Hotpoint FDW20 dishwasher I’M lost for ideas :)

[techstein]

Hi All

the machine starts to fill up and the wash starts ,
water is thrown around and is heated ,

but after a while the ,
the wash and prerinse lights flash

the machine does not progress and flush the water out, and continue the cycle,

i turned the selector to reset wait a few mins try a new cycle and , but it does not start a new cycle as the old water has not been pumped out ,
Ileft the plug out a few mins tried again diff. cycles too but still the same issue.

then i wired the water pump directly to the mains it pumps the water out of the machine just fine,

so i know no blockages and the water outlet pump is good
i cheked the main PCB board all looks good there i reseated all connectors too.

then i took new cables from the water outletpump upto the pcb board
just incase the old cables were cracking under the door where they bend ,
but still the same issue

i disconnected the heater element in case it is tripping cicuit but still the same issues.

I noticed the antiflood device cable has 2 holes in its connector

but the device has 3 lugs on it ?? the top lug is longer than the other two

I used the top 2 as i Am sure thts is how it was when i first saw it , but
would like this confirmed ? as this connector is not keyed
with orange cable at top
and brown cable at the bottom

I Tried the machine with antiflood device disconnected.

anyone with any posssible ideas what the issue is , or what to try to troubleshoot ??

Update could this be a capacitor issue,,like the large one near the motor.??
or perhaps the supressor terminal
on this page

http://www.hotpoint-spares.co.uk/dishwa … 6&sort=20a

I am lost for ideas..hep required 🙂

[techstein]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

HI any ideas at all

[techstein]

Any techs out there 🙂

Any ideas at all, ??

is the capicator being used continuously while the machine is pumping around ??

I suspect it does charge and discharge its power rapidly to the big circulation pump

As i understand it all dishwashers start with a pump out as soon as a prog is selected , to remove any remaining water etc.

this machine never gets to the pumping out stage,
i was wondering what makes it move on to that stage after it has washed , or when a prog is first selected,

is it a relay or something..??

could the failture of the supressor terminal cause such issues or is it just an adapter ??
seen on this page

http://www.hotpoint-spares.co.uk/dishwa … 6&sort=20a

thanks for any possible suggestiions

Read more: http://www.diynot.com/forums/viewtopic. … 97#1970297#ixzz1KfpJiI1f

[kwatt]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

Several ideas, the most pertinent being that the application of mains power to components to check them is extremely dangerous, very foolish and can blow them.

Yes it should drain out before filling to clear the sump.

No the motor capacitor will not affect that as it’s a completely separate pump for the wash.

It could be the board, could be the pressure sensor IF the pump is operating correctly but putting mains voltage onto it directly isn’t the correct way to determine that.

HTH

K.

[techstein]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

Thanks for the response Kwatt,
and concerns, re: livepower direct

Just to clarify all other connections were disconnected ,
and the pump was isolated,from other electrical components with the machine unplugged and powered off , I should have mentioned this in my post hindsight is great 🙂

I think these have a pressure switch and also a pressure sensor Im not sure ?? can you confirm please ..

as the hose from the pressure switch goes into the sump

I checked this is clean and drops after suction is applied to ensure it is not jammed ,and the pipe is clear.
not sure if there is nay other check for this switch,if i am correct this device is circa 2 inch in diamater and round.

I reckon these also have a pressure sensor , betweeen the big circulation pump, and the spray arm , i will remove and clean it.If i see it

thanks will keep posting til resolved either way so other can maybe benefit.

Thanks for possible suggestions..

[techstein]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

Hi Kwatt is this the pressure sensor you mention

http://www.espares.co.uk/part/dishwashe … sure-.html

found a picyure of the pressue switch it is the round brown device as i thought

[techstein]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

HI Done abit of testing on the water level switch it seems suspect , imho..(when i mention switch i am referring to the
device that is 2 inch in diameter and round , and works like a diaphragm with air pressue.

Testing as as follows with multimeter set for continuity test..

no pressure blown down pipe
1 & 2, no continuity
1 & 3 yes continuity
2 & 3. no continuity <<<<<<<

with pressure blown down pipe
1 & 2, continuity
1 & 3 no continuity
2 & 3. no continuity <<<<<<

as connectors 2 and 3 both show the same state (No continuity) with air blown down or not i presume this is faulty ,

does my test seem logical..
thanks

[kwatt]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

Yes, this is the pressure sensor in the store.

