Bosch WTE84107GB dryer stops during cycle

[bandgap]

Hi,

I have a Bosch Classixx WTE84107GB/01 condenser dryer that stops, usually during the ‘Cupboard Dry’ phase. Up to the point where it stops drying it seems to be working OK. When it stops there are no indications – no beeps, all LEDs are off. After about 7 mins the start switch LED flashes ready to go. Sometimes the dryer will restart OK after pressing the start switch and go through the complete drying cycle OK, other times it seems to try to start the motor two or three times then gives up.

I have cleaned the condenser and checked that the door filter is really clean but it makes no difference. The dryer is about 3 years old and is faily lightly used, about once per week on average.

Is there anything I can do investigate the cause of the problem further?

[linrew]

Re: Bosch WTE84107GB dryer stops during cycle

hi

do you have the FD number (4 digit number along with the serial number usually starting with 7 or 8)

when you say all lights are off do you mean as if the machine is completly dead or do you mean all the lights on the operating side (the ones on the left) are off IE start light is still on

if you switch it to off and then back on again, do you get any lights then or are you just waiting till the lights come back on?

my guess is a module fault or possibly an overheat fault

[bandgap]

Re: Bosch WTE84107GB dryer stops during cycle

Hi

Thanks for responding.

OK. The FD number is FD 8505 200329

When all the lights are off it’s as if the machine is dead, the start light is off as well.

If I switch off then on again I get either the start light flashing on some occasions or still completely dead on others.

The completely-dead situation recovers after a few minutes to a flashing start light.

Bandgap

[linrew]

Re: Bosch WTE84107GB dryer stops during cycle

hi

it sounds like an overheat problem causing this but this is very rare on these. (i have had motor over heat problems on these but not usually casusing the machine to go completly dead)

where is the appliance situated (in a garage/utility room or has it been built in/put under a worktop with some doors in front to give the apearence of built in).

it may sound like a stupid question but have you checked the plug and socket (dont bite my head off as i had the exact same porblem yesterday and the plug was not in all the way, cost the customer the call out charge as its not covered by the guarentee)

if there is plent of air around it and as you say the filters are clean then loggic would say module, part number 499428 about 142 quid plus vat from bosch.

linrew

[bandgap]

Re: Bosch WTE84107GB dryer stops during cycle

Hi

Liked the suggestion about the loose mains plug. Always check the basics!

The dryer is located in the garage and has plenty of space around it for airflow. However, it does look like some sort of overheating problem possibly on the module PCB.

After the machine shuts down it stays dead for several minutes even after the mains input has beed switched off then on again. It looks as though there is some thermal over-current protection on the PCB.

Anyway, as I am now resigned to buying a new module (at half the cost of a new machine) I removed the existing one and looked at it under a maginfier but the soldered joints look OK and no evidence of hot components. What I did find was that the contacts on the motor drive connector X11-3 had a thick oxide layer indicating heating. Cleaned up the pins, refitted the module but made no difference. Ah well.

I’ll let you know how the new module performs.

Thanks for your input

Bandgap

[nomadPaul]

If it occurs again , make sure you check your mains socket that the appliance is plugged in to i.e plug a table lamp into the socket to ensure the socket hasn’t cut out.
There is a logical reason for this – If there is a loose wire in the socket , it may be disconnecting after some time as having a high current through it causes it to heat up and possibly move away from its contact. The power comes on as the wiring cools down.

Sorry if you’ve checked this already but i always check the easiest solution 1st 🙂

[drleon]

Re: Bosch WTE84107GB dryer stops during cycle

I had a similar problem with Wte84107gb/02 FD 8511 201263. The dryer was switching off after few minutes with fast relay clicking (few times). Afterwards it was completely dead for few hours. I described my problem on polish electronics forum http://www.elektroda.pl/rtvforum/forums.html?l=en and the suggestion was to replace TNY266PN (Low Power Off-line Switcher) on the controller’s PCB. That fixed my issue.

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