verify terminal pin tension on both ends. Test bus line voltage (~9V–12V DC). Set knobs to zero, disconnect cooker switch at the wall for 45 seconds, reconnect power and set mechanical timer.

ER47

Hob / Cooktop

Heating Element, Thermostat & Safety Fuse

Zerowatt ZH Induction & Vitroceramic Cooktop: LIN-Bus communication between touch controller and power inverter module missing ER47; transmission timeout error.

On Zerowatt cooktops utilizing ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Unseated communication connector, broken wire in wiring loom, or damaged LIN transceiver IC on either board.

Inspect wiring harness connecting touch interface to induction generator module. Verify pin continuity and terminal retention force. Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

Er56

Oven / Microwave

Heating Element, Thermostat & Safety Fuse

Zerowatt ZO / MasterCook Pyrolytic Oven: Analog-to-digital converter reference error Er56; microprocessor ADC reference voltage drifts outside ±2% precision limits.

On Zerowatt ovens powered by MasterCook convection heating elements, mechanical capillary thermostat regulation, and tangential cooling fan: Faulty precision Zener reference diode on PCB, corrupted ground reference plane, or failing microcontroller.

Measure 3.3V or 5.0V ADC reference voltage pad with digital voltmeter. If voltage is erratic or outside tolerance, replace main control board. Set knobs to zero, disconnect cooker switch at the wall for 45 seconds, reconnect power and set mechanical timer.

F

Hob / Cooktop

General System & Mechanical Integration

A flashing 'F' appears on a cooking zone and it won't heat

No pan, an incorrect type of pan (not magnetic), or a pan that is too small or not centered is on the induction zone.

Ensure you are using a flat-bottomed, magnetic (induction-compatible) pan that is correctly sized and centered on the cooking zone.

F0

Hob / Cooktop

NTC Temperature Sensor & Thermistor

Zerowatt ZH Induction & Vitroceramic Cooktop: Cooking coil temperature sensor disconnected F0; generator board detects open circuit on temperature feedback line.

On Zerowatt cooktops utilizing ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Disconnected 2-pin spade connector on coil center thermistor, wire severed by internal metal bracket, or failed NTC.

Disconnect mains. Open glass surface. Verify 2-pin sensor plug is seated firmly in power module socket. Measure resistance (~100 kΩ at 25°C). Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

F0

Oven / Microwave

Heating Element, Thermostat & Safety Fuse

Zerowatt ZO / MasterCook Pyrolytic Oven: User interface board communication failure F0; display module cannot communicate with main power relay board.

On Zerowatt ovens utilizing MasterCook convection heating elements, mechanical capillary thermostat regulation, and tangential cooling fan: Disconnected communication cable, corroded pin terminals, or loss of low-voltage DC operating power.

Inspect wiring harness connecting touch console to power relay board. Reseat all terminal plugs and test low-voltage supply lines. Set knobs to zero, disconnect cooker switch at the wall for 45 seconds, reconnect power and set mechanical timer.

F0

Refrigerator / Freezer

Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Variable frequency inverter compressor communication fault F0; main control PCB loses PWM / UART handshake with inverter driver board.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Broken PWM signal wire between boards, blown inverter control fuse, or failed optocoupler on inverter drive.

Check 230V AC mains input to inverter module. Measure PWM frequency signal (40-150 Hz square wave, 5V DC peak) on communication line. Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

F01

Oven / Microwave

NTC Temperature Sensor & Thermistor

Oven not heating correctly or overheating

The oven's temperature sensor (NTC probe) is faulty, either open circuit or short circuit.

Test the resistance of the temperature sensor. If the reading is infinite or zero, the sensor must be replaced.

F1

Tumble Dryer

NTC Temperature Sensor & Thermistor

Zerowatt ZTD Condenser & Heat-Pump Tumble Dryer: Air intake temperature sensor fault F1; front air temperature probe disconnected or reading outside allowable bounds.

On Zerowatt dryers utilizing ZTD condensation airflow duct system, bi-metal safety thermal cut-out, and electromechanical program timer: Defective front NTC thermistor, loose pin terminal on air duct harness, or internal short circuit.

