diff --git a/xiaomi/devices/air_conditioner.go b/xiaomi/devices/air_conditioner.go
index b4b1cb7..d12bf0e 100644
--- a/xiaomi/devices/air_conditioner.go
+++ b/xiaomi/devices/air_conditioner.go
@@ -2,6 +2,7 @@ package devices
 
 import (
 	"context"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -17,6 +18,10 @@ type valMapper struct {
 	val2name map[int]string
 	name2val map[string]int
 	names    []string
+
+	// levelFallback 允许 low/medium/high 映射到数字档位（仅 fan-level 启用，
+	// 用于枚举为 Level1~LevelN 的设备；mode/swing 枚举语义固定，禁用）。
+	levelFallback bool
 }
 
 func newValMapper(vl miot.MIoTSpecValueList) *valMapper {
@@ -38,15 +43,82 @@ func newValMapper(vl miot.MIoTSpecValueList) *valMapper {
 	return vm
 }
 
+// newValMapperLevel 创建支持 low/medium/high → LevelN 映射的 valMapper（仅 fan-level 使用）。
+func newValMapperLevel(vl miot.MIoTSpecValueList) *valMapper {
+	vm := newValMapper(vl)
+	vm.levelFallback = true
+	return vm
+}
+
 func (vm *valMapper) name(v int) string {
-	if vm == nil { return "" }
-	return vm.val2name[v]
+	if vm == nil {
+		return ""
+	}
+	if s, ok := vm.val2name[v]; ok {
+		if !vm.levelFallback {
+			return s
+		}
+		// levelFallback：数字档位反向映射到语义枚举（与 val() 正向对称）。
+		// 0→auto，最低档→low，中间档→medium，最高档→high；其余返回 spec 描述。
+		levels := vm.levelValues()
+		switch {
+		case v == 0:
+			return "auto"
+		case len(levels) > 0 && v == levels[0]:
+			return "low"
+		case len(levels) > 1 && v == levels[len(levels)-1]:
+			return "high"
+		case len(levels) > 2 && v == levels[len(levels)/2]:
+			return "medium"
+		}
+		return s
+	}
+	return ""
 }
 
 func (vm *valMapper) val(name string) (int, bool) {
-	if vm == nil { return 0, false }
-	v, ok := vm.name2val[strings.ToLower(name)]
-	return v, ok
+	if vm == nil {
+		return 0, false
+	}
+	key := strings.ToLower(name)
+	if v, ok := vm.name2val[key]; ok {
+		return v, true
+	}
+	// fallback：标准档位枚举（low/medium/high）映射到数字档位的相对位置。
+	// 适用于 fan-level 枚举为 Level1~LevelN（或纯数字）的设备，如 klwdz1.airc.001。
+	// 排除 0（通常为 Auto/Off），low→最低档，medium→中间档，high→最高档。
+	// 仅 levelFallback 启用（fan-level）时生效，mode/swing 不受影响。
+	if !vm.levelFallback {
+		return 0, false
+	}
+	levels := vm.levelValues()
+	if len(levels) == 0 {
+		return 0, false
+	}
+	switch key {
+	case "low":
+		return levels[0], true
+	case "high":
+		return levels[len(levels)-1], true
+	case "medium":
+		return levels[len(levels)/2], true
+	}
+	return 0, false
+}
+
+// levelValues 返回非 0 档位的升序值列表（levelFallback 辅助）。
+func (vm *valMapper) levelValues() []int {
+	var levels []int
+	for v := range vm.val2name {
+		if v != 0 {
+			levels = append(levels, v)
+		}
+	}
+	if len(levels) == 0 {
+		return nil
+	}
+	sort.Ints(levels)
+	return levels
 }
 
 func (vm *valMapper) allNames() []string {
@@ -282,14 +354,14 @@ func NewAirConditioner(client *xiaomi.Client, info *xiaomi.DeviceInfo) (AirCondi
 	if resolver.hasService("thermostat") {
 		if s, p, ok := resolver.findInService("thermostat", "fan-level"); ok {
 			d.propFanSpeed = siidPiid{s, p, true}
-			d.fanMap = newValMapper(findValListInService("thermostat", "fan-level"))
+			d.fanMap = newValMapperLevel(findValListInService("thermostat", "fan-level"))
 		} else if s, p, ok := resolver.find("fan-level"); ok {
 			d.propFanSpeed = siidPiid{s, p, true}
-			d.fanMap = newValMapper(findValList("fan-level"))
+			d.fanMap = newValMapperLevel(findValList("fan-level"))
 		}
 	} else if s, p, ok := resolver.find("fan-level"); ok {
 		d.propFanSpeed = siidPiid{s, p, true}
-		d.fanMap = newValMapper(findValList("fan-level"))
+		d.fanMap = newValMapperLevel(findValList("fan-level"))
 	}
 	// Try multiple swing mode type names
 	if s, p, ok := resolver.find("swing-mode"); ok {
diff --git a/xiaomi/devices/devices_test.go b/xiaomi/devices/devices_test.go
index c406fa3..61637f6 100644
--- a/xiaomi/devices/devices_test.go
+++ b/xiaomi/devices/devices_test.go
@@ -3,6 +3,7 @@ package devices
 import (
 	"testing"
 
+	"xiaomihome/miot"
 	"xiaomihome/xiaomi"
 )
 
@@ -200,3 +201,43 @@ func TestServiceShortName(t *testing.T) {
 		}
 	}
 }
+
+func TestValMapperLevelFallback(t *testing.T) {
+	// klwdz1.airc.001 场景：Auto + Level1~Level5
+	vl := miot.MIoTSpecValueList{
+		{Value: 0, Desc: "Auto"}, {Value: 1, Desc: "Level1"}, {Value: 2, Desc: "Level2"},
+		{Value: 3, Desc: "Level3"}, {Value: 4, Desc: "Level4"}, {Value: 5, Desc: "Level5"},
+	}
+	vm := newValMapperLevel(vl)
+	cases := []struct{ name string; want int; ok bool }{
+		{"auto", 0, true}, {"Auto", 0, true},
+		{"low", 1, true}, {"medium", 3, true}, {"high", 5, true},
+		{"level3", 3, true},
+	}
+	for _, c := range cases {
+		got, ok := vm.val(c.name)
+		if ok != c.ok || (ok && got != c.want) {
+			t.Errorf("val(%q) = (%d,%v), want (%d,%v)", c.name, got, ok, c.want, c.ok)
+		}
+	}
+	// 反向解析（MQTT 上报值 → 语义枚举），与 val() 正向对称
+	rname := []struct{ v int; want string }{
+		{0, "auto"}, {1, "low"}, {3, "medium"}, {5, "high"}, {2, "Level2"},
+	}
+	for _, c := range rname {
+		if got := vm.name(c.v); got != c.want {
+			t.Errorf("name(%d) = %q, want %q", c.v, got, c.want)
+		}
+	}
+	// mode 枚举不受影响（无 low/medium/high fallback 副作用）
+	mvl := miot.MIoTSpecValueList{
+		{Value: 0, Desc: "Auto"}, {Value: 1, Desc: "Cool"}, {Value: 2, Desc: "Heat"},
+	}
+	mvm := newValMapper(mvl)
+	if _, ok := mvm.val("low"); ok {
+		t.Error("mode mapper should not resolve 'low'")
+	}
+	if v, ok := mvm.val("cool"); !ok || v != 1 {
+		t.Errorf("mode val(cool) = (%d,%v), want (1,true)", v, ok)
+	}
+}