diff --git a/CHANGELOG_LATEST.md b/CHANGELOG_LATEST.md
index e0405527a..343aca6e7 100644
--- a/CHANGELOG_LATEST.md
+++ b/CHANGELOG_LATEST.md
@@ -34,3 +34,4 @@ For more details go to [emsesp.org](https://emsesp.org/).
 - fetch telegrams: set length to fetch [#3017](https://github.com/emsesp/EMS-ESP32/issues/3017)
 - move http client from stack to heap
 - heap optimizations [#3021](https://github.com/emsesp/EMS-ESP32/discussions/3021)
+- check and read 0x470 as summer2_typeids[0] only if received [#2686](https://github.com/emsesp/EMS-ESP32/issues/2686), [#3055](https://github.com/emsesp/EMS-ESP32/issues/3055)
diff --git a/docs/dump_telegrams.csv b/docs/dump_telegrams.csv
index f9b84239e..4a5053260 100644
--- a/docs/dump_telegrams.csv
+++ b/docs/dump_telegrams.csv
@@ -112,10 +112,10 @@ telegram_type_id,name,is_fetched
 0x02A0,RC300Curves, 
 0x02A1,RC300Curves, 
 0x02A2,RC300Curves, 
-0x02A5,RC300Monitor,fetched
-0x02A6,CRFMonitor, 
+0x02A5,RC300Monitor, 
+0x02A6,RC300Monitor, 
 0x02A7,RC300Monitor, 
-0x02A8,CRFMonitor, 
+0x02A8,RC300Monitor, 
 0x02A9,RC300Monitor, 
 0x02AA,RC300Monitor, 
 0x02AB,RC300Monitor, 
@@ -171,7 +171,7 @@ telegram_type_id,name,is_fetched
 0x0468,HPSet, 
 0x0469,HPSet, 
 0x046A,HPSet, 
-0x0470,RC300Summer2, 
+0x0470,RC300Summer2,fetched
 0x0471,RC300Summer2, 
 0x0472,RC300Summer2, 
 0x0473,RC300Summer2, 
@@ -179,6 +179,7 @@ telegram_type_id,name,is_fetched
 0x0475,RC300Summer2, 
 0x0476,RC300Summer2, 
 0x0477,RC300Summer2, 
+0x0478,RC300Summer2, 
 0x047B,HP2, 
 0x0484,HPSilentMode,fetched
 0x0485,HpCooling,fetched
diff --git a/src/devices/thermostat.cpp b/src/devices/thermostat.cpp
index ceba2fc86..824897496 100644
--- a/src/devices/thermostat.cpp
+++ b/src/devices/thermostat.cpp
@@ -166,7 +166,7 @@ Thermostat::Thermostat(uint8_t device_type, uint8_t device_id, uint8_t product_i
         set2_typeids              = {0x0421, 0x0422, 0x0423, 0x0424};
         summer_typeids            = {0x02AF, 0x02B0, 0x02B1, 0x02B2, 0x02B3, 0x02B4, 0x02B5, 0x02B6};
         curve_typeids             = {0x029B, 0x029C, 0x029D, 0x029E, 0x029F, 0x02A0, 0x02A1, 0x02A2};
-        summer2_typeids           = {0x0470, 0x0471, 0x0472, 0x0473, 0x0474, 0x0475, 0x0476, 0x0477, 0x0478};
+        summer2_typeids           = {0x0471, 0x0472, 0x0473, 0x0474, 0x0475, 0x0476, 0x0477, 0x0478};
         hp_typeids                = {0x0467, 0x0468, 0x0469, 0x046A};
         hpmode_typeids            = {0x0291, 0x0292, 0x0293, 0x0294};
         const size_t monitor_size = monitor_typeids.size();
@@ -207,6 +207,7 @@ Thermostat::Thermostat(uint8_t device_type, uint8_t device_id, uint8_t product_i
         register_telegram_type(0x16E, "Absent", true, MAKE_PF_CB(process_Absent), 1);
         register_telegram_type(0xBF, "ErrorMessage", false, MAKE_PF_CB(process_ErrorMessageBF));
         register_telegram_type(0xC0, "RCErrorMessage", false, MAKE_PF_CB(process_RCErrorMessage2));
+        register_telegram_type(0x470, "RC300Summer2", true, MAKE_PF_CB(process_RC300Summer2), 8);
         EMSESP::send_read_request(0xC0, device_id, 0, 20); // read last errorcode on start (only published on errors)
 
         // JUNKERS/HT3
@@ -1268,7 +1269,13 @@ void Thermostat::process_RC300Summer(std::shared_ptr<const Telegram> telegram) {
 void Thermostat::process_RC300Summer2(std::shared_ptr<const Telegram> telegram) {
     auto hc = heating_circuit(telegram);
     if (hc == nullptr) {
-        return;
+        // telegram 0x470 see https://github.com/emsesp/EMS-ESP32/issues/2686
+        if (telegram->type_id == 0x470 && telegram->message_length > 2) {
+            hc                 = heating_circuit(1);
+            summer2_typeids[0] = 0x470;
+        } else {
+            return;
+        }
     }
     if (hc->statusbyte & 1) {
         has_update(telegram, hc->summersetmode, 0);
diff --git a/src/emsesp_version.h b/src/emsesp_version.h
index c98cd567e..e7b3ea13f 100644
--- a/src/emsesp_version.h
+++ b/src/emsesp_version.h
@@ -1 +1 @@
-#define EMSESP_APP_VERSION "3.8.2-dev.19"
+#define EMSESP_APP_VERSION "3.8.2-dev.20"