Disconnect wire harness at front sensor. Measure resistance (~10 kΩ–20 kΩ at 25°C). Replace sensor assembly if open or short. Rotate dial to Off, press Start and Low Heat buttons for 5 seconds until the buzzer chirps twice, then release and turn to Off.

F1

Hob / Cooktop

NTC Temperature Sensor & Thermistor

Zerowatt ZH Induction & Vitroceramic Cooktop: Cooking coil temperature sensor short circuit F1; measured probe resistance drops to near zero ohms.

On Zerowatt cooktops utilizing ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Chafed sensor leads crushed under inductor mounting plate, internal bead breakdown, or solder bridge on PCB header.

Inspect wiring from sensor to generator PCB for pinched insulation. Disconnect and measure resistance (must not be zero; nominal ~100 kΩ at 25°C). Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

F1

Oven / Microwave

NTC Temperature Sensor & Thermistor

Zerowatt ZO / MasterCook Pyrolytic Oven: Temperature sensor disconnected F1; cavity sensor circuit is open, preventing oven heating operation.

On Zerowatt ovens utilizing MasterCook convection heating elements, mechanical capillary thermostat regulation, and tangential cooling fan: Defective oven temperature sensor probe, loose spade terminal at sensor connection, or broken sensor lead wire.

Disconnect sensor probe harness. Measure resistance with multimeter (~1080 Ω at 20°C for PT1000). Replace probe if open-circuit. Set knobs to zero, disconnect cooker switch at the wall for 45 seconds, reconnect power and set mechanical timer.

F1

Refrigerator / Freezer

Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Freezer evaporator fan motor malfunction F1; low-voltage brushless DC circulation fan stalled or tachometer feedback missing.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Ice buildup obstructing fan impeller, seized motor sleeve bearing, or failed Hall effect speed sensor.

Check evaporator fan for physical ice bind. Measure 12V DC power supply and pulse feedback (approx. 2-5V DC fluctuating during rotation). Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

F02

Oven / Microwave

Heating Element, Thermostat & Safety Fuse

Oven cuts out during use, especially at high temperatures

Overheating detected. The cooling fan is not working, air vents are blocked, or the safety thermostat has failed.

Check if the cooling fan runs when the oven is hot. Ensure there is adequate ventilation around the built-in appliance. Test the safety thermostat for continuity.

F2

Tumble Dryer

NTC Temperature Sensor & Thermistor

Zerowatt ZTD Condenser & Heat-Pump Tumble Dryer: Rear exhaust temperature sensor fault F2; exhaust air probe sends corrupted or out-of-range temperature signal.

On Zerowatt dryers utilizing ZTD condensation airflow duct system, bi-metal safety thermal cut-out, and electromechanical program timer: Defective rear duct NTC thermistor, damaged sensor wire harness near heater chamber, or connector corrosion.

Check rear duct probe resistance (~10 kΩ–20 kΩ at 25°C). Inspect sensor lead routing to ensure no heat damage from rear element. Rotate dial to Off, press Start and Low Heat buttons for 5 seconds until the buzzer chirps twice, then release and turn to Off.

F2

Hob / Cooktop

Heating Element, Thermostat & Safety Fuse

Zerowatt ZH Induction & Vitroceramic Cooktop: Communication loss to induction generator module F2; main controller loses sync with left or right power inverter board.

On Zerowatt cooktops utilizing ZH induction & vitroceramic heating elements, bi-metallic energy regulator controls, and residual heat indicators: Disconnected inter-module bus cable, blown power board fuse, or failed switch-mode auxiliary supply on generator PCB.

Check internal multi-wire cable linking display and power modules. Inspect PCB glass fuse with ohmmeter. Measure auxiliary DC voltages on generator board. Wipe glass dry, switch off the hob fuse breaker for 30 seconds, restore circuit and hold Key Symbol for 4 seconds.

F2

Oven / Microwave

Heating Element, Thermostat & Safety Fuse

Zerowatt ZO / MasterCook Pyrolytic Oven: Cavity overtemperature safety shutoff F2; oven temperature exceeds maximum safety limit during heating cycle.

