Hotpoint Dwf40 – Fill then drain

[Thorvaia]

Hello all, first time poster!
I have a strange issue with my hotpoint dwf40 dishwasher. I switch it on, and it starts the draining cycle, then starts filling up (have taken the side off and watched it, plus have opened up the door to see the water in the machine), but as soon as it fills, the drain pump kicks in, and then i get the first and third lights flashing (prewash and rinse). The manual states that this could indicate blocked filters, but i have checked and all is clear. I have also checked the bottom incase the anti-flood sensor had tripped, and all is dry (have even tried disconnecting the sensor). Not sure what else to try? Ive taken the drain pump off, and all is clear (it drains fine, it doesnt seem to then start pumping the water?)

cheers

Rich

[electrofix]

will need more numbers off the label to get accurate fault data

Dave

[Thorvaia]

electrofix wrote:will need more numbers off the label to get accurate fault data

Dave

Hi Dave, what other info would be useful?
Cheers

Rich

[electrofix]

the label
contains
the full model no ( yours is incomplete )
commercial codes ( there are often more than one machine with same model no)
serial number for changes within a production run

Dave

[Thorvaia]

electrofix wrote:the label
contains
the full model no ( yours is incomplete )
commercial codes ( there are often more than one machine with same model no)
serial number for changes within a production run

Dave

Hey Dave, there are no labels on the frame (where they normally are), i found a sticker under the lid, which has no serial, but has a date (31/07/03). The model is a DWF40P. sorry, cant be more helpful 🙁

[electrofix]

fault is a wah motor fault

if unit fills and wash motor does not run you get the fault

with the age of it its likely the motor capacitor may be defective. if the motor is free and it buzzes slightly or tries to go before the programme aborts then its probably that

Dave

[Thorvaia]

electrofix wrote:fault is a wah motor fault

if unit fills and wash motor does not run you get the fault

with the age of it its likely the motor capacitor may be defective. if the motor is free and it buzzes slightly or tries to go before the programme aborts then its probably that

Dave

Hi Dave thanks for coming back to me so quickly!
I had had a look at the wash motor tonight, first i checked the capacitor with a mulitmeter, and it seems to be working. I next removed the wash motor and benchtested it. It seems to work, although it doesnt seem that powerful. Not sure how fast these are supposed to spin, but it wasnt quick.

not sure if its still the motor, or maybe something else?

[electrofix]

check to see if motor energises

also check wiring as it leaves the bottom of the door. wires break there

Dave

[Thorvaia]

the motor doesnt seem to energise, there is a hum but that seems to occur with the motor disconnected. i’ll check the wires near the door

cheers

[Thorvaia]

Thorvaia wrote:the motor doesnt seem to energise, there is a hum but that seems to occur with the motor disconnected. i’ll check the wires near the door

cheers

right, i have carried out a few tests but no idea what they mean!

1. if i remove the pump power supply, the drain pump doesnt run
2. i probed the pump, and when switched on, its sitting at 80v, and then when the program starts, it jumps to 230V.
3. with the drain pump disconnected (and the drain pump connected), the wash pump seemed to come on
4. the humming noise seems to be from the water inlet solenoid

wondering if there is an issue with the drain pump, which i causing the voltage to drop for the wash motor, but assuming that would trip something

cheers

[electrofix]

Thorvaia wrote:

right, i have carried out a few tests but no idea what they mean!

1. if i remove the pump power supply, the drain pump doesnt run
2. i probed the pump, and when switched on, its sitting at 80v, and then when the program starts, it jumps to 230V.
3. with the drain pump disconnected (and the drain pump connected), the wash pump seemed to come on
4. the humming noise seems to be from the water inlet solenoid

wondering if there is an issue with the drain pump, which i causing the voltage to drop for the wash motor, but assuming that would trip something

cheers

confused now
you removed the pump power supply and the drain pump does not run Eh ??

we need to be clear as both motors are pumps. con you be more specific as to which pump your talking about as the above looks like you unplugged it and it did not run. which makes sense as things dont work when they are not plugged in

Dave

[Thorvaia]

electrofix wrote:

confused now
you removed the pump power supply and the drain pump does not run Eh ??

we need to be clear as both motors are pumps. con you be more specific as to which pump your talking about as the above looks like you unplugged it and it did not run. which makes sense as things dont work when they are not plugged in

Dave

doh you are right! apologies. retyped

1. if i remove the wash pump power supply, the drain pump doesnt run
2. i probed the wash pump, and when switched on, its sitting at 80v, and then when the program starts, it jumps to 240V.
3. with the drain pump disconnected (and the wash pump connected), the wash pump seemed to come on once, but not again
4. the humming noise seems to be from the water inlet solenoid

that should make a bit more sense[IMG2=JSON]{“data-align”:”none”,”data-size”:”full”,”src”:”https://www.ukwhitegoods.co.uk/forums/core/core/images/smilies/icon_lol.gif”}[/IMG2]

[electrofix]

does the timer in the door of your machine look like this ?

Genuine Hotpoint Dishwasher Programmed Control Module – C00143206 5054127001186 | eBay

Dave

[Thorvaia]

electrofix wrote:does the timer in the door of your machine look like this ?

Genuine Hotpoint Dishwasher Programmed Control Module – C00143206 5054127001186 | eBay

Dave

yes it looks the same

[electrofix]

ok if you feel up to it and soldering

change the x2 capacitor in the middle. in the pic its a 1uf 305v x2 capacitor

this provides the power to the board. as they age its like batteries getting old and it cant provide enough power and board crashes or has not got enough power to start various components
is a long shot but an educated one. plus its a cheap component

Dave

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