diff --git a/src/core/locale_translations.h b/src/core/locale_translations.h
index 9b17016d9..08ed29c1e 100644
--- a/src/core/locale_translations.h
+++ b/src/core/locale_translations.h
@@ -749,6 +749,7 @@ MAKE_TRANSLATION(wwHolidays, "holidays", "holiday dates", "Feiertage", "Feestdag
 MAKE_TRANSLATION(wwVacations, "vacations", "vacation dates", "Urlaubstage", "Vakantiedagen", "Semesterdatum Varmvatten", "dni urlopowe", "ferie dato varmtvann", "dates vacances", "izin günleri", "date vacanze", "termíny dovolenky", "data pro prázdniny")
 MAKE_TRANSLATION(holidays, "holidays", "holiday dates", "Feiertage", "Feestdagen", "Helgdatum", "święta", "helligdager", "dates vacances", "tatil günleri", "date feste pubbliche", "sviatočné termíny", "data pro dovolenou")
 MAKE_TRANSLATION(vacations, "vacations", "vacation dates", "Urlaubstage", "Vakantiedagen", "Semesterdatum", "urlop", "feriedager", "dates vacances", "izin günleri", "date vacanze", "termíny dovolenky", "data pro prázdniny")
+MAKE_TRANSLATION(vacationmode, "vacationmode", "vacation mode", "Urlaubsmodus", "", "", "", "", "", "", "", "", "") // ToDo Translate
 MAKE_TRANSLATION(wwprio, "dhwprio", "dhw priority", "WW-Vorrang", "Prioriteit warm water", "Prioritera Varmvatten", "priorytet dla c.w.u.", "prioroter varmtvann", "priorité ecs", "sıcak kullanım suyu önceliği", "priorita acqua calda", "Priorita TÚV", "přednost ohřevu TUV")
 MAKE_TRANSLATION(nofrostmode1, "nofrostmode1", "nofrost mode", "Frostschutz", "Vorstbeveiligingsmodus", "Frostskyddsläge", "ochrona przed zamarzaniem", "frostbeskyttelse", "mode protection gel", "donma koruması modu 1", "modalita protezione antigelo", "nofrost režim", "režim proti zamrznutí")
 MAKE_TRANSLATION(reducehours, "reducehours", "duration for nighttemp", "Dauer Nachttemp.", "Duur nachtverlaging", "Timmar Nattsänkning", "czas trwania trybu nocnego", "timer nattsenkning", "durée température nuit", "gece sıcaklığı süresi", "durata temperatura notturna", "trvanie nočnej teploty", "délka trvání noční teploty")
diff --git a/src/devices/thermostat.cpp b/src/devices/thermostat.cpp
index 8e74f3cdc..5953ff276 100644
--- a/src/devices/thermostat.cpp
+++ b/src/devices/thermostat.cpp
@@ -145,7 +145,7 @@ Thermostat::Thermostat(uint8_t device_type, uint8_t device_id, uint8_t product_i
 
     } else if (model == EMSdevice::EMS_DEVICE_FLAG_CR11) {
         monitor_typeids = {0x02A5};
-        set_typeids     = {0x2B9};
+        set_typeids     = {0x02B9};
         curve_typeids   = {0x029B};
         register_telegram_type(monitor_typeids[0], "RC300Monitor", true, MAKE_PF_CB(process_CR11Monitor));
         register_telegram_type(set_typeids[0], "RC300Set", false, MAKE_PF_CB(process_RC300Set));
@@ -188,7 +188,11 @@ Thermostat::Thermostat(uint8_t device_type, uint8_t device_id, uint8_t product_i
 
         register_telegram_type(0xBB, "HybridSettings", true, MAKE_PF_CB(process_HybridSettings));
         register_telegram_type(0x23E, "PVSettings", true, MAKE_PF_CB(process_PVSettings));
-        register_telegram_type(0x269, "RC300Holiday1", true, MAKE_PF_CB(process_RC300Holiday));
+        if (model == EMSdevice::EMS_DEVICE_FLAG_RC100) {
+            register_telegram_type(0x43F, "CRHolidays", true, MAKE_PF_CB(process_RC300Holiday));
+        } else {
+            register_telegram_type(0x269, "RC300Holiday", true, MAKE_PF_CB(process_RC300Holiday));
+        }
         register_telegram_type(0x16E, "Absent", true, MAKE_PF_CB(process_Absent));
 
