WD440p-pressure switch error – replacing did not help

[tinnerdxp]

Hello,
My first post and from reading the forum I guess I will hear the usual – Indesit PCB – £100 to fix

Anyway – here’s the full story:
Hotpoint WD440P – washer/dryer, bought second hand 9 months ago. Used once a week roughly. No issues at all..
After coming back from holiday – 3 weeks – switched it on on the usual program and it stopped half-way through with Pressure Switch Error Code:
f05 lights 2&4, pressure sw stuck on full.

Drained manually, cleaned the waste hose – slight blockage but nothing major,
cleaned the pump – nothing there – it spins fine.
cleaned the black pipe, and the filter with ping-pong ball in it…
Cleaned and blew air through the white pipe and transparent rubber hose going into the pressure switch – all good.
Checked the pressure switch – I hear click after some pressure, the switch is pressure tight, checked with multimeter – works fine…
Put it all back together – same thing – stops half way through on any program just before first drainage.
Took everything apart again to check the pump – pump switches on and spins freely when I blow air to the switch manually – so everything works fine…
Adjusted the switch to short under lighter pressure – still same error.
Ordered new switch – part number: 1604875, came brand new. Installed – same error…
Now after filling it 3 times by restarting any program, with half of drum full of water – disconnecting the hose from the switch releases the pressure and causes the bottom white pipe to fill up properly… but it just won’t drain…
When I blow the air manually into the switch – it works, when I connect everything – it doesn’t. Now after restarting it tens of times and blowing air manually – I get
f08 light 1. heater relay error… which is rather annoying.
It never flooded, looks “new” inside – dampers, hoses and other stuff, the pressure switch is definitely air-tight but it seems like the pressure caused by water is just not enough…

Is it PCB? Or have I missed something?
Appreciate all the help and suggestions.
I guess it’s just the way it is with Hotpoints… but then again maybe the PCB is repairable? I’m kind of into electronics so can probably resolder some stuff as long as it’s not SMD…

[Specialist01269]

Re: WD440p-pressure switch error – replacing did not help

Hi: Normally you have a small unit which comes off of the washtub, imagine a length of plastic tube. On 1 end you have a smaller tube that is attached to the outer plastic tub, probably at the front. The small tube on the other end has a pipe attached that then runs up to the preesure switch, basically what happens is that there is air in this vessel when the tub is empty. As the tub fills a small amount of water enters from the tub & displaces some of the air, this travels up the tube & presses on the diaphragm inside the pressure switch & activates it. As i said previously it only takes a small amount of muck to block the aperture on the tub.
When replacing the vessel after cleaning, make sure no water enters the tube as this will cause sensing problems.

[helo_75]

you probably just had a dicky pump tbh.,,,, f11 is failing to activate pump…. but the f8 is a whloe new ball game

[tinnerdxp]

Re: WD440p-pressure switch error – replacing did not help

Thanks for your replies.
I have cleaned everything really. The small hose (invisible on the photo) that goes from pressure switch to the black rubber pipe (2), the white plastic tube (1) that goes to the pressure switch using a tiny hose (invisible), and the pump itself (3). I can feel the pressure when there is water in the drum and I disconnect the small hose, also has tried to run the pump detached – it spins fine when I blow air into the switch manually.
Not sure about the f11 / f8 thing “Helo_75” mentioned.
I have a brand new pump as well but thought – if the old one works fine – why replace?
http://www.tinnerdxp.co.uk/wd440.jpg

[Author]

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