On Zerowatt ovens utilizing MasterCook convection heating elements, mechanical capillary thermostat regulation, and tangential cooling fan: Stuck heating element relay contacts on control board, damaged sensor calibration, or restricted cooling airflow.

Power off at breaker immediately. Allow oven to cool completely. Verify heating relays de-energize properly when cycle is cancelled. Set knobs to zero, disconnect cooker switch at the wall for 45 seconds, reconnect power and set mechanical timer.

F2

Refrigerator / Freezer

Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Refrigerator compartment air circulation fan fault F2; fresh food multi-airflow fan fails rotation speed verification.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Foreign object jamming duct, broken fan wiring loom, or defective driver circuit on main PCB.

Inspect fresh food air tower duct. Check 12V DC across fan terminals during forced test mode; test winding resistance (typically 40-100 Ω). Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

F03

Oven / Microwave

Drive Motor, Inverter & Tachometer Sensor

Oven door is stuck locked after a pyrolytic cleaning cycle

The door lock motor or the microswitch that detects the lock position has failed.

Allow the oven to cool completely. Try running a short cooking cycle to see if it resets the lock. If not, the door lock assembly will likely need to be manually released and replaced.

F3

Tumble Dryer

NTC Temperature Sensor & Thermistor

Zerowatt ZTD Condenser & Heat-Pump Tumble Dryer: Compressor discharge pipe high-temperature limit exceeded F3; temperature on discharge line exceeds 115°C.

On Zerowatt dryers utilizing ZTD condensation airflow duct system, bi-metal safety thermal cut-out, and electromechanical program timer: Low refrigerant charge causing superheat, blocked heat exchanger coil, or defective discharge NTC sensor.

Allow system to cool. Thoroughly clean heat exchanger and filters. Measure discharge sensor (~10 kΩ at 25°C). Inspect sealed system for oil trace (leak). Rotate dial to Off, press Start and Low Heat buttons for 5 seconds until the buzzer chirps twice, then release and turn to Off.

F3

Oven / Microwave

NTC Temperature Sensor & Thermistor

Zerowatt ZO / MasterCook Pyrolytic Oven: Temperature sensor probe circuit open F3; sensor signal resistance is infinite, halting heating cycle.

On Zerowatt ovens utilizing MasterCook convection heating elements, mechanical capillary thermostat regulation, and tangential cooling fan: Severed probe wiring behind oven back wall, broken probe element, or open terminal plug on controller board.

Remove rear service panel. Measure probe resistance (~1080 Ω at 20°C for PT1000). Check wiring harness continuity to main board. Set knobs to zero, disconnect cooker switch at the wall for 45 seconds, reconnect power and set mechanical timer.

F3

Refrigerator / Freezer

Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Condenser cooling fan motor failure F3; rear machine compartment fan stalls or fails thermal heat extraction.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Heavy lint/dust accumulation on condenser coils, locked motor bearings, or open supply circuit.

Vacuum condenser fins thoroughly. Check 12V DC (or 230V AC on shaded pole models) at fan connector. Replace seized fan assembly. Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

F3

Washing Machine

NTC Temperature Sensor & Thermistor

Zerowatt SpazioTop / LadyPiù / Optima Washing Machine: Wash water temperature NTC sensor error F3; temperature readings open or short-circuited.

On Zerowatt washers utilizing integrated GIAS Invensys circuit architecture, electronic commutator drive motor, and mechanical pressure calibration: Defective NTC thermistor element, loose wire connector at heating element base, or water ingress in probe housing.

Unplug NTC connector. Measure sensor resistance with multimeter (nominal ~12.5 kΩ at 25°C, ~1.5 kΩ at 70°C). Replace if open or short. Turn dial to Off, hold Start/Pause and Spin speed buttons together for 5 seconds until the status lamps pulse, then power cycle.

F04

Oven / Microwave

Electronic Control Board (PCB) & Bus Communications

Oven is not working, display may show error or be erratic

EEPROM data corruption on the main control board. The oven's 'memory' is faulty.

