diff --git a/monitor/fan.cpp b/monitor/fan.cpp
index 8a30300..52b4031 100644
--- a/monitor/fan.cpp
+++ b/monitor/fan.cpp
@@ -61,8 +61,11 @@
             rules::argNpath(0, util::INVENTORY_PATH + _name),
         std::bind(std::mem_fn(&Fan::presenceIfaceAdded), this,
                   std::placeholders::_1)),
-    _fanMissingErrorDelay(std::get<fanMissingErrDelayField>(def))
+    _fanMissingErrorDelay(std::get<fanMissingErrDelayField>(def)),
+    _countInterval(std::get<countIntervalField>(def))
 {
+    bool enableCountTimer = false;
+
     // Start from a known state of functional (even if
     // _numSensorFailsForNonFunc is 0)
     updateInventory(true);
@@ -80,6 +83,23 @@
             std::get<nonfuncRotorErrDelayField>(def), event));
 
         _trustManager->registerSensor(_sensors.back());
+        if (_sensors.back()->getMethod() == MethodMode::count)
+        {
+            enableCountTimer = true;
+        }
+    }
+
+    // If the error checking method will be 'count', then it needs a timer.
+    // The timer is repeating but is disabled immediately because it doesn't
+    // need to start yet.
+    if (enableCountTimer)
+    {
+        _countTimer = std::make_unique<
+            sdeventplus::utility::Timer<sdeventplus::ClockId::Monotonic>>(
+            event, std::bind(&Fan::countTimerExpired, this),
+            std::chrono::seconds(_countInterval));
+
+        _countTimer->setEnabled(false);
     }
 
 #ifndef MONITOR_USE_JSON
@@ -170,6 +190,12 @@
 {
     _monitorReady = true;
 
+    if (_countTimer)
+    {
+        _countTimer->resetRemaining();
+        _countTimer->setEnabled(true);
+    }
+
     std::for_each(_sensors.begin(), _sensors.end(), [this](auto& sensor) {
         if (_present)
         {
@@ -234,7 +260,28 @@
         }
     }
 
-    process(sensor);
+    // If using the timebased method to determine functional status,
+    // check now, otherwise let _countTimer handle it.  A timer is
+    // used for the count method so that stuck sensors will continue
+    // to be checked.
+    if (sensor.getMethod() == MethodMode::timebased)
+    {
+        process(sensor);
+    }
+}
+
+void Fan::countTimerExpired()
+{
+    // For sensors that use the 'count' method, time to check their
+    // status and increment/decrement counts as necessary.
+    for (auto& sensor : _sensors)
+    {
+        if (_trustManager->active() && !_trustManager->checkTrust(*sensor))
+        {
+            continue;
+        }
+        process(*sensor);
+    }
 }
 
 void Fan::process(TachSensor& sensor)
@@ -455,6 +502,12 @@
                             sensor->setFunctional(true);
                             _system.fanStatusChange(*this, true);
                         }
+
+                        // Set the counters back to zero
+                        if (sensor->getMethod() == MethodMode::count)
+                        {
+                            sensor->resetMethod();
+                        }
                     }
                     catch (const util::DBusServiceError& e)
                     {
@@ -509,6 +562,11 @@
                 sensor->stopTimer();
             }
         });
+
+        if (_countTimer)
+        {
+            _countTimer->setEnabled(false);
+        }
     }
 #endif
 }
diff --git a/monitor/fan.hpp b/monitor/fan.hpp
index 4bf1757..92016b1 100644
--- a/monitor/fan.hpp
+++ b/monitor/fan.hpp
@@ -176,6 +176,12 @@
      */
     void powerStateChanged(bool powerStateOn);
 
+    /**
+     * @brief Timer callback function that deals with sensors using
+     *        the 'count' method for determining functional status.
+     */
+    void countTimerExpired();
+
   private:
     /**
      * @brief Returns true if the sensor input is not within
@@ -320,6 +326,20 @@
     std::unique_ptr<
         sdeventplus::utility::Timer<sdeventplus::ClockId::Monotonic>>
         _fanMissingErrorTimer;
+
+    /**
+     * @brief The interval, in seconds, to use for the timer that runs
+     *        the checks for sensors using the 'count' method.
+     */
+    size_t _countInterval;
+
+    /**
+     * @brief The timer whose callback function handles the sensors
+     *        using the 'count' method for determining functional status.
+     */
+    std::unique_ptr<
+        sdeventplus::utility::Timer<sdeventplus::ClockId::Monotonic>>
+        _countTimer;
 };
 
