BIASI m90 24s year of production 2005

[stefko27]

Hello

i have a problem with Biasi I recently changed the external thermostat and it was working fine till yesterday it is now not working according to thermostat also the first two lights flash the green and the red one which in manual it says frost protect operation. any ideas?

 

[stefko27]

Actualy now I did some questioning and found out that last night some of my roommates turned on the thermostat but the radiator in their room was closed so could that have any influence

 

[Agile]

It sounds like you have wrongly connected the thermostat.

Doing that wrongly risks damaging the PCB!

Tony

 

[stefko27]

Yes I had the same thoughts but i dont think it could be wrong Line on L neutral on N , Line on com and return to boiler on the remaining output could that be wrong

 

[stefko27]

also the boiler is working and heating ok but i need to manualy turn it on and of

 

[stefko27]

//www.diynot.com/network/stefko27/albums/

this is how i wired the thermostat[/img][/b]

 

[Agile]

Terminals 1-3 are meant to be VOLT FREE and you are risking damaging the boiler!

NEVER apply any mains live or neutral to those terminals!

The boiler manual is very clear about this!

Tony

 

[stefko27]

HMMM it was wired like that with an old thermostat and it worked fine as for the manual if i check at the diagram the blue wire as i understand as the neutral comes out of electric suply to external control correct me if i m wrong

 

[stefko27]

ok now i m reading a different manual and it actualy says what you wrote so i guess i was wrong then this means that i have to rewire everything?

 

[Agile]

I am always right!

Reading the manual is always the best way!

Tony

 

[stefko27]

good to know

but as to reading the manual i actualy cant find(or i m going blind) how to conect the external terminal to the pcb

 

[Agile]

NO to 1

Com to 3

With NO other connection to anywhere else!!!

It just needs a switch between 1 - 3.

When supplied the boiler just has a black wire loop between 1 - 3.

Tony

 

[stefko27]

yes that i understood but when i opened the boiler, 1 was connected to neutral and 3 went to pcb now i dont know where to wire 1 on pcb or i leave the 1 empty i think it has to go somwhere.

 

[stefko27]

//www.diynot.com/network/stefko27/albums/


here i posted a new image how it looked like without the grey one and the black one

 

[stefko27]

never mind i figured it out i feel a bit dumb now though thanks for the help i realized the mistake