Index: firmware/App/Controllers/Valves.c
===================================================================
diff -u -r830213bc6dcc1a684610caf78c79d55f2cb41e93 -r07bb4d9dc9f6b2adbf7a6101043313c3ebae7fcc
--- firmware/App/Controllers/Valves.c	(.../Valves.c)	(revision 830213bc6dcc1a684610caf78c79d55f2cb41e93)
+++ firmware/App/Controllers/Valves.c	(.../Valves.c)	(revision 07bb4d9dc9f6b2adbf7a6101043313c3ebae7fcc)
@@ -35,7 +35,7 @@
 #define ENERGIZED                                       1                                                           ///< 1 for energized valve.
 #define ALL_VALVES_DEENERGIZED                          0x0000                                                      ///< 0 in U16 bit field for all valves.
 
-#define VALVE_PWM_PERIOD                                50                                                          ///< Valve PWM Period in 0.1 us res ( 20kHz )
+#define VALVE_PWM_PERIOD                                500                                                          ///< Valve PWM Period in 0.1 us res ( 20kHz )
 #define VALVE_PWM_LOW                                   ( VALVE_PWM_PERIOD * 0.2 )                                  ///< Valve low PWM percentage
 #define VALVE_PWM_PULL_IN                               100                                                         ///< Valve 'strike' period at 100% PWM in ms
 
@@ -174,7 +174,7 @@
         valveSPBits |= 0x01 << ( i - FIRST_SP_VALVE );
     }
 
-    for ( i = FIRST_IO_VALVE; i <= LAST_IO_VALVE; i++ )
+    for ( i = M12_VALV; i <= LAST_IO_VALVE; i++ )
     {
         valveIOBits |= 0x01 << ( i - FIRST_IO_VALVE );
     }