From 4dad489a50cb6e5b63968e40ffb3874b70b395b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Morav=C4=8D=C3=ADk?= <roman.moravcik@gmail.com>
Date: Thu, 20 Dec 2018 22:55:30 +0100
Subject: [PATCH] [2.0.x] Limit PID autotune target to maxtemp-15 (#12691)

---
 Marlin/src/module/temperature.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index c086d29e7..89eaee2ef 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -286,6 +286,11 @@ uint8_t Temperature::soft_pwm_amount[HOTENDS];
       next_auto_fan_check_ms = next_temp_ms + 2500UL;
     #endif
 
+    if (target > GHV(BED_MAXTEMP, maxttemp[heater]) - 15)) {
+      SERIAL_ECHOLNPGM(MSG_PID_TEMP_TOO_HIGH);
+      return;
+    }
+
     SERIAL_ECHOLNPGM(MSG_PID_AUTOTUNE_START);
 
     disable_all_heaters();