diff --git a/src/devices/ventilation.cpp b/src/devices/ventilation.cpp
index 8dcdf6605..6b41fb8d8 100644
--- a/src/devices/ventilation.cpp
+++ b/src/devices/ventilation.cpp
@@ -30,7 +30,7 @@ Ventilation::Ventilation(uint8_t device_type, uint8_t device_id, uint8_t product
     register_telegram_type(0x583, "VentilationMonitor", false, MAKE_PF_CB(process_MonitorMessage));
     register_telegram_type(0x5D9, "Airquality", false, MAKE_PF_CB(process_VOCMessage));
     register_telegram_type(0x587, "Bypass", false, MAKE_PF_CB(process_BypassMessage));
-    // register_telegram_type(0x5, "VentilationSet", true, MAKE_PF_CB(process_SetMessage));
+    register_telegram_type(0x55C, "VentilationSet", true, MAKE_PF_CB(process_SetMessage));
 
     register_device_value(DeviceValueTAG::TAG_DEVICE_DATA,
                           &outFresh_,
@@ -50,8 +50,9 @@ Ventilation::Ventilation(uint8_t device_type, uint8_t device_id, uint8_t product
     register_device_value(DeviceValueTAG::TAG_DEVICE_DATA, &bypass_, DeviceValueType::BOOL, FL_(airbypass), DeviceValueUOM::NONE, MAKE_CF_CB(set_bypass));
 }
 
-// message
+// message 0x055C, data: 08 01 11 17
 void Ventilation::process_SetMessage(std::shared_ptr<const Telegram> telegram) {
+    has_update(telegram, bypass_, 1);
 }
 
 // message 583
@@ -85,9 +86,10 @@ void Ventilation::process_ModeMessage(std::shared_ptr<const Telegram> telegram)
     has_enumupdate(telegram, mode_, 0, -1);
 }
 
-// message 0x0587, data: 01 00
+// message 0x0587, data: 00 00 64 00 64 0A 00 01 54 01 00 01 00 00 00 46 00 00 00 02 00 A3 00 A3
 void Ventilation::process_BypassMessage(std::shared_ptr<const Telegram> telegram) {
-    has_update(telegram, bypass_, 1);
+    // has_update(telegram, bypass_closing, 0);
+    // has_update(telegram, bypass_opening, 1);
 }
 
 bool Ventilation::set_ventMode(const char * value, const int8_t id) {
diff --git a/src/devices/ventilation.h b/src/devices/ventilation.h
index f76fc7185..d01dcd6a0 100644
--- a/src/devices/ventilation.h
+++ b/src/devices/ventilation.h
@@ -41,7 +41,7 @@ class Ventilation : public EMSdevice {
     uint8_t ventOutSpeed_;
 
     // handlers: 0x056B 0x0575 0x0583 0x0585 0x0586 0x0587 0x0588 0x058D 0x058E 0x058F 0x0590 0x05CF 0x05D9 0x05E3
-    void process_SetMessage(std::shared_ptr<const Telegram> telegram);
+    void process_SetMessage(std::shared_ptr<const Telegram> telegram); // 0x55C
     void process_MonitorMessage(std::shared_ptr<const Telegram> telegram);
     void process_ModeMessage(std::shared_ptr<const Telegram> telegram);   // 0x56B
     void process_BlowerMessage(std::shared_ptr<const Telegram> telegram); // 0x56B