Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r340d76e1d4dee94b1e721cf2fac15ec8af134294 -ra43996d4383527a14cffe8bc676cccc6bd93c174
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 340d76e1d4dee94b1e721cf2fac15ec8af134294)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision a43996d4383527a14cffe8bc676cccc6bd93c174)
@@ -853,7 +853,7 @@
 static void monitorHeatersVoltage( void )
 {
     // NOTE: Default to using Primary heater voltage from FPGA
-    F32 mainPriVoltage = getMonitoredLineLevel( MONITORED_LINE_24V_PRIM_HTR_V );
+    F32 mainPriVoltage = getMonitoredLineLevel( MONITORED_LINE_24V_PRIM_HTR_GND_V );
 #ifndef _RELEASE_
     if ( SW_CONFIG_ENABLE_VALUE == getSoftwareConfigStatus( SW_CONFIG_ENABLE_V3_SYSTEM ) )
     {