Help with smd component

Thread Starter

marvoo

Joined Feb 2, 2013
4
Hello,
I have got a broken smd component, but I can't find out what it is and what the specs are.
It come's from a Vaiilant 370 thermostat.
On the package it has this info: EF 41 B and some logo. In another thermostat there is the same component, but with the info: EF 06 and the same logo on it.

Can anybody help me find out what it is, so I can replace it.
 

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Markd77

Joined Sep 7, 2009
2,796
It's a diode of some kind, but I think it could be a schottky, a normal silicon diode, a zener.
Maybe a photo of the board it was removed from would give more clues.
 

Thread Starter

marvoo

Joined Feb 2, 2013
4
I mada a photo from the board and a schematic, so far I can.
The component is making a short, so the thermostat didn't boot anymore. I removed it and now it boots. But it doesn't communicate. E-bus.
I guess it has something to do with filtering the communication signal out.
 

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Thread Starter

marvoo

Joined Feb 2, 2013
4
I started trying out some in hole components.
The thermostat works when I put an zener diode in place. Info on the zener is 5v1 83c.
Can someone confirm that this is a good replacement?
 

Thread Starter

marvoo

Joined Feb 2, 2013
4
I started trying out some in hole components.
The thermostat works when I put an zener diode in place. Info on the zener is 5v1 83c.
Can someone confirm that this is a good replacement?
I forgot to mention that the powersupply of the thermostat is 24V dc.
But it can work from 9 to 24V dc
 
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