Disconnect the oven from the power supply for at least 30 minutes to perform a hard reset. If the error persists upon reconnection, the main control board needs to be replaced.

F4

Tumble Dryer

Water Level Pressure Switch & Air Dome

Zerowatt ZTD Condenser & Heat-Pump Tumble Dryer: Condensate evacuation pump failure F4; water level switch in collection sump remains active after pump run cycle.

On Zerowatt dryers utilizing ZTD condensation airflow duct system, bi-metal safety thermal cut-out, and electromechanical program timer: Lint sludge blocking pump intake, kinked condensate drain tube, or open pump motor coil (~120–280 Ω).

Clean lower sump chamber and float switch. Inspect small drain tube to upper tank for clogs. Measure pump resistance (~120–280 Ω). Rotate dial to Off, press Start and Low Heat buttons for 5 seconds until the buzzer chirps twice, then release and turn to Off.

F4

Oven / Microwave

NTC Temperature Sensor & Thermistor

Zerowatt ZO / MasterCook Pyrolytic Oven: Temperature sensor probe short circuit F4; sensor signal resistance is near zero ohms, preventing temperature control.

On Zerowatt ovens utilizing MasterCook convection heating elements, mechanical capillary thermostat regulation, and tangential cooling fan: Chafed sensor wiring touching metal chassis, internal short inside probe bulb, or solder bridge on board connector.

Disconnect sensor at main board and measure resistance. If <100 Ω, inspect wiring for pinches or replace damaged probe assembly. Set knobs to zero, disconnect cooker switch at the wall for 45 seconds, reconnect power and set mechanical timer.

F4

Refrigerator / Freezer

Refrigeration Compressor, Defrost Heater & PTC Relay

Zerowatt ZR / FrostFree Combi Refrigerator: Inverter module IPM overcurrent / compressor lockout F4; compressor driver detects abnormal rotor stall or power transistor overload.

On Zerowatt refrigeration units featuring ZR FrostFree cooling circuit, mechanical thermostat / NTC temperature regulation, and hermetic compressor: Mechanically seized compressor piston, shorted 3-phase UVW windings, or shorted IGBT power bridge on inverter board.

Disconnect compressor plug. Measure resistance between U-V, V-W, and U-W pins (must be equal, approx. 8-15 Ω balanced). Check each pin to ground (>10 MΩ). Reset: Hold Temperature button for 10 seconds until the interior cabinet light blinks three times signaling microprocessor reset.

F4

Washing Machine

Heating Element, Thermostat & Safety Fuse

Zerowatt SpazioTop / LadyPiù / Optima Washing Machine: Heating circuit failure F4; water does not heat up during wash phase within allotted cycle time.

On Zerowatt washers utilizing integrated GIAS Invensys circuit architecture, electronic commutator drive motor, and mechanical pressure calibration: Open wash heating element (~25–30 Ω), burned heater relay contacts on control board, or tripped high-limit thermostat.

Measure heating element resistance across its terminals (nominal ~25–30 Ω). Check element insulation to ground (>10 MΩ). Inspect board relay. Turn dial to Off, hold Start/Pause and Spin speed buttons together for 5 seconds until the status lamps pulse, then power cycle.

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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

AL03 AL05 E01 E1 E02 E2 E03 E3 E04 E4 E05 E5 E06 E6 E07 E7 E08 E8 E9 E10 E12 E14 E15 E16 E17 E18 Ed EF Eh EL i20 i30

Washing Machine8

CLr E20 E22 FA FC0 FC1 FC2 Unb

Tumble Dryer10

E09 E11 E13 E21 F1 F2 F3 F4 F5 F6

Oven / Microwave25

Er01 Er02 Er03 Er04 Er05 Er06 Er07 Er08 Er09 Er15 Er20 Er21 Er22 Er31 Er36 Er47 Er56 F01 F02 F03 F04 F08 Loc Sabb STOP

Hob / Cooktop9

E0 F F0 F7 F8 F9 H L U

Refrigerator / Freezer4

AL01 AL02 EA Er

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