Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -rda3fb953ff72fc65fc6c8c6b91fd833114cb7cbf -ra06e2c94a2c49609972b28f7ccd0647baabdb9b1
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision da3fb953ff72fc65fc6c8c6b91fd833114cb7cbf)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision a06e2c94a2c49609972b28f7ccd0647baabdb9b1)
@@ -129,10 +129,13 @@
 static U32 heatersOnWithNoFlowTimer;                                                                    ///< Heaters are on but there is no sufficient flow.
 static TEMPERATURE_SENSORS_T primaryHeatersFeedbackTempSensor = TEMPSENSORS_OUTLET_PRIMARY_HEATER;      ///< Primary heaters feedback temperature sensors.
 static TEMPERATURE_SENSORS_T trimmerHeaterFeedbackTempSensor  = TEMPSENSORS_OUTLET_REDUNDANT;           ///< Trimmer heater feedback temperature sensors.
+
+#ifndef IGNORE_HEATERS_MONITOR
 static U32 primaryHeatersInternalTempOutTimer = 0;                                                      ///< Primary heaters internal temperature out of range timer.
 static U32 trimmerHeaterInternalTempOutTimer = 0;                                                       ///< Trimmer heater internal temperature out of range timer.
 static BOOL isPrimaryHeatersTempOutOfRange = FALSE;                                                     ///< Boolean flag to indicate if the primary heaters internal temperature out of range.
 static BOOL isTrimmerHeaterTempOutOfRange = FALSE;                                                      ///< Boolean flag to indicate if the trimmer heater internal temperature out of range.
+#endif
 static BOOL isFlowBelowMin = FALSE;                                                                     ///< Boolean flag to indicate if the flow is below the minimum.
 
 // ********** private function prototypes **********
@@ -177,10 +180,13 @@
     selfTestElapsedTime                = 0;
     primaryHeatersFeedbackTempSensor   = TEMPSENSORS_OUTLET_PRIMARY_HEATER;
     trimmerHeaterFeedbackTempSensor    = TEMPSENSORS_OUTLET_REDUNDANT;
+
+#ifndef IGNORE_HEATERS_MONITOR
     primaryHeatersInternalTempOutTimer = 0;
     trimmerHeaterInternalTempOutTimer  = 0;
     isPrimaryHeatersTempOutOfRange     = FALSE;
     isTrimmerHeaterTempOutOfRange      = FALSE;
+#endif
     isFlowBelowMin                     = FALSE;
 
     // Initialize the PI controller for the primary heaters