diff --git a/zonewatcher/constants.go b/zonewatcher/constants.go
new file mode 100644
index 0000000..9a0c002
--- /dev/null
+++ b/zonewatcher/constants.go
@@ -0,0 +1,19 @@
+package zonewatcher
+
+const REG_PER_ZONE = 4
+const REG_ENABLED = 1
+const REG_MODE = 2
+const REG_TARGET_TEMP = 3
+const REG_CURRENT_TEMP = 4
+
+const FAN_OFF = 0x00
+const FAN_LOW = 0x10
+const FAN_MED = 0x20
+const FAN_HIGH = 0x30
+const FAN_AUTO = 0x40
+
+const MODE_AIR_COOLING = 0x01
+const MODE_AIR_HEATING = 0x02
+const MODE_UNDERFLOOR_HEATING = 0x04
+const MODE_UNDERFLOOR_AIR_COOLING = 0x05
+const MODE_UNDERFLOOR_AIR_HEATING = 0x06
diff --git a/zonewatcher/zonewatcher.go b/zonewatcher/zonewatcher.go
index 552ce67..36536d4 100644
--- a/zonewatcher/zonewatcher.go
+++ b/zonewatcher/zonewatcher.go
@@ -5,12 +5,6 @@ import (
 	"log"
 )
 
-const REG_PER_ZONE = 4
-const REG_ENABLED = 1
-const REG_MODE = 2
-const REG_TARGET_TEMP = 3
-const REG_CURRENT_TEMP = 4
-
 type Watcher interface {
 	ReadRegister(address uint16) (value []byte, err error)
 	RegisterCallback(address uint16, callback func(address uint16))