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docs(advanced_features): 📝 describe both venting selection behaviours #814

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rhammen merged 1 commit into from
Sep 25, 2026
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docs(advanced_features): 📝 describe both venting selection behaviours #814

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7 changes: 6 additions & 1 deletion ADVANCED_FEATURES.md
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Expand Up @@ -210,7 +210,12 @@ The controller has a venting program that runs a pump in on/off cycles to push t
- **Venting runtime** (number, 1–6 h, **disabled by default**) sets how long the program runs.
- **Venting active** starts and stops the program.

To vent a pump: set *Venting runtime*, turn on the pump's switch, and turn on *Venting active* right after. On at least one unit the pump selection was dropped when *Venting active* didn't follow within a few seconds; if the pump switch has flipped back off before you got there, repeat both steps more quickly. While the program runs, **Circulation pump heating** (HUP) or **Additional circulation pump** (ZUP) shows the pump turning on and off — short pauses are part of the cycle, not a fault. Turn *Venting active* off to stop early.
To vent a pump: set *Venting runtime*, turn on the pump's switch, then turn on *Venting active*. Units differ in how they handle the gap between the last two steps:

- On some units the selection stays on by itself, and the selected pump may already start running before *Venting active* is on. The controller may not respond for a short while after each write, so if turning on *Venting active* doesn't take effect, wait about half a minute and try again.
- On at least one unit the selection was dropped when *Venting active* didn't follow within a few seconds. If the pump switch has flipped back off before you got there, repeat both steps more quickly.

While the program runs, **Circulation pump heating** (HUP) or **Additional circulation pump** (ZUP) shows the pump turning on and off — short pauses are part of the cycle, not a fault. Turn *Venting active* off to stop early.

The controller's menu also lists other pumps (BUP, ZIP, the brine/fan pump, mixer circuits). They are not exposed yet: which parameter selects which pump has only been confirmed on hardware for the HUP and ZUP ([#802](https://github.com/BenPru/luxtronik/discussions/802)).

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