Neff dishwasher E09 code, replaced Heat Pump now water not heating

[Lazy Farmer]

Just tested the replacement pump and getting a reading of 20.4 ohms

[electrofix]

as professionals we use 2 or 3 main suppliers
non of them have a replacement pump for 651956. Thats part of the reason I tagged Kenn in to see if he knew because he has his pulse on spare parts due to the site shop. Also if these pumps are swoppable why does bosch not say so and why is noe motor a lot dearer

also the machine uses the motor current to detemine various things. if the motors are electrically different it wont work properly

I cant promise if you buy the correct pump it will heat but I would suspect its a possibility

Dave

[Lazy Farmer]

Thanks Dave & Kaibart.
I think I best return this pump & buy genuine 00651956
i will let you know how I get on.

[Lazy Farmer]

Just fitted a genuine heat pump & all seems well. Interrupted a cycle after 30mins to clouds of steam & hot water.
Thank you for your help

[electrofix]

Lazy Farmer wrote:Just fitted a genuine heat pump & all seems well. Interrupted a cycle after 30mins to clouds of steam & hot water.
Thank you for your help

no probs
so the website you bought the pump from is wrong, their pump wont replace yours
its good info for us but been a lot of hassle for you

glad you got it sorted

Dave

[Lazy Farmer]

5 weeks after fitting the genuine Bosch/Neff
replacement heat pump the machine has E09 showing again.
Is it likely that the new pump has failed already or could it be something else?

[electrofix]

well its not unheard of as the heater on these unit are very weak

if the water flow through the unit is too slow due to blocked bars or filters then these units can blow

there are other reasons but its a pity the older models almost never blew heaters

Dave

[Lazy Farmer]

Thanks Dave
How would I test it with a multimeter?

[electrofix]

meter on low ohms scale
remove large side plug
test between the 2 terms where the red cables connect
readings below 100 ohms are ok

Dave

[Lazy Farmer]

The supplier is replacing the pump.
You mentioned other reasons a pump may fail – are there any tests that can be done before fitting the new pump as I don’t want another failure.
The original pump worked for 7 years, the replacement worked perfectly pretty much daily for 5 weeks including Christmas so I imagine the rest of the machine is all okay.
The area where the pump fits was clean & dry & the pump was unmarked. But no ohm reading across the red contacts at all

[electrofix]

check filters
check wash bars for blockages

your unit also has an alternative wash distributor. this is a valve that alters the flow to each bar. to make sure its working you should hear sound changes in the dishwasher every now and then as this valve pushes more pressure to upper or lower bars

the last thing is a module failure but not easy to check. if the heater contol relays stick closed. it is unlikley as there are 2 relays that need to close to operate the heater

Dave

[andyjawa]

Well I think I hold the record for failure of a Bosch/Neff/Siemens heat pump replacement and that is under 3 minutes after it filled and the soap disp opened ( was tested on quick wash or in this case: Quick Fail! ). Of course it was a built-in contraption, actually it was a badly built-in affair to make matters even worse..Usual lash-up…by God I was fuming! Was the last heat pump I ever changed too. So the point is could just have failed (E09 ) which would not surprise me in the least, think I had a good 5 before this particular d/washer that took out the heater again which is why I gave up on them. To my mind there is a basic design flaw with them, that and the common e15 flooded underbase = drain pump on forever with door closed or even open. This happens very commonly with the s/steel tank set into plastic base as the plastic warps especially r/h/side and at the rear and over a short period of time the water builds up as the usually small leak fills up the underbase to trip the emergency float switch which switches on the drain pump.
Horrible pieces of engineering..

[Lazy Farmer]

I am now struggling with an intermitent water leak into the base. After I replaced the heat pump all I left the front lower inspection panel off so i could check & after 5 or so cycles it was bone dry, including the polystrene floating disc section. Then randomly one day a big puddle appeared in front of the machine & I found an inch of water in the base. Dried it all out then spent an hour and a half lying on my front looking in whilst it ran through a cycle – not even a drip.
Any ideas what is happening?

[Author]

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