I have now added
{if chamber_temperature[0] == 0}
M141 S32 ; fallback als 0 opgegeven
{else}
M141 S{chamber_temperature[0]}
{endif}
to the start gcode in orcaslicer after the second g28. this will set the target chamber temperature regardless of the “Activate temperature control“ on the material settings page. The “Chamber temperature“ will set the target. When the value is 0 it will be set at 32 as many materials have 0 as default.