Cold Extrude will not disable

[mike.h99]

I wantto use my A30pro with a modified hotend to print chocolate.
The extruder motor will not operate at the low hot end temperature of 30 degrees

I am unable to make the M302 P1 S0 cold extrude have any effect when sent directly using repetier-host
The printer also gives little information in the Log Window of Repetier. ( Echo) M111 appears ineffective.

The printer tells me it has firmware version V1.01.01 and hardware version v1.7

The M302 P1 S0 works fine on my Geeetech Pro C

Marlin/Smartto problem ? Which command should I use to disable cold extrusion checking.
I dont want to try and change the source files.