Indesit wd12uk, w103

Re: Indesit wd12uk, w103

The dreaded WD12 and W103. Try these :
1 dry the board with a hairdryer & then get a fine wire brush and scrub the green side. Get the customer to ventilate the kitchen better
2 change the carbons (even if 90{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} left on them – uneven wear can cause timer rotation)
3 tighten edge connectors with stanley blade (each pin). On the tiny edge connectors where it is not possible to get a blade in – pull them off, nip them hard with your fingers and replace.
4 check thermisters (about 25-40K when cold). Remember that the WD12
has 2. The one on the top of the tub is the favourite one for going open circuit or the wire to it snapping.
5 check heater for earth leaks
If all this fails to get the machine going, send the board to us for test. Make sure you mark the model number on the board.
Tony http://www.emwelec.co.uk

Re: Indesit wd12uk, w103

Can’t understand why everybody distrusts the error codes on these machines to the extent that that it is the last thing to be checked. In my experience code 8 is usually pretty accurate and is faulty heater relay contacts. In most cases changing the relay sorts the problem. The microcontroller monitors the output from the relay and if it does not get any response signifies this error.

As these little relay contacts handle all the heater current, common sense says that they are a prime failure point, but it is also very possible for this to be an intermittant fault so checking the board does not necessarily uncover the problem. It is better to change the relay to make sure. At £1 for the part and 5 mins to do the job it is an easy way to eliminate the componant.

I know that these machines are a pain and i hate them as much as the next person but to be fair i have had one of these rigs on my bench and simulated most fault conditions. Most times the error report is accurate although sometimes the time it takes to report the fault varies a huge amount.

Having said that, using a rig on a bench is a lot different to in an environment where the board can become damp due to condensation. This can easily produce spurious errors due to the high impedence nature of IC I/O’s on the board.

So first make sure the board is bone dry and clean as Tony advises.

Andy 😀

Re: Indesit wd12uk, w103

Hi Martin

These relays are very common I usually get mine from CPC

PN:-SW01454 – 12v

The Heater relay is adjacent to CN1.

Andy 😀

Re: Indesit wd12uk, w103

I have replaced the board for F8 before not knowing the relay can be purchased. What is CPC?
Regards,
Mike.

Re: Indesit wd12uk, w103

These boards are notorious for ‘tracking’. This is where damp builds up on the board causing voltages to jump across the tracks. Better design with tracks further apart would stop this. In time, carbon deposits are formed where tracking has taken place. This then makes the board less and less reliable as the voltages now follow the carbon trail. Brushing the board with a fine wire brush clears the sooty deposits making the board more reliable. Advise the customer to ventilate the kitchen more and hopefully the damp or condensation issue will not return.