diff --git a/.github/workflows/run-unit-tests.yml b/.github/workflows/run-unit-tests.yml
index bb360e8aa..789f15381 100644
--- a/.github/workflows/run-unit-tests.yml
+++ b/.github/workflows/run-unit-tests.yml
@@ -783,6 +783,7 @@ jobs:
           python3 -B test/test_rtttl_rollover.py -v
           python3 -B test/test_rtttl_rollover_recipes.py -v
           python3 -B test/test_companion_ui_deadlines.py -v
+          python3 -B test/test_home_sensor_refresh.py -v
           python3 -B test/test_scrolling_status_bar_rollover.py -v
           python3 -B test/test_gps_voice_buttons.py -v
           python3 -B test/test_gps_voice_generator.py -v
diff --git a/examples/companion_radio/ui-new/UITask.cpp b/examples/companion_radio/ui-new/UITask.cpp
index 835b6827d..6ea322322 100644
--- a/examples/companion_radio/ui-new/UITask.cpp
+++ b/examples/companion_radio/ui-new/UITask.cpp
@@ -576,7 +576,7 @@ class HomeScreen : public UIScreen {
   int sensors_nb = 0;
   bool sensors_scroll = false;
   int sensors_scroll_offset = 0;
-  int next_sensors_refresh = 0;
+  uint32_t last_sensors_refresh = 0;
 
   void refresh_sensors() {
     // CayenneLPP retains its requested capacity even if its allocation fails.
@@ -587,7 +587,15 @@ class HomeScreen : public UIScreen {
       sensors_scroll_offset = 0;
       return;
     }
-    if (millis() > next_sensors_refresh) {
+#if AUTO_OFF_MILLIS > 0
+    const uint32_t refresh_interval = 5000;
+#else
+    const uint32_t refresh_interval = 60000;
+#endif
+    // Empty data requests an initial/forced sample. Elapsed time also handles
+    // returning to this page after more than half a millis() cycle.
+    if (sensors_lpp.getSize() == 0
+        || static_cast<uint32_t>(millis() - last_sensors_refresh) >= refresh_interval) {
       sensors_lpp.reset();
       sensors_nb = 0;
       sensors_lpp.addVoltage(TELEM_CHANNEL_SELF, (float)board.getBattMilliVolts() / 1000.0f);
@@ -599,11 +607,7 @@ class HomeScreen : public UIScreen {
         sensors_nb ++;
       }
       sensors_scroll = sensors_nb > UI_RECENT_LIST_SIZE;
-#if AUTO_OFF_MILLIS > 0
-      next_sensors_refresh = millis() + 5000; // refresh sensor values every 5 sec
-#else
-      next_sensors_refresh = millis() + 60000; // refresh sensor values every 1 min
-#endif
+      last_sensors_refresh = millis();
     }
   }
 
@@ -1420,7 +1424,7 @@ public:
 #if UI_SENSORS_PAGE == 1
     if (key == KEY_ENTER && _page == HomePage::SENSORS) {
       _task->toggleGPS();
-      next_sensors_refresh=0;
+      sensors_lpp.reset();
       return true;
     }
 #endif
diff --git a/examples/companion_radio/ui-tiny/UITask.cpp b/examples/companion_radio/ui-tiny/UITask.cpp
index a67293c58..abb5b0fb1 100644
--- a/examples/companion_radio/ui-tiny/UITask.cpp
+++ b/examples/companion_radio/ui-tiny/UITask.cpp
@@ -168,13 +168,21 @@ class HomeScreen : public UIScreen {
   int sensors_nb = 0;
   bool sensors_scroll = false;
   int sensors_scroll_offset = 0;
-  int next_sensors_refresh = 0;
+  uint32_t last_sensors_refresh = 0;
   uint32_t _radio_profile_page_started_at = 0;
   uint8_t _radio_status_page = 0;
   bool _dual_radio_enabled_seen = false;
 
   void refresh_sensors() {
-    if (millis() > next_sensors_refresh) {
+#if AUTO_OFF_MILLIS > 0
+    const uint32_t refresh_interval = 5000;
+#else
+    const uint32_t refresh_interval = 60000;
+#endif
+    // Empty data requests an initial/forced sample. Elapsed time also handles
+    // returning to this page after more than half a millis() cycle.
