here are what the numbers mean. 5 is probably throwing the others but you'll need a service tech to know for sure.
have you unplugged/cut off power to it for 10 min to see if it may possibly reset? Worth a try anyway.
Error 1
Door safety lock error
- Check door is closed and latched correctly
- Check wiring
- Check door lock
- Check drum braking device if fitted
Error 2
Not filled in preset time allowed - washing machine does not fill
- Check mains water pressure
- Check inlet hoses for kinks
- Check inlet filter
- Check water inlet valve
- Pressure switch fault
- Wiring fault
Error 3
Not drained in time allowed - washing machine fails to drain water
- Check that filter is not blocked or obstructed
- Check drain hose is clear of any blockage or obstruction
- Check wiring to drain pump
- Check drain pump is not defective
- Check level sensor or switch
- Check wiring to level sensor
Error 4
Multiple instances of anti-flood contacts in pressure switch being made
- Check for overfoaming evidence - can trip pressure switch
- Check wiring to level sensor
- Check pressure switch is not defective
- Water inlet valve locked open
Error 5
NTC fault - temperature sensor detected as either open circuit or shorted
- Check wiring to temperature sensor
- Check thermistor
Error 6
EEPROM failure - defective electronic controller
- Check wiring
- Check electronic control PCB
Error 7
Motor fault detected
- Check motor connector block
- Check wiring
- Check motor carbon brushes
- Check tacho connections
- Check motor
Error 8
Motor tacho fault - washing machine motor tacho detected as open circuit or shorted
- Check motor connector block
- Check wiring
- Check tacho connections
- Check motor
Error 9
Short circuit motor triac on electronic module
- Check wiring
- Check electronic controller
Error 12
Communication error between electronic control boards and wiring
- Check wiring and harness between control boards
- Check electronic control modules
Error 13
Communication error between boards and wiring
- Check wiring and harness between control boards
- Check electronic control modules
Error 14
Water heating error detected
- Check wiring to wash heater and thermostats
- Check wash heater for continuity
- Check NTC (temperature sensor) probe
Error 15
Defective control module - Not programmed Cuore control
- Reprogram electronic controller
- Replace electronic controller
Error 16
Water heating element detected as short circuit
- Check for defective electrical insulation
- Check water heating element
- Check water heater wiring
Error 17
Wrong signal from motor tachometric generator
- Check motor connector block
- Check wiring
- Check tacho connections
- Check motor
Error 18
Defective control module - also can be wrong electrical input frequency
- Check wiring to electronic controller or both if two used
- Check electrical input frequency
- Check mains electrical supply