diff --git a/CHANGELOG_LATEST.md b/CHANGELOG_LATEST.md
index 025954be5..a5e60640f 100644
--- a/CHANGELOG_LATEST.md
+++ b/CHANGELOG_LATEST.md
@@ -3,7 +3,7 @@
 ### Added
 - function keys in editor: cursor, del, home, end. F1=help, F2=show, and other shortcuts
 - SM100 pump working time and energy units
-- heating curve parameters for RC300
+- heating curve parameters for RC300 (fixed)
 - `wwonetime` for RC300 thermostat
 
 ### Fixed
diff --git a/src/devices/thermostat.cpp b/src/devices/thermostat.cpp
index fd19f6acb..17c1c1ab9 100644
--- a/src/devices/thermostat.cpp
+++ b/src/devices/thermostat.cpp
@@ -773,6 +773,16 @@ std::shared_ptr<Thermostat::HeatingCircuit> Thermostat::heating_circuit(std::sha
         }
     }
 
+    // not found, search heating_curve message types
+    if (hc_num == 0) {
+        for (uint8_t i = 0; i < curve_typeids.size(); i++) {
+            if (curve_typeids[i] == telegram->type_id) {
+                hc_num = i + 1;
+                break;
+            }
+        }
+    }
+
     // not found, search timer message types
     if (hc_num == 0) {
         for (uint8_t i = 0; i < timer_typeids.size(); i++) {