+    if (sensors_lpp.getSize() == 0
+        || static_cast<uint32_t>(millis() - last_sensors_refresh) >= refresh_interval) {
       sensors_lpp.reset();
       sensors_nb = 0;
       sensors_lpp.addVoltage(TELEM_CHANNEL_SELF, (float)board.getBattMilliVolts() / 1000.0f);
@@ -186,11 +194,7 @@ class HomeScreen : public UIScreen {
         sensors_nb ++;
       }
       sensors_scroll = sensors_nb > UI_RECENT_LIST_SIZE;
-#if AUTO_OFF_MILLIS > 0
-      next_sensors_refresh = millis() + 5000; // refresh sensor values every 5 sec
-#else
-      next_sensors_refresh = millis() + 60000; // refresh sensor values every 1 min
-#endif
+      last_sensors_refresh = millis();
     }
   }
 
@@ -575,7 +579,7 @@ public:
 #if UI_SENSORS_PAGE == 1
     if (c == KEY_ENTER && _page == HomePage::SENSORS) {
       _task->toggleGPS();
-      next_sensors_refresh=0;
+      sensors_lpp.reset();
       return true;
     }
 #endif
diff --git a/test/fixtures/home_sensor_refresh.cpp b/test/fixtures/home_sensor_refresh.cpp
new file mode 100644
index 000000000..74b4bdbd2
--- /dev/null
+++ b/test/fixtures/home_sensor_refresh.cpp
@@ -0,0 +1,288 @@
+// The Home fields, refresh method, and input block come from production.
+// Only clock, board, sensor/LPP transport, and task boundaries are mocked.
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+#define TELEM_CHANNEL_SELF 0
+#define UI_RECENT_LIST_SIZE 3
+#define KEY_ENTER '\r'
+
+static uint32_t clock_ms = 0;
+uint32_t millis() { return clock_ms; }
+
+static const char* active_case = "initialization";
+static unsigned checks = 0;
+static unsigned scenarios = 0;
+#define CHECK(condition) do { \
+  ++checks; \
+  if (!(condition)) { \
+    std::fprintf(stderr, "FAIL %s: %s (line %d)\n", active_case, #condition, __LINE__); \
+    std::exit(1); \
+  } \
+} while (0)
+
+struct CayenneLPP {
+  uint8_t bytes[200] = {};
+  uint8_t size = 0;
+  bool allocated = true;
+  unsigned writes = 0;
+  uint8_t* getBuffer() { return allocated ? bytes : nullptr; }
+  uint8_t getSize() { return size; }
+  void reset() { size = 0; }
+  void addVoltage(int channel, float voltage) {
+    CHECK(getBuffer() != nullptr);
+    CHECK(channel == TELEM_CHANNEL_SELF && voltage == 4.0f);
+    ++writes;
+    bytes[size++] = 4;
+    size += 3;
+  }
+  void addSample() {
+    CHECK(getBuffer() != nullptr && size < sizeof(bytes) - 4);
+    ++writes;
+    bytes[size++] = 4;
+    size += 3;
+  }
+};
+
+struct LPPReader {
+  unsigned remaining;
+  LPPReader(uint8_t* buffer, uint8_t size) : remaining(buffer ? size / 4 : 0) {}
+  bool readHeader(uint8_t& channel, uint8_t& type) {
+    if (!remaining) return false;
+    --remaining;
+    channel = 0;
+    type = 1;
+    return true;
+  }
+  void skipData(uint8_t) {}
+};
+
+struct Board {
+  unsigned reads = 0;
+  int getBattMilliVolts() { ++reads; return 4000; }
+} board;
+
+struct Sensors {
+  unsigned calls = 0;
+  unsigned samples = 0;
+  uint32_t duration_ms = 0;
+  void querySensors(int mask, CayenneLPP& lpp) {
+    CHECK(mask == 0xFF);
+    ++calls;
+    for (unsigned i = 0; i < samples; ++i) lpp.addSample();
+    clock_ms += duration_ms;
+  }
+} sensors;
+
+struct Task {
+  unsigned toggles = 0;
+  void toggleGPS() { ++toggles; }
+};
+
+enum class HomePage { OTHER, SENSORS };
+
+struct Home {
+  @FIELDS@
+  Task task;
+  Task* _task = &task;
+  HomePage _page = HomePage::SENSORS;
+
+  @REFRESH@
+
+  bool input(char @KEY@) {
+    @INPUT@
+    return false;
+  }
+};
+
+static constexpr uint32_t interval_ms = AUTO_OFF_MILLIS > 0 ? 5000u : 60000u;
+
+static void begin_case(const char* name, uint32_t initial_ms) {
+  active_case = name;
+  ++scenarios;
+  clock_ms = initial_ms;
+  sensors = Sensors{};
+  board = Board{};
+}
+
+static void initial_at(uint32_t at) {
