From 37ac540a269ccfb5e75eaa723421b1c6f76def94 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <thinkyhead@users.noreply.github.com>
Date: Wed, 24 Aug 2016 21:34:30 -0500
Subject: [PATCH] Fix unsigned/signed comparison in fanPin loop

---
 Marlin/temperature.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index b3775ba6a..353732dfa 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -479,7 +479,7 @@ int Temperature::getHeaterPower(int heater) {
     }
  
     uint8_t fanDone = 0;
-    for (int8_t f = 0; f < COUNT(fanPin); f++) {
+    for (uint8_t f = 0; f < COUNT(fanPin); f++) {
       int8_t pin = fanPin[f];
       if (pin >= 0 && !TEST(fanDone, fanBit[f])) {
         unsigned char newFanSpeed = TEST(fanState, fanBit[f]) ? EXTRUDER_AUTO_FAN_SPEED : 0;