All this information was in my first post.Except for the commentator's speed frequencies.I'm sorry this wasn't technical enough for you.I use google translate, this probably doesn't help us communicate either.

The maximum value is indeed that of threshold B005.the maximum value of B009 is necessarily identical to that of threshold B005.

Current temperatures are test values, I would change them based on actual conditions.The max value will logically be the maximum value of the AM2RTD module, namely 200°C.

The idea is to be able to manually start ventilation in the event of overheating.

Yes I understand the difficulty.

This involves the use of ventilation for a wood stove.

I want to use ventilation in several ways.

The first is automated.

Ventilation will start from threshold B002, and adapt according to the stove temperature, passing through B003 and B004 up to threshold B005.

This is the part of the program that works.

The second is manual, with the 3-position switch.It takes place in two stages.

1) in summer, to turn the fan when there is no fire (to cool the house).

2) in winter, if the temperature measured by the PT1000 probe exceeds 200°C, the ventilation no longer operates automatically, since the AM2RTD module is limited to this value.The stove will therefore overheat, you will have to start the ventilation manually.

This is an emergency situation which I hope will never happen.

This is the part I can't program

Did I manage to be clearer?

I'm not sure.

If I understand correctly, the current values ​​are the problem.

I used them to test the program with hot water...

The actual values ​​should be this.

Is this better for you?

If I understand correctly, once 180°C (1000 units) is reached, even if we exceed 200°C the value remains at 1000 units and the fan does not stop.

However, in my tests, I had to set B005 to 100°C because if the water was too hot, the fan would no longer turn.

If, as you say, there is no interest.There's probably something I'm missing.

And is it still possible to operate it in the "summer" condition, with temperatures lower than the starting values?