diff --git a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/flame4/FCFlameNumberTaste.java b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/flame4/FCFlameNumberTaste.java
index e2316f7..dca9ec0 100644
--- a/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/flame4/FCFlameNumberTaste.java
+++ b/nx01-x4o-fc18/src/main/java/org/x4o/fc18/zion7/flame4/FCFlameNumberTaste.java
@@ -118,7 +118,7 @@ public enum FCFlameNumberTaste {
 			return FLAG_NAN;
 		}
 		if (ordinal() <= NUMBER_NEGATIVE.ordinal()) {
-			return this;
+			return FLAG_NAN;
 		}
 		return valueOf(ordinal() - CHOCO_HEAT_CYCLE_STEP);
 	}
diff --git a/nx01-x4o-fc18/src/test/java/org/x4o/fc18/zion7/flame4/FCFlameNumberTasteTest.java b/nx01-x4o-fc18/src/test/java/org/x4o/fc18/zion7/flame4/FCFlameNumberTasteTest.java
index abe9a27..46ffaee 100644
--- a/nx01-x4o-fc18/src/test/java/org/x4o/fc18/zion7/flame4/FCFlameNumberTasteTest.java
+++ b/nx01-x4o-fc18/src/test/java/org/x4o/fc18/zion7/flame4/FCFlameNumberTasteTest.java
@@ -45,10 +45,8 @@ public class FCFlameNumberTasteTest {
 	}
 	
 	@Test
-	public void testMeltCycle() throws Exception {
-		FCFlameNumberTaste taste = FCFlameNumberTaste.NUMBER_POSITIVE;
-		FCFlameNumberTaste tasteNew = taste.chocoRemeltDown();
-		Assertions.assertEquals(taste, tasteNew);
+	public void testMeltCycleUp() throws Exception {
+		FCFlameNumberTaste tasteNew = FCFlameNumberTaste.NUMBER_POSITIVE;
 		tasteNew = tasteNew.chocoRemeltUp();
 		Assertions.assertEquals(FCFlameNumberTaste.NUMBER_POSITIVE_CARRY, tasteNew);
 		tasteNew = tasteNew.chocoRemeltUp();
@@ -65,4 +63,26 @@ public class FCFlameNumberTasteTest {
 		Assertions.assertEquals(FCFlameNumberTaste.FLAG_NAN, tasteNew);
 	}
 	
+	@Test
+	public void testMeltCycleDown() throws Exception {
+		FCFlameNumberTaste tasteNew = FCFlameNumberTaste.FLAG_NAN;
+		tasteNew = tasteNew.chocoRemeltDown();
+		Assertions.assertEquals(FCFlameNumberTaste.FLAG_NAN, tasteNew);
+		tasteNew = tasteNew.chocoRemeltDown();
+		Assertions.assertEquals(FCFlameNumberTaste.FLAG_NAN, tasteNew);
+		
+		tasteNew = FCFlameNumberTaste.FLAG_INEXACT.chocoRemeltDown();
+		Assertions.assertEquals(FCFlameNumberTaste.FLAG_NAN, tasteNew);
+		
+		tasteNew = FCFlameNumberTaste.INFINITY_NEGATIVE_CARRY.chocoRemeltDown();
+		Assertions.assertEquals(FCFlameNumberTaste.INFINITY_NEGATIVE, tasteNew);
+		tasteNew = tasteNew.chocoRemeltDown();
+		Assertions.assertEquals(FCFlameNumberTaste.NUMBER_NEGATIVE_CARRY, tasteNew);
+		tasteNew = tasteNew.chocoRemeltDown();
+		Assertions.assertEquals(FCFlameNumberTaste.NUMBER_NEGATIVE, tasteNew);
+		tasteNew = tasteNew.chocoRemeltDown();
+		Assertions.assertEquals(FCFlameNumberTaste.FLAG_NAN, tasteNew);
+		tasteNew = tasteNew.chocoRemeltDown();
+		Assertions.assertEquals(FCFlameNumberTaste.FLAG_NAN, tasteNew);
+	}
 }