NICR 720 Too hot

With this machine, the message "Too hot" appears after the steam has been drawn, if you start the coffee drawing afterwards! I don't understand that because I haven't found a similar case in any forums so far. In addition, this problem is not mentioned in the operating instructions. Who knows this error or where could the error be? What value must the NTC have at 20 degrees?

What don't you understand about that? A boiler too hot to brew coffee tastes like shit.

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KVA:WMF 800 ST: Lelit Bianca PL 162

Open the HWD valve, let off the steam and then hot water. It'll be all right. Normal reaction of the machine when it is too hot.

HWS

I understand the symptoms absolutely! But why is the manual pretending that the problem doesn't exist? It says: "Draw milk foam, press coffee cup and that's it. Another question is why this stupid problem does not exist in the identical BSH models. (Have repaired and tested several such devices in recent years!)

After the milk froth has been obtained, the instructions again state the
press the steam button (to exit the steam mode)
and then make coffee!
page 14 left column 2. Arrow from below. BDA complete
read and the explanation is provided

Greß
BS

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Ich schaue hier nur noch ganz selten vorbei.
In verschiedenen anderen Foren bin ich mit
dem gleichen Nickname zu finden, falls mal
jemand Hilfe benötigt kann ich vielleicht dort
helfen.

Hello again,
technically everything does of course right. I checked with the Nivona Service and got the tip to descale the machine intensively. Decalcified manually with highly concentrated decalcifying mixture. Didn't make any difference. Before decalcifying, I would like to check the NTC at the thermoblock, but I don't have the setpoint (e.g. at 20 degrees). Who knows the value?

The value is about 10,79 kOhm.
A new one costs at <komtra.de> 7,90 Eur.

HWS

I don't want to deny you're using the device properly either.

However, in your introductory post you did not describe exactly this operating step
(switching off the steam readiness before a cup of coffee).
On the contrary, it rather reads as if you want to draw coffee directly after a cup of steam < br> which then does not work due to excess temperature.

What should one think of as an inclined reader/tipper?!?

Greß
BS

--------------------
Ich schaue hier nur noch ganz selten vorbei.
In verschiedenen anderen Foren bin ich mit
dem gleichen Nickname zu finden, falls mal
jemand Hilfe benötigt kann ich vielleicht dort
helfen.

Hello,


at 20°C it should have about 12 kOhm.
Your would be plausible.
Had also NTCs, which didn't work properly with rising
temperature.

Yours seems to be fine - 100%
but you can only exclude it after a
exchange.

greeting
BS

--------------------
Ich schaue hier nur noch ganz selten vorbei.
In verschiedenen anderen Foren bin ich mit
dem gleichen Nickname zu finden, falls mal
jemand Hilfe benötigt kann ich vielleicht dort
helfen.

Here are the current facts of my Nivona research:
Had unscrewed the NTC, it had been mounted without conductive paste, but this did not bring any improvement in the subsequent assembly WITH conductive paste. I compared the temperature behaviour in the disassembled state with a similar NTC: At 18 degrees both had approx. 13 kOhm, at 30 degrees approx. 9 kOhm. That seems okay. Then I measured the temp. directly at the thermoblock: About 92 degrees. With steam readiness up to 125 degrees. When I then open the steam tap and measure the steam temperature, it drops to about 75 degrees within a few seconds. Is this an indication that calcification is still too strong? Recently he had descaled intensively twice, without a descaling program: descaling agent filled in highly concentrated and within 2 hours 5 times steam tap opened for approx. 8 seconds. If you switch off the steam after steam is drawn, the boiler will still have approx. 110 degrees for several minutes, is that normal? When I then press the coffee cup, it shows "Too hot" after a short run-up of the BG and lets some water automatically run into the drip tray. If I then press coffee again, water is drained a second time until the temperature of approx. 92 degrees is reached. Is there only one possible error in the controller?

Hello,

I don't know where and how you measured exactly the75°C.
But steam should always be above 100°C otherwise it would be
no steam?!

that the heater cools down slowly after switching off the
steam readiness seems normal to me - as long as no water
or similar is used.

I don't see a sign of calcification after your
description, but I don't have a meaningful explanation
for the behavior of the device - maybe something with the
electronics - maybe not; I can't judge from a distance
without having the device in my hands.

greeting
BS

--------------------
Ich schaue hier nur noch ganz selten vorbei.
In verschiedenen anderen Foren bin ich mit
dem gleichen Nickname zu finden, falls mal
jemand Hilfe benötigt kann ich vielleicht dort
helfen.

It is becoming increasingly difficult to give helpful advice here. If it belonged to me, I'd dismantle it into almost every piece. Hardly anything else will lead there to the goal.

HWS