Finally the Swiss served as guinea pigs:

http://www.francesoir.fr/societe-sante/ ... rrefutable

I do not know the Okofen settings but on my Italian boilers you can adjust the hysteresis. The boiler can react to within 1 °. This is useful when making a system without a buffer tank. See if it's the same with them.
There are discussions about this forum who talk about Okofen logic

Hello,

it is true that for aesthetics it could have passed the wires behind. This does not change the proper functioning of the system.
I don't see crooked pipes in the photo.
Make a deduction of 5% until the complete completion of the work, it is legal it seems.

Here is a reasoning which seems to me a little too simplified. As long as the non-modulable park corresponds to the minimum consumption power, I do not see a problem. Now, let's take the day of 27/05/20 where the heating consumption is probably close to 0: we go down to 35 MW for a max ...

it's expensive, Italians are less than 200 €, unless there is a lambda probe

Ah yes, with 18m2 you have enough to overheat the pool too. Once it has reached 30 °, the overheating problem of the panels returns to n ° 1. As far as I'm concerned, I put the panel in a vertical position. Thus, in summer, the apparent surface is only half that of the panel and in addition I have ...

oh no, it's special.
wouldn't it be 2 fuse holders, bottom right? to check if there is one that is toasted.
Otherwise, yes it smells like the card to change

if you put 220V on A1 / A2 the relay should switch and the screw will turn.
Check that you only have 0.6v at the start of the card too (otherwise it's the cable)

A photo of the card? sometimes it's a current card ...

I noticed that the exchanger cools the solar circuit very much, I think my pump circulates water too quickly in the latter. In full sun, the temperature at the solar collector struggles to exceed 60 ° C. Notice, that was when the water was at 18 ° C, I think the more it ...

tell us the voltages you have across the relay