Ultima WD860 showing F -13 how can I fix it?

i found this in the archives for 2007 thanks to lee kenny

I have a WD860 and had exactly the same problem as you describe.
I was able to fix this myself with no specialist knowledge and it took about 2 hours, because it was unfamiliar and annoyingly fiddley! I bought the parts - two thermostats for £10 from a 'local' repair shop (I was lucky there, as prices online were twice that!). From what I’ve read the rule seems to be replace both thermostats to be safe. These components look rather like cylindrical bits of plastic wearing tin hats but one is twice the size of the other, the larger being about 2 cm in diameter, and they DON'T look identical. The part numbers (for my WD860) are: HPT 1605 160 and HPT 1604 802. The first part can be found easily on the web - just bash the numbers in - and according to some sites is the right part for a WD865A. The second part is more elusive – mine was manufactured by ELTH and is in the 279 family of temperature sensors. I can get a photo of it online but most amazingly can’t find anyone selling one online!
So assuming the WD865 is basically the same as my WD860 and bearing in mind I’m writing this from my slightly fading recollection:
1. You’ll need to use a combination of finesse and brut force to get the lid off of the machine. It is secured by two screws at the rear but has troublesome plastic hooks inside, half way down either side, that stop the lid from riding up at the front. The process is to remove the screws and then pull back and up to ‘unhook’ the internal brittle plastic hooks. I found this scary and difficult, cracking sounds were off putting and I did break to tips of the plastic hooks a little but they still seem to work ok. Be careful and wiggle it gently from side to side is the only advice I can offer.
2. Once inside it gets a bit easier. You should be able to see a metal snail-shaped object bolted to the top of the drum with various electrical connections – this is the dryer and within it are the two thermostats. What you’ve got to do is remove/unplug all the electrical connections from the top dryer, of course, make a diagram first as you’ll need to put them all back after. You then need to unbolt/unscrew the top half of the dryer and remove this from the machine – this is another fiddley bit and I was lucky again here to have a very small ratchet socket set which made the hard to get to bolts/screws accessible. Note: some of the screws are the Torx type, I believe that’s what they’re called, end-on they look like a six pointed star (imagine a more complex Phillips’s type screw). You’ll need to have a Trox type screw driver head that’ll fit the small socket tool to undo these.
3. Once the top of the dryer unit is off, you just need to remove the thermostats – one is fixed in by screws on the outside of the dryer top and the other is fixed in by screws on the inside. Screw in the replacement thermostats, then clean off the fluff and burnt fluff from both halves of the dryer and you’re there – put the machine back together.
Hope this helps….
Cheers,
Lee.

Lee Kenny
September 2007

wireman
August 2009