diff --git a/src/aio.c b/src/aio.c
index 097604a..c5ecea1 100644
--- a/src/aio.c
+++ b/src/aio.c
@@ -11,10 +11,10 @@ static constexpr uint8_t max_curve_points = 7;
 
 static struct aio_params_t params = {
 	.fans = {
-		.setpoint = 38.5f,
+		.setpoint = 40.0f,
 		.min_duty = 20,
-		.max_duty = 100,
-		.fan_stop = true,
+		.max_duty = 80,
+		.fan_stop = false,
 		.ctrl = {
 			.Ki = 0.1f,
 			.Kd = 10.0f
@@ -233,42 +233,18 @@ void aio_update(struct aio_t *aio) {
 	SET_FANS_DUTY(aio->handle, fan_duty);
 
 	/* pump logic */
-	switch (aio->pump_mode) {
-		case QUIET:
-			if (fan_duty > 40)
-				aio->pump_counter++;
-			else
-				aio->pump_counter = 0;
+	static int16_t counter = 0;
+	if (fan_duty > (float)params.fans.max_duty * 0.75f && counter < 300)
+		counter++;
+	if (fan_duty < (float)params.fans.min_duty * 1.33f && counter > 0)
+		counter--;
 
-			if (aio->pump_counter > 60)
-				aio_set_pump_mode(aio->handle, BALANCED);
-		break;
-
-		case BALANCED:
-			if (fan_duty > 65)
-				aio->pump_counter++;
-			else if (fan_duty < 35 && aio->pump_counter > 0)
-				aio->pump_counter--;
-
-			if (aio->pump_counter > 120)
-				aio_set_pump_mode(aio->handle, EXTREME);
-			else if (aio->pump_counter == 0)
-				aio_set_pump_mode(aio->handle, QUIET);
-		break;
-
-		case EXTREME:
-			if (fan_duty < 60 && aio->pump_counter > 0)
-				aio->pump_counter--;
-
-			if (aio->pump_counter < 60)
-				aio_set_pump_mode(aio->handle, BALANCED);
-			break;
-
-		case UNKNOWN:
-		default:
-			aio_set_pump_mode(aio->handle, BALANCED);
-		break;
-	}
+	if (counter > 280)
+		aio_set_pump_mode(aio->handle, EXTREME);
+	if (counter > 60)
+		aio_set_pump_mode(aio->handle, BALANCED);
+	if (counter == 0)
+		aio_set_pump_mode(aio->handle, QUIET);
 	// applog(LOG_DBG, "aio->pump_counter is %d", aio->pump_counter);
 
 	aio_usb_release(aio->handle);