Merloni error codes

[andy2]

ARISTON / INDESIT Evolution Range Error Codes also refers to the number of flashes on the non-lcd type

I have been having a look at the fault codes for these machines. By examining the code it is possible to deduce in most cases what the test actually involves and its anticipated result. Some tests are dependant upon active feedback from the componant (tacho gen, wash & dryer thermistors, pressure s/w, slave timer). Others are timeout faults where the operation is allowed a certain period to complete before entering error mode. Because some componants do not present any active feedback eg. Pump, fault detection is by the timout method apart from faults F01, F02 & F11 which probably monitor the output from the heater relay and the pump triac. Some tests are done before the cycle commences (thermistor ) whilst other faults become apparent during the course of the wash progarm.

Here are my suggestions for the componants tested with their relative error code and possible fault conditions.

Motor, motor triac & Tacho gen

Test – Apply current to motor & check tacho output relative to a fixed reference eg. wash speed.

F01 – Digital signal above high threshold – s/c triac, defective triac control circuitry, motor or wiring to earth fault.
F02 – (a) Digital tacho signal below low threshold – tacho magnet/coil loose, faulty detection circuitry on module. (b) No tacho signal – Open circuit coil, magnet or coil detached, open circuit motor, motor/drum jammed.

Note:- Regarding F02 – (Motor jammed or tachogenerator detached). I know some posts have said that there is no fault code for the motor specifically, but for example worn carbon brushes, leading to no rotation should give the same symptoms as this fault ie. no tacho output when current is applied to the motor. The only other means of detecting otherwise would be by ‘sensing’ the amount of current that is drawn by the motor.

N.T.C Thermistor

Test – Check resistance of thermistor against high and low reference values at ambient temperature.

F03 – Out of range – Faulty or o/c thermistor, IDC plug contacts/wiring, wiring, module plug, faulty circuitry on module.

Pressure switch

Test (1) Monitor high level of p.s/w until timeout or flood level reached (active during fill)

F04 – (a) No water inlet – water unavailable at valve, defective valve/coil, defective triac/module plug/wiring to valve. (b) Machine fills undetected – pressure s/w stuck on low level, blockage in pressure system, leaking pressure hose.

Test (2) Monitor low level of p.s/w until timeout (active during drain)

F05 – (a) Water remains in machine – Pump jammed/open circuit, pump wiring / IDC plug, module plug, triac, blockage in filter / sump or drain hose. (b) Water leaves machine undetected – Pressure s/w stuck on high level, blockage in pressure system,

Test (3) Monitor……???

F10 – Possible defective module (I have had this fault – burned out track caused by water)

Pump triac

Test – Checks for feedback from pump triac output when activated.

F11 – No output – Defective triac or drive circuitry on module.

Slave timer

Test – Feedback from slave timer

F06 – Defective timer or interconnect wiring.

Heater relay output

Test (1) – Check output from relay with no drive signal applied.

F07 – Output detected – Heater relay contacts stuck together.

Test (2) – Check output from relay with drive signal applied.

F08 – No output from relay – defective relay or drive circuitry

NOTE:- These tests cannot find an o/c circuit heater, wiring, module plug fault because the only way of detecting such a fault that I can think of would be to note a zero change in thermistor value after a preset heating period. As there is no fault code for ‘heater timeout’ this condition seems only detectable by conventional means ie. Failure to heat.

Eeprom data

Test – Does eeprom data correspond to the modules environment ie. correct model.

F09 – Corrupted data, incorrect / defective eeprom

Dryer thermistor

Test – Check resistance of thermistor against high and low reference values.

F13 – Faulty thermistor, IDC plug contacts/wiring, wiring, module plug, faulty circuitry on module.

Dryer heater

Test – No data but see NOTE after heater relay output.

F14 – ??
F15 – ??

I want to reiterate that these are only suggestions and I might be completely wrong. Chew them over for yourself and see what you think.

Andy

[Dave_Conway]

Re: Merloni error codes

Cheers Andy :tup:

Most usefull 😀

Dave.

[andy2]

Re: Merloni error codes

It has occured to me that the F10 code (Pressure switch not sensing correctly) may signify the operation of the pressure s/w flood level as this seems the only possibility left with regard to the P.switch. ❓

Andy

PS The only way to really check these out without help from Mr Merloni is to use a sort of reverse engineering technique and simulate these faults on a known OK machine, eg by detaching wires, using manual control of the pressure s/w etc. and see what fault occurs. I have tried this on older machines but few of the fault codes seemed to be implemented on these. Up to now I have not had an opportunity with the newer machines.

Maybe someone else could ?

[andy2]

Re: Merloni error codes

Well, that generated a lot of discussion!

I thought at least Mr Merloni’s boys would be down like a ton of bricks saying what a load of bullocks.

Maybe its time for a joke…….. 😀

OK!…… this goat walks into a pub…………Eh…What? you’ve already heard that one…..

Never mind, gotta go anyway someone just phoned with an Ariston…. timer knob keeps going round and round…………s gotta be the module i reckon! 💡

[Dave_Conway]

Re: Merloni error codes

andy2 wrote:gotta be the module i reckon! 💡

😆

[Goatboy]

Re: Merloni error codes

andy2 wrote:OK!…… this goat walks into a pub….

😀 😉

I’ll ask my own personnal Merloni man next time I see him.

[leavemetogetonwithit]

Re: Merloni error codes

Thanks Andy. I’ve printed this out ‘cos I reckon I’ll need it tomorrow.
Don’t know why it’s lying lost in the mists of time and hasn’t been moved to the error codes thread.
Mike.

[lerch]

Re: Merloni error codes

F13 = High Temperature Rise in Drying: Reduced airflow, check fan motor & filter for blockage.

F14 = No Heat when Drying: Check one shot thermostat, heater & module connections.

F15 = Drying Heater Relay Fault: Possibly open circuit.

F16 = n/a

F17 = Door lock error: check door, door lock & module connections.

F18 = Fault on Control Board: Check for damaged EEprom and Microprocessor.

Hopes this helps by finishing the list. 😀

[leavemetogetonwithit]

Re: Merloni error codes

I’m just bumping this so that Martin can have a read, ’cause it sounds like it might help him at this time. 😆
I’m nearly sure the motor triac will be the big one with a heatsink.
Mike.

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