+  begin_case("fresh page", at);
+  Home home;
+  CHECK(home.sensors_lpp.getSize() == 0);
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1 && board.reads == 1);
+  CHECK(home.sensors_lpp.getSize() == 4);
+  CHECK(home.sensors_nb == 1 && !home.sensors_scroll);
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1 && board.reads == 1);
+}
+
+static void cadence_and_records() {
+  begin_case("normal cadence and records", 100);
+  Home home;
+  sensors.samples = 4;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1 && home.sensors_nb == 5 && home.sensors_scroll);
+  clock_ms += interval_ms - 1;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  ++clock_ms;
+  sensors.samples = 0;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2 && home.sensors_nb == 1 && !home.sensors_scroll);
+  CHECK(home.sensors_lpp.getSize() == 4);
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+}
+
+static void wrap_visible() {
+  begin_case("visible across wrap", UINT32_MAX - interval_ms / 2);
+  Home home;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  ++clock_ms;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  clock_ms += interval_ms - 2;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  ++clock_ms;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+}
+
+static void wake_across_wrap() {
+  begin_case("wake across wrap", UINT32_MAX - 2 * interval_ms);
+  Home home;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  // The display is not rendered while asleep; wake after millis wraps.
+  clock_ms = 1000;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+}
+
+static void exact_wrap_deadline() {
+  begin_case("deadline at zero", uint32_t(0u - interval_ms));
+  Home home;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  ++clock_ms;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  clock_ms = UINT32_MAX;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  clock_ms = 0;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+}
+
+static void long_idle(uint32_t elapsed) {
+  begin_case("long inactive page", 100);
+  Home home;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  clock_ms += elapsed;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+}
+
+static void force_at(uint32_t initial, uint32_t forced) {
+  begin_case("forced input", initial);
+  Home home;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  clock_ms = forced;
+  CHECK(!home.input('x'));
+  CHECK(home.task.toggles == 0);
+  home._page = HomePage::OTHER;
+  CHECK(!home.input(KEY_ENTER));
+  CHECK(home.task.toggles == 0);
+  home._page = HomePage::SENSORS;
+  CHECK(home.input(KEY_ENTER));
+  CHECK(home.task.toggles == 1);
+  CHECK(sensors.calls == 1);
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2 && home.sensors_nb == 1);
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+}
+
+static void completion_anchor(bool wrap) {
+  begin_case("completion-relative cadence", wrap ? UINT32_MAX - 10 : 100);
+  Home home;
+  sensors.duration_ms = 37;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  const uint32_t completion = clock_ms;
+  clock_ms = completion + interval_ms - 1;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+  ++clock_ms;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 2);
+  CHECK(clock_ms == uint32_t(completion + interval_ms + sensors.duration_ms));
+}
+
+static void empty_query_keeps_base_voltage() {
+  begin_case("empty sensor query", 100);
+  Home home;
+  CHECK(sensors.samples == 0);
+  home.refresh_sensors();
+  CHECK(home.sensors_lpp.getSize() == 4 && home.sensors_nb == 1);
+  ++clock_ms;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1);
+}
+
+#if TEST_NEW_UI
+static void allocation_guard() {
+  begin_case("allocation guard", 0);
+  Home home;
