Hotpoint WD420 one shot failures

[iadom]

Question for the Hotpoint bods. 🙂

I have just been to inspect a WD420 for a, no dryer heat, fault. ( also had one on Friday with dryer one shot failed)

The one I saw this morning is just over 15 months old and is covered by a Norwich Union household policy. Norwich Union have sent a firm from Stockport (DASA member 😥 ) begins with a ‘P’ 😉 .

They have been three or four times in past few weeks, fitted three cut outs, and changed the control module. The longest the machine has worked in the past few months is for two weeks. Last week it worked for 30 minutes after the last repair visit.
On inspection this morning the TOC had failed again. The machine is as clean as a whistle, no blockages, fan OK etc. The only fault I could see was a kinked grey outlet pipe.

Is there a known problem/fix for this failure.

And which design idiot decided to fix the cut out fixing screws from inside the heater box, absolute stupidity. 👿

[Gertrude]

Re: Hotpoint WD420 one shot failures

If happening after a wash perhaps the kinked drain hose was not allowing the water to drain from the clothes efficiently thus creating overheating within the drum.

You’ve probably thought of that, anyway.

[iadom]

Re: Hotpoint WD420 one shot failures

For future reference should anyone else have this problem, a little bird 😉 has informed me that there is a modified heater box assy that is supposed to cure this fault, hopefully. 🙂

Part number is 1605230.

[Dales-Electronic]

Re: Hotpoint WD420 one shot failures

Jim – Ive just been out to one of these today is it the 1605160 one shot 160C button stat that fits inside the heater box with terminals outside??

[iadom]

Re: Hotpoint WD420 one shot failures

Thats the one, just had a look on Partfinder and it lists the later heater box, different element, fluff filter and a filter hose ❓ done away with, also the machine now has a 3 way fill valve instead of a 4 way valve. You just isolate the unused valve. No changes to the electronics are required.

Changed as from date code 40.

[johnnyj]

Re: Hotpoint WD420 one shot failures

The reason the one shot screws in from the inside is so force you have to split heater box and check for fluff build up, you are correct Iamdom they have changed the heater done away with filter removed the valve also the one shot has changed to a higher rating i usualy just convert the whole lot with the 1605230 heat box all the changes in one go.

[iadom]

Re: Hotpoint WD420 one shot failures

Has it reduced the incidence of this fault johnnyj ?

[johnnyj]

Re: Hotpoint WD420 one shot failures

Yes i’ve never had a failure on one i’ve done had a couple on machines that already had the the latest fitted on production but thats been caused by a loose fan on the dryer motor causing it to jam, all in all it’s doesnt give much prob’s at all.

[Martin]

Re: Hotpoint WD420 one shot failures

johnnyj wrote:The reason the one shot screws in from the inside is so force you have to split heater box and check for fluff build up

Whilst I understand the logic of them fitting the one-shot TOC on the inside, but I cannot figure what the modification (1605230) is meant to alleviate? After all it appears the new mod still includes a 160 degree one shot? If users don’t allow the usual 10 mins cool-down, it’s gonna blow anyway, modified or not surely? Why can’t they use a manual reset one anyway? 😕

I must get hold of a WD420 service manual I reckon? :rolls:

….I still can’t figure at what point the hot valve is supposed to work? On a WD420 I went to today, I set it on a Whites 95 degree wash and it just filled with cold water..weird??? 🙁

[Bryan]

Re: Hotpoint WD420 one shot failures

Martin wrote:
….I still can’t figure at what point the hot valve is supposed to work? On a WD420 I went to today, I set it on a Whites 95 degree wash and it just filled with cold water..weird??? 🙁

Don`t want to go off topic here but funnily enough I was working on an Indesit WD12S yesterday and I was also slightly confused that it never called for hot water on any programme :?.

Thought it may have had something to do with the fact that there was no load in the drum :con:.

Bryan

[wilf]

Re: Hotpoint WD420 one shot failures

first one of these we sold the customer insisted it was faulty as it never took hot water. we checked ,it didnt ,then changed it for a tricity.

they must have had a lot of hot valves to get rid of!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

wilf :rolls:

[Flyman]

Re: Hotpoint WD420 one shot failures

Put it on a hot wash and it will pre-fill with cold water, it will then pause before filling to wash level with cold water. If the clothes are absorbent enough to drop the water level enough for it to do a top up fill it will use the hot valve. So they are not lying when they sell it as a hot and cold fill machine! Why they bother I do not know. 😕
New heater box uses the Indesit curly element as the original was breaking loose from the support bracket and causing noise and vibration. The filter has been removed so no need for the extra valve which was used to flush the filter clean. 🙂

[Martin]

Re: Hotpoint WD420 one shot failures

Much appreciated Flyman for that info, very good thanks! 😉

[iadom]

Re: Hotpoint WD420 one shot failures

Just to update this thread, the modified heater box listed above is no longer available, the new parts number is 1605710. however it is reported that pre date code 54 machines need eeprom reprogramme if this part is fitted. 😥

Jim.

[Author]

Posts