--- a/brewco/pid.c	Tue Dec 22 21:07:14 2015 +0100
+++ b/brewco/pid.c	Sat Dec 26 21:45:44 2015 +0100
@@ -66,6 +66,11 @@
 	    pid->ITerm = pid->outMax;
 	else if (pid->ITerm < pid->outMin)
 	    pid->ITerm = pid->outMin;
+	/*
+	 * If turned to manual, turn output off.
+	 */
+	if (Mode == P_MANUAL)
+	    *pid->myOutput = pid->outMin;
     }
     pid->inAuto = newAuto;
 }