For me, you are in a constant curve, this is the position for the ECS according to the instructions (line 5)

You must be in line 0 (speed II) or line 2 (speed III)

If your installation is in twin-tubes, the instructions in paragraph 7.5 https://api.grundfos.com/literature/Gru ... 014888.pdf indicates to set to proportional pressure mode. Is this the case? (I only see speed III)

Too bad for me, it does not look like the usual hydraulic block from Okofen.

First point, your v3v pumps for hours before stabilization.
Would you have the precise references of the circulator and this v3v stp?

Good evening, the water law is too strong, it still triggers despite the cut-off hysteresis at 1K and there are probably many other things to study. A photo of the circulator (in operation if it is led) to see how it is configured. Is the flow temperature sensor securely fixed...

The boiler temperature, which varies in sawtooth over an amplitude of 25°: Shock: There is something wrong... Power not adapted? Incorrectly adjusted circulator? …? If I can have access to the time to check that all the parameters are correct, it would greatly facilitate the understanding of what it is...

A small return while waiting for the effects observed by Mob with compliant parameters.

The minimum boiler temperature was 80°
The heating set point at 80° also with a cut-off set at 76°
The maximum radiator outlet at 80°
In short, everything old-fashioned to simplify

The flow temperature is never stable, the circulator cuts out several times during the day, no doubt due to an ill-adapted heating curve and too low cut-off hysteresis. The two EH measurements are not useful for this problem, on the other hand it would be necessary to add the hot temperature...

Hello, To start, I propose to start again on reliable bases adapted to condensing models in the majority of cases. Anticipation 180 Hysteresis stop and start on 1K V3V opening 5 pause 15 closing 5 Evol T Hot ETC rise 0 Evol T Hot ETC adjustment range 0 The curve in form...

Without an interior sensor, how is it still possible not to install one in our time :shock: I think we had already exchanged quickly on this, being in perfect agreement. How can you imagine wanting to finely regulate an interior temperature (let's say to illustrate 20° during the day and ...

A piece of advice, always write down each change made. This allows you to go back probably to the old settings. It's true and I'm going to do it, now Did you touch the position of the v3v in manual mode? It happened to me once, I had to take it down a notch...