         // JUNKERS/HT3
@@ -1114,6 +1118,7 @@ void Thermostat::process_RC300Monitor(std::shared_ptr<const Telegram> telegram)
     has_update(telegram, hc->curroominfl, 27);
     has_update(telegram, hc->currSolarInfl, 29);
     has_update(telegram, hc->coolingon, 32);
+    has_update(telegram, hc->vacationmode, 18);
 
     add_ha_climate(hc);
 }
@@ -1341,7 +1346,7 @@ void Thermostat::process_RC300Floordry(std::shared_ptr<const Telegram> telegram)
 }
 
 // 0x269 - 0x26D  RC300 EMS+ holidaymodes 1 to 5
-// special case R3000 only date in 0x269
+// special case R3000 only date in 0x269, CR50 only 0x043F
 void Thermostat::process_RC300Holiday(std::shared_ptr<const Telegram> telegram) {
     if (telegram->offset || telegram->message_length < 6) {
         return;
@@ -2694,7 +2699,7 @@ bool Thermostat::set_RC30Vacation(const char * value, const int8_t id) {
 }
 
 // set R3000 holiday as string dd.mm.yyyy-dd.mm.yyyy
-// RC30 and rego 3000
+// RC30 and rego 3000 and CR50
 bool Thermostat::set_R3000Holiday(const char * value, const int8_t id) {
     if (strlen(value) != 21) {
         return false;
@@ -2711,7 +2716,11 @@ bool Thermostat::set_R3000Holiday(const char * value, const int8_t id) {
     if (!data[2] || data[2] > 31 || !data[1] || data[1] > 12 || !data[5] || data[5] > 31 || !data[4] || data[4] > 12) {
         return false;
     }
-    write_command(0x269, 0, data, 6, 0x269);
+    if (model() == EMSdevice::EMS_DEVICE_FLAG_R3000) {
+        write_command(0x269, 0, data, 6, 0x269);
+    } else if (model() == EMSdevice::EMS_DEVICE_FLAG_RC100) {
+        write_command(0x43F, 0, data, 6, 0x269);
+    }
     return true;
 }
 
@@ -4201,7 +4210,7 @@ void Thermostat::register_device_values() {
                               MAKE_CF_CB(set_minexttemp));
         register_device_value(DeviceValueTAG::TAG_DEVICE_DATA, &ibaDamping_, DeviceValueType::BOOL, FL_(damping), DeviceValueUOM::NONE, MAKE_CF_CB(set_damping));
         register_device_value(DeviceValueTAG::TAG_DEVICE_DATA, &hasSolar_, DeviceValueType::BOOL, FL_(hasSolar), DeviceValueUOM::NONE, MAKE_CF_CB(set_solar));
-        if (model() == EMSdevice::EMS_DEVICE_FLAG_R3000) {
+        if (model() == EMSdevice::EMS_DEVICE_FLAG_R3000 || model() == EMSdevice::EMS_DEVICE_FLAG_RC100) {
             register_device_value(DeviceValueTAG::TAG_DEVICE_DATA,
                                   &vacation[0],
                                   DeviceValueType::STRING,
@@ -4638,6 +4647,7 @@ void Thermostat::register_device_values_hc(std::shared_ptr<Thermostat::HeatingCi
                               MAKE_CF_CB(set_summermode));
         register_device_value(tag, &hc->summermode, DeviceValueType::ENUM, FL_(enum_summer), FL_(summermode), DeviceValueUOM::NONE);
         register_device_value(tag, &hc->hpoperatingstate, DeviceValueType::ENUM, FL_(enum_operatingstate), FL_(hpoperatingstate), DeviceValueUOM::NONE);
+        register_device_value(tag, &hc->vacationmode, DeviceValueType::BOOL, FL_(vacationmode), DeviceValueUOM::NONE);
         if (model == EMSdevice::EMS_DEVICE_FLAG_RC100 || model == EMSdevice::EMS_DEVICE_FLAG_CR120) {
             register_device_value(
                 tag, &hc->controlmode, DeviceValueType::ENUM, FL_(enum_controlmode), FL_(controlmode), DeviceValueUOM::NONE, MAKE_CF_CB(set_controlmode));
diff --git a/src/devices/thermostat.h b/src/devices/thermostat.h
index 38142b6bd..cba27470a 100644
--- a/src/devices/thermostat.h
+++ b/src/devices/thermostat.h
@@ -77,6 +77,7 @@ class Thermostat : public EMSdevice {
         int8_t  reducetemp;
         int8_t  vacreducetemp;
         uint8_t vacreducemode;
+        uint8_t vacationmode;
         uint8_t wwprio;
         uint8_t fastHeatup;
         char    holiday[22];