We don’t get fault finding info to that level, we have to work it out just as you do. The fact that there’s no continuity across two terminals doesn’t guarantee a fault on the component but it does sound suspect.

HTH

K.

[iadom]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

Neither the pressure sensor or the pressure switch will stop the drain pump from working.

You have either got a faulty PCB or possibly main circulation pump motor.

[iadom]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

techstein wrote:HI Done abit of testing on the water level switch it seems suspect , imho..(when i mention switch i am referring to the
device that is 2 inch in diameter and round , and works like a diaphragm with air pressue.

Testing as as follows with multimeter set for continuity test..

no pressure blown down pipe
1 & 2, no continuity
1 & 3 yes continuity
2 & 3. no continuity <<<<<<<

with pressure blown down pipe
1 & 2, continuity
1 & 3 no continuity
2 & 3. no continuity <<<<<<

as connectors 2 and 3 both show the same state (No continuity) with air blown down or not i presume this is faulty ,

does my test seem logical..

In a word, no your test is not logical.

The pressure switch has 3 terminals, for sake of argument 1 is line in, 3 is line out when no pressure,
2 is line out when pressure is applied.
Why do you think there should be a connection between 2 & 3 ❓

Most of your other procedures are highly suspect and has already been mentioned downright dangerous as well.

[techstein]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

Thanks kwatt

I took the pressure sensor of too,
appears that is faulty,

basically it has 2 connectors , and continuity is good
but blowing or sucking down it moves the insides but not enough to break the contact continuity which it should , it will do if i apply pressure from a footpump or such, 😀
thanks for advice
posting this so it may help others
techstein..

[iadom]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

techstein wrote:
posting this so it may help others

To any ‘others’ reading this, please do not follow any of the unnecessary or dangerous methods or procedures outlined above. There is nothing wrong with the pressure sensor, or the pressure switch. Both of them are working exactly as they should and have nothing at all to do with a drain pump fault. :rolls:

[techstein]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

Hi Iadom,you mention ..

In a word, no your test is not logical.

The pressure switch has 3 terminals, for sake of argument 1 is line in, 3 is line out when no pressure,
2 is line out when pressure is applied.
Why do you think there should be a connection between 2 & 3 ❓
Hi Iadom,
Most of your other procedures are highly suspect and has already been mentioned downright dangerous as well.

Not sure you read all my “Second post , the device was isolated ,it its clearly mentioned in the second post,not in the first hindsight 🙂

The device (Pump)is not in circuit how can that be dangerous , ??
it is basically the same as plugging a lamp in or switching a fan on . or switching a pump on as in this case.when isolated.

ok the pressure switch has 3 terminals,

I would expect their are 6 possible states
3 with air pressure
3 without air pressure

I expect imho
the states to be opposite
when air pessure is applied ,
does this not sound logical.??

what are your thoughts on the high pressure sensor test I mention above?
does that seem logical

please do expand /enlighten

just saw you mentioned a drain pump fault,
the actualpump works perfectly well please clarify..?

Your technical expertise would be appreciated.

techstein.. 💡

[Jackal]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

To Be Honest techstein, IMHO you are out of your depth on this one and your postings will not help others in a similar situation but rather could hurt someone or damage their equipment.

I, like Iadom suspect a faulty PCB or circ pump. Component testing in the manner your are doing is dangerous. Some components run at different voltages regulated by the PCB and other components within the appliance, simply disconnecting everything else and applying mains voltage to the component you wish to test is dangerous and to be frank stupid.

Sorry it is not what you want to hear, but your safety and the safety of others reading this thread is more important than a dishwasher, it can be replaced you cannot!

Regards

Jackal

[iadom]

Re: Hotpoint FDW20 dishwasher I’M lost for ideas 🙂

Sigh,

A three terminal pressure switch has only two states, either open or closed. so the internal connections are either 1 to 2 or 1 to 3, that seems simple and logical to me. Why would you expect three or even six states. ❓

The pressure sensor is a totally different device, it is only there to sense if the water pressure in the spray arms has dropped due to a faulty circulation pump or blocked filters etc. It has to drop below 0.15 bar before it activates.

Once again I will tell you that the pressure switch and the pressure sensor have nothing to do with a drain pump fault.

Not sure you read my post correctly either, I said your fault is almost certainly a PCB or MAIN CIRCULATION PUMP fault. On certain models (serial number would identify) the drain pump is routed through the main circulation pump. If the main motor TOC trips then the machine will not drain out.

We will have to differ on the safety or otherwise of your methods.

[Author]

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