Junkers FR120 + Junkers Cerapur ZSBR 7-28 A 23 S5800

[Drogar]

Hello

I'm writing on english because I do not know german.
Just got used Junkers FR120 thermostat regulation and installed it on Cerapur replacing TW2 corrector. The problem is that it doesn't work. It does nothing to boiler. Connection is 1-2-4. Brigde is on 8-9 and on Ls-LR. This is default, I didn't changed it. Also I have hot water tank Junkers ST 120. FR 120 displays that hot water function is not available. I've reset it to factory settings right after installation. Does someone has experience with this combination ? Thank you.

 

[ColoradoRichard]

I do not know these boilers or the Thermostats...However..Did you check the fuses on the control panel that i can see in the pictures.
Reversed polarity,Bad grounding, is also a thing to consider
Junkers is a large German boiler manufacturer and i hope you are in good hands on this site..

 

[Drogar]

All the info I found on the internet said that these components are compatible but it seems that some "expert level"adjustment is needed.