Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r1e49739be76330ea194f0eb2d30e4643932506a9 -r92b5a051b1a280b4555b2ab779965c6758e47785
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 1e49739be76330ea194f0eb2d30e4643932506a9)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 92b5a051b1a280b4555b2ab779965c6758e47785)
@@ -7,8 +7,8 @@
 *
 * @file    Heaters.c
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      04-Aug-2022
+* @author  (last)      Bill Bracken
+* @date    (last)      22-Aug-2022
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  23-Apr-2020
@@ -64,6 +64,7 @@
 #define DELTA_TEMPERATURE_TIME_COSNTANT_C                          8.6F                                                            ///< Delta temperature calculated from time constant.
 #define PRIMARY_HEATER_DUTY_CYCLE_PER_TEMPERATURE_C                0.03F                                                           ///< Primary heaters duty cycle per temperature in C.
 #define DATA_PUBLISH_COUNTER_START_COUNT                           70                                                              ///< Data publish counter start count.
+#define MIN_RO_HEATER_FLOWRATE_LPM                                 0.2F                                                            ///< Minimum target RO heater flow rate in L/min.
 
 static const F32 WATER_SPECIFIC_HEAT_DIVIDED_BY_MINUTES = 4184 / SEC_PER_MIN;                                                      ///< Water specific heat in J/KgC / 60.
 static const F32 PRIMARY_HEATERS_MAXIMUM_POWER_WATTS    = 475 + 237.5F;                                                            ///< Primary heaters maximum power (main primary = 475W and small primary = 237.5W).
@@ -331,7 +332,7 @@
             // TODO add the function that gets the flow of the new flow sensor for DG. For now it is assumed that trimmer heater flow sensor
             // is not 0 so the heater can run if needed
             F32 measFlow   = ( DG_PRIMARY_HEATER == heater ? getMeasuredROFlowRateLPM() : 50.0 );
-            F32 minFlow    = ( DG_PRIMARY_HEATER == heater ? MIN_RO_FLOWRATE_LPM : MIN_RO_FLOWRATE_LPM );
+            F32 minFlow    = ( DG_PRIMARY_HEATER == heater ? MIN_RO_HEATER_FLOWRATE_LPM : MIN_RO_HEATER_FLOWRATE_LPM );
             BOOL isFlowLow = ( measFlow < minFlow ? TRUE : FALSE );
 
             checkPersistentAlarm( ALARM_ID_DG_FLOW_TOO_LOW_WHILE_HEATER_ON, isFlowLow, measFlow, minFlow );