+  home.sensors_lpp.allocated = false;
+  home.sensors_nb = 5;
+  home.sensors_scroll = true;
+  home.sensors_scroll_offset = 4;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 0 && board.reads == 0 && home.sensors_lpp.writes == 0);
+  CHECK(home.sensors_nb == 0 && !home.sensors_scroll && home.sensors_scroll_offset == 0);
+  home.sensors_lpp.allocated = true;
+  home.refresh_sensors();
+  CHECK(sensors.calls == 1 && home.sensors_nb == 1);
+}
+#endif
+
+int main(int argc, char** argv) {
+  if (argc == 2 && std::strcmp(argv[1], "force") == 0) {
+    force_at(100, 101);
+  } else {
+    initial_at(0);
+    initial_at(0x80000000u);
+    initial_at(UINT32_MAX);
+    cadence_and_records();
+    wrap_visible();
+    wake_across_wrap();
+    exact_wrap_deadline();
+    long_idle(26u * 24u * 60u * 60u * 1000u);
+    long_idle(UINT32_MAX - 1000);
+    force_at(100, 101);
+    force_at(0x80000000u, 0x80000001u);
+    force_at(UINT32_MAX - 10, 0);
+    completion_anchor(false);
+    completion_anchor(true);
+    empty_query_keeps_base_voltage();
+#if TEST_NEW_UI
+    allocation_guard();
+#endif
+  }
+  std::printf("PASS: %u scenarios; %u checks\n", scenarios, checks);
+}
diff --git a/test/test_home_sensor_refresh.py b/test/test_home_sensor_refresh.py
new file mode 100644
index 000000000..7d838bf0a
--- /dev/null
+++ b/test/test_home_sensor_refresh.py
@@ -0,0 +1,94 @@
+"""Test actual HomeScreen sensor-page refresh and force-input timer bodies.
+
+Both UI implementations are compiled with the sensor page enabled at each
+cadence. This does not claim that every normal board recipe enables that page.
+Clock, task, and board/sensor/LPP boundaries are host fakes, not hardware tests.
+"""
+from pathlib import Path
+import os
+import re
+import shutil
+import subprocess
+import tempfile
+import unittest
+
+from test_replay_reset_integration import extract_braced
+
+ROOT = Path(__file__).resolve().parents[1]
+FIXTURE = ROOT / 'test/fixtures/home_sensor_refresh.cpp'
+
+
+def harness(ui, mutation=None):
+    source = (ROOT / 'examples/companion_radio' / ui / 'UITask.cpp').read_text(encoding='ascii')
+    field_start = source.index('  CayenneLPP sensors_lpp;')
+    refresh_start = source.index('  void refresh_sensors()', field_start)
+    fields = source[field_start:refresh_start]
+    # Keep sensor fields exactly as declared, without the neighboring radio UI.
+    fields = fields.split('  uint32_t _radio_profile_page_started_at')[0]
+    refresh = extract_braced(source, 'void refresh_sensors()')
+    key = 'key' if ui == 'ui-new' else 'c'
+    input_block = extract_braced(source,
+                                f'if ({key} == KEY_ENTER && _page == HomePage::SENSORS)')
+    if mutation == 'no-force-invalidation':
+        if input_block.count('sensors_lpp.reset();') != 1:
+            raise AssertionError('sensor-page input must explicitly invalidate its LPP cache')
+        input_block = input_block.replace('sensors_lpp.reset();', '', 1)
+    elif mutation == 'no-empty-marker':
+        refresh, count = re.subn(r'sensors_lpp\.getSize\(\)\s*==\s*0\s*\|\|\s*',
+                                 '', refresh, count=1)
+        if count != 1:
+            raise AssertionError('refresh must recognize its empty initial/forced cache')
+    code = FIXTURE.read_text(encoding='ascii')
+    for token, value in {'FIELDS': fields, 'REFRESH': refresh,
+                         'KEY': key, 'INPUT': input_block}.items():
+        code = code.replace('@' + token + '@', value)
+    return code
+
+
+class HomeSensorRefreshTest(unittest.TestCase):
+    def test_actual_sensor_page_cadence_wrap_force_and_allocation(self):
+        self.run_variants()
+
+    def test_missing_force_invalidation_fails_intended_regression(self):
