diff --git a/messages/en.json b/messages/en.json
index 17920c11..2054ca95 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -749,6 +749,9 @@
 	"devices_device_type_placeholder": "Select a device type...",
 	"devices_device_type_required": "Device type id is required.",
 	"devices_download_pdf": "Download PDF",
+	"devices_error_status_body": "This sensor has reported an error and may need to be replaced. Please contact support so we can help get it back online.",
+	"devices_error_status_detail": "Reported status: {status}",
+	"devices_error_status_title": "Sensor error detected",
 	"devices_export_dialog_title": "Export Telemetry Data",
 	"devices_export_failed": "Unable to export telemetry for the selected range.",
 	"devices_export_no_data": "No telemetry was found for the selected date range.",
diff --git a/messages/ja.json b/messages/ja.json
index 5708fc87..dbcc6c2b 100644
--- a/messages/ja.json
+++ b/messages/ja.json
@@ -764,6 +764,9 @@
 	"devices_device_type_placeholder": "デバイスタイプを選択してください...",
 	"devices_device_type_required": "デバイスタイプ ID は必須です。",
 	"devices_download_pdf": "PDF をダウンロード",
+	"devices_error_status_body": "このセンサーはエラーを報告しており、交換が必要な可能性があります。オンラインに復旧できるよう、サポートまでお問い合わせください。",
+	"devices_error_status_detail": "報告されたステータス: {status}",
+	"devices_error_status_title": "センサーエラーが検出されました",
 	"devices_export_dialog_title": "テレメトリデータをエクスポート",
 	"devices_export_failed": "選択した範囲のテレメトリをエクスポートできませんでした。",
 	"devices_export_no_data": "選択した日付範囲にテレメトリが見つかりませんでした。",
diff --git a/src/lib/interfaces/CwDevice.interface.ts b/src/lib/interfaces/CwDevice.interface.ts
index 9c20c379..94423c51 100644
--- a/src/lib/interfaces/CwDevice.interface.ts
+++ b/src/lib/interfaces/CwDevice.interface.ts
@@ -20,6 +20,7 @@ export interface CwDevice {
 	primary_data?: string | null;
 	secondary_data?: string | null;
 	group?: string | null;
+	error_status?: string | null;
 	created_at?: string | null;
 	location_name?: string;
 	has_primary_data?: boolean;
diff --git a/src/routes/locations/[location_id]/devices/[dev_eui]/+page.svelte b/src/routes/locations/[location_id]/devices/[dev_eui]/+page.svelte
index a53e735d..7077f5bf 100644
--- a/src/routes/locations/[location_id]/devices/[dev_eui]/+page.svelte
+++ b/src/routes/locations/[location_id]/devices/[dev_eui]/+page.svelte
@@ -11,7 +11,13 @@
 	} from '$lib/devices/relay-control';
 	import { type RelayNumber, type RelayTargetState } from '$lib/devices/relay-types';
 	import { m } from '$lib/paraglide/messages.js';
-	import { CwCard, CwResponsiveLineChart, useCwToast } from '@cropwatchdevelopment/cwui';
+	import {
+		CwButton,
+		CwCard,
+		CwDialog,
+		CwResponsiveLineChart,
+		useCwToast
+	} from '@cropwatchdevelopment/cwui';
 	import { cwResponsiveLineChartLabels } from '$lib/i18n/cwuiLabels';
 	import { appTheme } from '$lib/theme/appTheme.svelte';
 	import { resolveExportTimeZone } from './csvExport';
@@ -137,6 +143,24 @@
 			displayHistoricalData.length === 0
 	);
 
+	// A non-empty `error_status` on the device row means the sensor has reported a
+	// fault and likely needs replacing. Surface it in an auto-opening dialog.
+	let deviceErrorStatus = $derived(
+		typeof data.device?.error_status === 'string' ? data.device.error_status.trim() : ''
+	);
+	let errorDialogOpen = $state(false);
+	let errorDialogRouteKey = '';
+
+	// Auto-open the error dialog whenever we land on a device that has an error
+	// status set. Keyed on `routeKey` so it re-opens when navigating between
+	// devices, but stays closed once the user dismisses it for the current one.
+	$effect(() => {
+		if (deviceErrorStatus && errorDialogRouteKey !== routeKey) {
+			errorDialogRouteKey = routeKey;
+			errorDialogOpen = true;
+		}
+	});
+
 	afterNavigate(() => {
 		const key = routeKey;
 		if (isRelayDevice && authToken) {
@@ -398,6 +422,20 @@
 </svelte:head>
 
 <AppPage>
+	{#if deviceErrorStatus}
+		<CwDialog bind:open={errorDialogOpen} title={m.devices_error_status_title()}>
+			<p class="device-page__error-body">{m.devices_error_status_body()}</p>
+			<p class="device-page__error-detail">
+				{m.devices_error_status_detail({ status: deviceErrorStatus })}
+			</p>
+			{#snippet actions()}
+				<CwButton variant="primary" onclick={() => (errorDialogOpen = false)}>
+					{m.action_close()}
+				</CwButton>
+			{/snippet}
+		</CwDialog>
+	{/if}
+
 	<div class="device-page">
 		<DeviceDashboardHeader
 			{activeRange}
@@ -475,6 +513,17 @@
 		color: var(--cw-text-muted, #475467);
 	}
 
+	.device-page__error-body {
+		margin: 0;
+		color: var(--cw-text-primary, #101828);
+	}
+
+	.device-page__error-detail {
+		margin: 0.75rem 0 0;
+		font-size: var(--cw-text-sm, 0.875rem);
+		color: var(--cw-text-muted, #475467);
+	}
+
 	@media (max-width: 720px) {
 		.device-page {
 			padding-right: 0;