diff --git a/src/ise_display_definitions.hpp b/src/ise_display_definitions.hpp
index b98e5c9..34785f8 100644
--- a/src/ise_display_definitions.hpp
+++ b/src/ise_display_definitions.hpp
@@ -67,9 +67,9 @@ lights have 4 states
 #define MOTION_REAR 9
 
 //PM fanspeed setting
-#define PM_FAN_SPEED_LOW 3
-#define PM_FAN_SPEED_MID 10
-#define PM_FAN_SPEED_HIGH 18
+#define PM_FAN_SPEED_LOW 1
+#define PM_FAN_SPEED_MID 5
+#define PM_FAN_SPEED_HIGH 9
 
 //
 #define DISPLAY_TIMEOUT 5*60*1000 // 5 minutes