+        self.run_variants('no-force-invalidation', 'force', 'FAIL forced input:')
+
+    def test_missing_empty_marker_fails_first_poll_at_zero(self):
+        self.run_variants('no-empty-marker', None, 'FAIL fresh page:')
+
+    def run_variants(self, mutation=None, argument=None, expected_failure=None):
+        compiler = shutil.which('g++') or shutil.which('clang++')
+        if compiler is None:
+            self.skipTest('a host C++17 compiler is required')
+        sanitize = [] if os.name == 'nt' else [
+            '-fsanitize=address,undefined', '-fno-sanitize-recover=all',
+            '-fno-pie', '-no-pie']
+        with tempfile.TemporaryDirectory(prefix='home-sensor-refresh-') as directory:
+            work = Path(directory)
+            for ui in ('ui-new', 'ui-tiny'):
+                source = work / (ui + '.cpp')
+                source.write_text(harness(ui, mutation), encoding='ascii')
+                for auto_off in (15000, 0):
+                    with self.subTest(ui=ui, auto_off=auto_off):
+                        binary = work / (ui + '-' + str(auto_off) +
+                                         ('.exe' if os.name == 'nt' else ''))
+                        compiled = subprocess.run([
+                            compiler, '-std=c++17', '-O1', '-g', '-Wall', '-Wextra', '-Werror',
+                            *sanitize, '-DAUTO_OFF_MILLIS=' + str(auto_off),
+                            '-DTEST_NEW_UI=' + str(int(ui == 'ui-new')),
+                            str(source), '-o', str(binary),
+                        ], text=True, capture_output=True, timeout=60)
+                        self.assertEqual(compiled.returncode, 0, compiled.stdout + compiled.stderr)
+                        tested = subprocess.run([str(binary), *([argument] if argument else [])],
+                                                text=True, capture_output=True, timeout=10)
+                        if expected_failure:
+                            self.assertEqual(tested.returncode, 1, tested.stdout + tested.stderr)
+                            self.assertIn(expected_failure, tested.stderr)
+                            self.assertNotIn('AddressSanitizer:', tested.stderr)
+                            self.assertNotIn('runtime error:', tested.stderr)
+                        else:
+                            self.assertEqual(tested.returncode, 0, tested.stdout + tested.stderr)
+                            self.assertRegex(tested.stdout, r'PASS: (15|16) scenarios; \d+ checks')
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/test/test_t096_full_memory.py b/test/test_t096_full_memory.py
index 87dc2e217..6d1f91231 100644
--- a/test/test_t096_full_memory.py
+++ b/test/test_t096_full_memory.py
@@ -98,7 +98,7 @@ class T096FullMemoryTest(unittest.TestCase):
 #define AUTO_OFF_MILLIS 15000
 #define UI_RECENT_LIST_SIZE 3
 #define TELEM_CHANNEL_SELF 0
-unsigned long millis() { return 100; }
+uint32_t millis() { return 100; }
 struct Lpp {
   uint8_t storage[8];
   bool allocated = false;
@@ -121,7 +121,8 @@ struct Board { int getBattMilliVolts() { return 4000; } } board;
 struct Sensors { int calls = 0; void querySensors(int, Lpp&) { ++calls; } } sensors;
 struct Home {
   Lpp sensors_lpp;
-  int sensors_nb = 5, sensors_scroll_offset = 4, next_sensors_refresh = 0;
+  int sensors_nb = 5, sensors_scroll_offset = 4;
+  uint32_t last_sensors_refresh = 0;
   bool sensors_scroll = true;
   @REFRESH@
 };
@@ -133,7 +134,7 @@ int main() {
   home.sensors_lpp.allocated = true;
   home.refresh_sensors();
   assert(home.sensors_nb == 1 && sensors.calls == 1);
-  assert(home.next_sensors_refresh == 5100);
+  assert(home.last_sensors_refresh == 100);
   home.refresh_sensors();
   assert(sensors.calls == 1);
 }