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Eight flash job. Checked all connections, changed pressure switch, had module checked out at Qer. Works once or twice then reverts to 8 flash error mode. Any suggestions ( apart from the obvious directions to the nearest tip). Machine is under 2 years old and lightly used. Can the selector control/timer cause this as an intermittant fault ?
Re: Indesit W12SUK
NTC in heater or Heater connections can lead you a merry dance if not fully checked :lesson:
Re: Indesit W12SUK
first thing I checked, problem is these wires are so flimsy you only need to look at them to make them fail 😥
Re: Indesit W12SUK
Penguin45 wrote:Intermittant heater relays is the one I keep coming across.
Chris.
I wonder if something like this would not show up on test at Qer. I marked all the relays on the board before I sent it for test and none had been changed, the board came back NFF.
Re: Indesit W12SUK
You’d have hoped so. Do they load load them to 2kW?.
I keep the relays on the van and have about a 50{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} success rate – there seem to be associated problems with the control circuits which Andy2 will no doubt enlighten us to when he spots this!
Chris.
Re: Indesit W12SUK
I’m not knocking QER, but don’t think they do a soak test which is essential on these. These boards have subtle faults and it takes a lot of patience and research to truly fault find on them. You could send it to us for test (we charge much less than QER for tests) AND we return it with a checklist of other items to check on the machine if it is no fault found. Watch out for uneven wear on the carbon brushes (even with 90{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} life left on them) as this can cause the dreaded timer rotation. Tony EMW
Re: Indesit W12SUK
Well Chris you have me sussed, OK I admit it, I do have a ‘thing’ about Merloni (sorry Indesit Co) machines and especially modules.
There i’ve said it!
Maybe this is my first step to recovery from the morbid fascination which
has ruled my life for what now seems a lifetime………endless nighmares………..a dreamworld filled with flashing lights and endless clicking noises that fill my ears and my mind until it seems that I can endure no longer……………😯 😯 😯 😯
Re: Indesit W12SUK
C’mon – you’re the one who might just be able to offer a spot of enlightentment as to why and what from a technical point of view, instead of my intuitive one……..
Wattly welays – that wascly wabbit…….. 😆
Chris.
Re: Indesit W12SUK
andy2 wrote:Maybe this is my first step to recovery from the morbid fascination which
has ruled my life for what now seems a lifetime………endless nighmares………..a dreamworld filled with flashing lights and endless clicking noises that fill my ears and my mind until it seems that I can endure no longer……………Calm down old chap, get a grip, anyway, what clicking noises??? :rotl:
Re: Indesit W12SUK
Well i agree with you Chris, I have found F8 to usually be the relay.
The drive circuit from the microcontroller is pretty simple. Output is from pin 42 which goes to the IC ULN2003 pin 1. This device has seven high current darlington driver stages one of which is used to drive the heater relay coil. Output to the relay is on pin 16. The relay switches the neutral supply to the heater.
Feedback from the heater relay is through D1, R3 to pin 39 of the controller chip.
I reckon that the microcontroller switches on its output to the relay and monitors the feedback on pin 39. If the relay is sucessfully activated a return signal is received pulling pin 39 low. If there is no output then an F8 error condition is raised.
Obviously a failure of any of these componants will cause the problem, including a defective track, but the relay is prime suspect. As this is a simple on/off signal it’s not difficult to check through the circuit to trace the source of the fault.
Supply from the relay to the heater is through socket CN1.
Interestingly the other wire from CN1 goes to the pressure s/w and pulling this plug raises an F10 ?? (Pressure switch not sensing correctly) which is a bit of a mystery code as there are two other pressure s/w codes that seem to cover most problems.
F04 Pressure switch jammed on empty
F05 Pressure switch jammed on full(If you ever receive an F10 check the very narrow track that runs adjacent to CN1 connections. If the board becomes damp tracking can occur due to the close proximity.)
The processor will allow two attempts to pull CN1 plug and reconnect but aborts the program on the third try. I did wonder if this code might activate on a flood condition but now tend to favour it signalling a complete loss of feedback from the pressure s/w (but only guessing)
Andy 🙂
Re: Indesit W12SUK
for God sake Andy! it’s 2 O’clock in the morning!!!
Are these relays readily available to change in the field? I usually give up on circuit repairs if I can’t see a defective track.
It does make you feel good if you can repair it rather than give up… and the customer loves it.
Bob
Re: Indesit W12SUK
yep! Thing is, i was stacking ‘z’s on the sofa for most of the evening woke up at 11pm bright eyed and ready for a hard session on UKWG.
And yes CPC have these at 92p + VAT
SW01454 (12v)
SW01455 (24v)Seme @ £1.35 + VAT (12v)
REL-11202
CDSL – almost certainly no part no though 😥
Andy 🙂
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