KENWOOD KDW45X15 slimline dishwasher, E3 please help me find thermistor/stat

[magaduccio]

Hello – Owner of the above seeks help.
I now realise this is a crappy machine, and have learned my lesson. However I’m still reluctant to throw it away.
History
Drop-off in wash performance, now won’t progress in a cycle. Diagnostic gives E3 (couple of times to make sure).
Accessed gubbins, visually fine, checked water heater (30 ohm, fine). Checked pressure microswitch (because I could see it) on the side of heater, fine.
Can’t tell how to check thermistor/thermostat – where are they please?

[magaduccio]

PS I have photos but am struggling to upload them.

[electrofix]

post the photo on another site and post a public link to it

Dave

[magaduccio]

sorry I’m slow of thinking.
https://ibb.co/L1LsPg6

[magaduccio]

The bit with the two white thin wires is closed (does not conduct) – it is a tiny black proby thing, is that the thermistor?
The bit with the red-brown-black connector has two covered prongy bits, is that the thermostat?

[magaduccio]

for what it’s worth, the side view.
https://ibb.co/z7MFskS

[electrofix]

does not conduct on which resistance scale. this is probably a thermistor which could have a resistance up to 100,000 ohms

Dave

[magaduccio]

I didn’t fancy this guy’s 6-part odyssey https://eatingorangesandmakingids.blogspot.com/2015/10/kenwood-dishwasher-fun-kdw12st3a-part.html

[magaduccio]

Thankyou Dave, I now remember that conductance is relative – and how to use my multimeter. The resistance across the tiny black proddy thing is 14300 Ohms, at T= say 15 degrees.

[magaduccio]

This looks almost perfect against the NTC resistance-temp table I have.

[magaduccio]

which is 17.5k @15, 12k @20 degrees. So I’m guessing this is fine, leave that bit alone now. So I’m thinking that the 2-stubby prong bit with the 3 wires is likely the stat.

[magaduccio]

I have discovered that the bit on the black clip with the 2 stubby prongs is the turbidity sensor (which figures with the 2 prongs). So my search for the stat goes on!

[magaduccio]

It might be easier for me to test from the PCB, which is accessible nearby
https://ibb.co/DrFSZS2 can anyone direct me to the stat terminals?

[electrofix]

probably not as the ntc is the thermostat this is probably a turbidity probe

if the heater is ok and the ntc my next check would be the relay on the pcb
after first checking the wire from the ntc to the board

Dave

[magaduccio]

Great minds think alike. Thanks dave. It’s rather different from the one in the manual but I’ll see if I can figure it out.

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