 } // namespace monitor
diff --git a/monitor/gen-fan-monitor-defs.py b/monitor/gen-fan-monitor-defs.py
index 4452a85..b77ea59 100755
--- a/monitor/gen-fan-monitor-defs.py
+++ b/monitor/gen-fan-monitor-defs.py
@@ -56,6 +56,7 @@
                   ${fan_data['deviation']},
                   ${fan_data['num_sensors_nonfunc_for_fan_nonfunc']},
                   0, // Monitor start delay - not used in YAML configs
+                  0, // Count interval - not used in YAML configs
                   std::nullopt, // nonfuncRotorErrorDelay - also not used here
                   std::nullopt, // fanMissingErrorDelay - also not used here
                   std::vector<SensorDefinition>{
diff --git a/monitor/json_parser.cpp b/monitor/json_parser.cpp
index 9218634..888a57d 100644
--- a/monitor/json_parser.cpp
+++ b/monitor/json_parser.cpp
@@ -216,6 +216,7 @@
         // Method is optional and defaults to time based functional
         // determination
         size_t method = MethodMode::timebased;
+        size_t countInterval = 1;
         if (fan.contains("method"))
         {
             auto methodConf = fan["method"].get<std::string>();
@@ -230,6 +231,15 @@
                 log<level::ERR>("Invalid fan method");
                 throw std::runtime_error("Invalid fan method");
             }
+
+            // Read the count interval value used with the count method.
+            if (method == MethodMode::count)
+            {
+                if (fan.contains("count_interval"))
+                {
+                    countInterval = fan["count_interval"].get<size_t>();
+                }
+            }
         }
 
         // Timeout defaults to 0
@@ -323,7 +333,7 @@
 
         fanDefs.emplace_back(std::tuple(
             fan["inventory"].get<std::string>(), method, funcDelay, timeout,
-            deviation, nonfuncSensorsCount, monitorDelay,
+            deviation, nonfuncSensorsCount, monitorDelay, countInterval,
             nonfuncRotorErrorDelay, fanMissingErrorDelay, sensorDefs, cond));
     }
 
diff --git a/monitor/tach_sensor.cpp b/monitor/tach_sensor.cpp
index 83285b9..fa62045 100644
--- a/monitor/tach_sensor.cpp
+++ b/monitor/tach_sensor.cpp
@@ -167,7 +167,14 @@
 
 void TachSensor::processState()
 {
-    _fan.process(*this);
+    // This function runs from inside trust::Manager::checkTrust(), which,
+    // for sensors using the count method, runs right before process()
+    // is called anyway inside Fan::countTimerExpired() so don't call
+    // it now if using that method.
+    if (_method == MethodMode::timebased)
+    {
+        _fan.process(*this);
+    }
 }
 
 void TachSensor::resetMethod()
@@ -275,6 +282,11 @@
         if (_counter < _threshold)
         {
             ++_counter;
+            log<level::DEBUG>(
+                fmt::format(
+                    "Incremented error counter on {} to {} (threshold {})",
+                    _name, _counter, _threshold)
+                    .c_str());
         }
     }
     else
@@ -282,6 +294,11 @@
         if (_counter > 0)
         {
             --_counter;
+            log<level::DEBUG>(
+                fmt::format(
+                    "Decremented error counter on {} to {} (threshold {})",
+                    _name, _counter, _threshold)
+                    .c_str());
         }
     }
 }
diff --git a/monitor/types.hpp b/monitor/types.hpp
index a7f61d1..15b1f1a 100644
--- a/monitor/types.hpp
+++ b/monitor/types.hpp
@@ -119,14 +119,15 @@
 constexpr auto fanDeviationField = 4;
 constexpr auto numSensorFailsForNonfuncField = 5;
 constexpr auto monitorStartDelayField = 6;
-constexpr auto nonfuncRotorErrDelayField = 7;
-constexpr auto fanMissingErrDelayField = 8;
-constexpr auto sensorListField = 9;
-constexpr auto conditionField = 10;
+constexpr auto countIntervalField = 7;
+constexpr auto nonfuncRotorErrDelayField = 8;
+constexpr auto fanMissingErrDelayField = 9;
+constexpr auto sensorListField = 10;
+constexpr auto conditionField = 11;
 
 using FanDefinition =
     std::tuple<std::string, size_t, size_t, size_t, size_t, size_t, size_t,
-               std::optional<size_t>, std::optional<size_t>,
+               size_t, std::optional<size_t>, std::optional<size_t>,
                std::vector<SensorDefinition>, std::optional<Condition>>;
 
 constexpr auto presentHealthPos = 0;