diff -r 5874a6480322 -r b69438db19ec thermferm/thermferm.c
--- a/thermferm/thermferm.c	Wed Aug 13 21:04:29 2014 +0200
+++ b/thermferm/thermferm.c	Wed Aug 13 21:21:55 2014 +0200
@@ -722,17 +722,27 @@
 			syslog(LOG_NOTICE, "sp=%.2f pv=%.2f err_old=%.2f err=%.2f P_err=%.2f I_err=%.2f D_err=%.2f Out=%.2f",
 					sp, pv, unit->PID_err_old, err, P_err, unit->PID_I_err, D_err, Out);
 			if (unit->heater_address) {
-			    if (Out >= 2)
+			    if (Out >= 2) {
+				if (! unit->heater_state)
+				    syslog(LOG_NOTICE, "Heater Off => On");
 				unit->heater_state = 100;
-			    else
+			    } else {
+				if (unit->heater_state)
+				    syslog(LOG_NOTICE, "Heater On => Off");
 				unit->heater_state = 0;
+			    }
 			    device_out(unit->heater_address, unit->heater_state);
 			}
 			if (unit->cooler_address) {
-			    if (Out <= -2)
+			    if (Out <= -2) {
+				if (! unit->cooler_state)
+				    syslog(LOG_NOTICE, "Cooler Off => On");
 				unit->cooler_state = 100;
-			    else
+			    } else {
+				if (unit->cooler_state)
+				    syslog(LOG_NOTICE, "Cooler On => Off");
 				unit->cooler_state = 0;
+			    }
 			    device_out(unit->cooler_address, unit->cooler_state);
 			}
 			if (unit->heater_address && unit->cooler_address && unit->fan_address) {
@@ -745,8 +755,12 @@
 			     */
 			    if (((unit->air_temperature - unit->beer_temperature) > 1000) ||
 				((unit->air_temperature - unit->beer_temperature) < -1000)) {
+				if (! unit->fan_state)
+				    syslog(LOG_NOTICE, "Fan Off => On");
 				unit->fan_state = 100;
 			    } else {
+				if (unit->fan_state)
+				    syslog(LOG_NOTICE, "Fan On => Off");
 				unit->fan_state = 0;
 			    }
 			    device_out(unit->fan_address, unit->fan_state);