Обновление статуса переехало в отдельный класс, в реакции на сообщение только известный набор статусов возвращаем

Problems/Item.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ZaoBot.Problems
+{
+	public enum Status
+	{
+		UNKNOWN,
+		OK,
+		PROBLEM
+	}
+
+	class Item
+	{
+		public string label;
+		public string name;
+		public Status status;
+	}
+}

Problems/StatusManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Timers;
+
+namespace ZaoBot.Problems
+{
+	class StatusManager
+	{
+		const int DEFAULT_INTERVAL = 2000;
+
+		private OpenHab.OpenHabClient openhab;
+
+		private Timer timer;
+		private Dictionary<string, Item> statusItems = new Dictionary<string, Item>();
+
+		public IEnumerable<Item> StatusItems => statusItems.Values;
+
+		public StatusManager(OpenHab.OpenHabClient openhab)
+		{
+			this.openhab = openhab;
+			UpdateStatus();
+			timer = new Timer(DEFAULT_INTERVAL);
+			timer.Elapsed += OnTimer;
+			timer.Enabled = true;
+		}
+
+		private void OnTimer(object sender, ElapsedEventArgs e)
+		{
+			UpdateStatus();
+		}
+
+		private async void UpdateStatus()
+		{
+			try
+			{
+				var items = await openhab.GetItems();
+				foreach (var item in items)
+				{
+					if (!item.name.StartsWith("Problem_")) continue;
+					Item statusItem = null;
+					if (statusItems.ContainsKey(item.name)) statusItem = statusItems[item.name];
+					else
+					{
+						statusItem = new Item()
+						{
+							name = item.name,
+							label = item.label,
+							status = Status.UNKNOWN
+						};
+						statusItems[item.name] = statusItem;
+					}
+					var state = await openhab.GetItemState(item.name);
+					if (state.state == "OFF") statusItem.status = Status.OK;
+					else if (state.state == "ON") statusItem.status = Status.PROBLEM;
+					else statusItem.status = Status.UNKNOWN;
+				}
+
+			}
+			catch (Exception ex)
+			{
+				Console.WriteLine("Exception on getting status: " + ex.ToString());
+			}
+		}
+	}
+}