z homing, Heater Decoupled

edited April 2017 in General
First:
I'm not using a z limit switch so i want to disable z homing how to do that?
second:
my heat bed was working properly but suddenly it stopped heating but sensor is doing well as it showing home temp
I started printing and enabled it after a while it starts heating but after a while printing stopped due to heater decouple
the i can't heat it manually but I found out if i touched the two component in the pic i can control it manually but also after a while during printing it shows to me heater decoupled
Third:
when heater decoupled how to continue the object printing after reset by lcd or emergency stop?
thx
image
http://imgur.com/a/3sdio

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