From 6697a8f3752a32290f876a214a9e46fcaf2a9c53 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Tue, 12 May 2015 18:22:47 -0700
Subject: [PATCH] Watch the heater a little longer

---
 Marlin/temperature.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index a5ee273137..7043eeda0d 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -620,6 +620,7 @@ void manage_heater() {
 
     // Check if the temperature is failing to increase
     #ifdef THERMAL_PROTECTION_HOTENDS
+
       // Is it time to check this extruder's heater?
       if (watch_heater_next_ms[e] && ms > watch_heater_next_ms[e]) {
         // Has it failed to increase enough?
@@ -629,10 +630,11 @@ void manage_heater() {
           _temp_error(e, PSTR(MSG_HEATING_FAILED), PSTR(MSG_HEATING_FAILED_LCD));
         }
         else {
-          // Only check once per M104/M109
-          watch_heater_next_ms[e] = 0;
+          // Start again if the target is still far off
+          start_watching_heater(e);
         }
       }
+
     #endif // THERMAL_PROTECTION_HOTENDS
 
     #ifdef TEMP_SENSOR_1_AS_REDUNDANT