Index: firmware/App/Drivers/GLXferPump.h
===================================================================
diff -u -r1e806f55dd70e314a8bbb70c5233443dc807998a -re7525696d18a5a7c7481fc6a920e95d227a6e72f
--- firmware/App/Drivers/GLXferPump.h	(.../GLXferPump.h)	(revision 1e806f55dd70e314a8bbb70c5233443dc807998a)
+++ firmware/App/Drivers/GLXferPump.h	(.../GLXferPump.h)	(revision e7525696d18a5a7c7481fc6a920e95d227a6e72f)
@@ -36,6 +36,7 @@
 #define AIR_PUMP_MOTOR_OFF            0.0F            ///< Power level setting (PWM) for H12 air pump to turn pump off.
 #define AIR_PUMP_DUTY_CYCLE_MIN       0.0F            ///< Air pump minimum duty cycle in percentage
 #define AIR_PUMP_DUTY_CYCLE_MAX       100.0F          ///< Air pump maximum duty cycle in percentage
+#define AIR_PUMP_DUTY_CYCLE_LIMIT     24.0F           ///< Air pump limit duty cycle in percentage from 1- 23 as invalid
 #define AIR_PUMP_MAX_PWM              250             ///< Air pump maximum PWM, FPGA ignores 251-255
 
 // ********** public function prototypes **********