Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -re0265b8fad80add7a5d54db11ecc72fd6b1665a8 -ra21818c35ee6d2db460e2713a003274ac41f1c47
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision e0265b8fad80add7a5d54db11ecc72fd6b1665a8)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision a21818c35ee6d2db460e2713a003274ac41f1c47)
@@ -288,7 +288,7 @@
     if ( isPrimaryHeaterOn || isTrimmerHeaterOn )
     {
         // If the RO pump is not on, turn off the heaters
-        if ( isReverseOsmosisPumpOn() && getMeasuredROFlowRate() < MIN_RO_FLOWRATE_LPM )
+        if ( !isReverseOsmosisPumpOn() || getMeasuredROFlowRate() < MIN_RO_FLOWRATE_LPM )
         {
             if ( ++heatersOnWithNoFlowTimeOut > HEATERS_ON_WITH_NO_FLOW_TIMEOUT_COUNT )
             {