Index: firmware/App/Drivers/InternalADC.c
===================================================================
diff -u -r08e11fb11f818dd326617362ca7361b2fae1662a -r5a36a768d11cc597a36b894c1fb3a5e5590130f1
--- firmware/App/Drivers/InternalADC.c	(.../InternalADC.c)	(revision 08e11fb11f818dd326617362ca7361b2fae1662a)
+++ firmware/App/Drivers/InternalADC.c	(.../InternalADC.c)	(revision 5a36a768d11cc597a36b894c1fb3a5e5590130f1)
@@ -164,14 +164,21 @@
     {
         // process readings from last conversion
         for ( i = 0; i < adcRawReadingsCount; i++ )
-        {
-            U32 ch = adcChannelNum2ChannelId[ adcRawReadings[ i ].id ];  // TODO - need to range check .id?
+        {
+            if ( adcRawReadings[ i ].id < NUM_OF_INT_ADC_CHANNELS )
+            {
+                U32 ch = adcChannelNum2ChannelId[ adcRawReadings[ i ].id ];
 
-            adcReadingsTotals[ ch ] -= adcReadings[ ch ][ adcReadingsIdx[ ch ] ];
-            adcReadings[ ch ][ adcReadingsIdx[ ch ] ] = adcRawReadings[i].value;
-            adcReadingsTotals[ ch ] += adcRawReadings[ i ].value;
-            adcReadingsAvgs[ ch ] = adcReadingsTotals[ ch ] >> ROLLING_AVG_SHIFT_DIVIDER;
-            adcReadingsIdx[ ch ] = INC_WRAP( adcReadingsIdx[ ch ], 0, SIZE_OF_ROLLING_AVG - 1 );
+                adcReadingsTotals[ ch ] -= adcReadings[ ch ][ adcReadingsIdx[ ch ] ];
+                adcReadings[ ch ][ adcReadingsIdx[ ch ] ] = adcRawReadings[i].value;
+                adcReadingsTotals[ ch ] += adcRawReadings[ i ].value;
+                adcReadingsAvgs[ ch ] = adcReadingsTotals[ ch ] >> ROLLING_AVG_SHIFT_DIVIDER;
+                adcReadingsIdx[ ch ] = INC_WRAP( adcReadingsIdx[ ch ], 0, SIZE_OF_ROLLING_AVG - 1 );
+            }
+            else
+            {
+                SET_ALARM_WITH_2_U32_DATA( ALARM_ID_DG_SOFTWARE_FAULT, SW_FAULT_ID_INVALID_INT_ADC_CHANNEL_NUMBER, adcRawReadings[ i ].id )
+            }
         }
     }
     else