diff --git a/tcl/fw.config b/tcl/fw.config
index 5833000..94618aa 100644
--- a/tcl/fw.config
+++ b/tcl/fw.config
@@ -9,7 +9,7 @@ makenv tt -driver 340_lsc -port @lsc340a {
   lsc_sensor t2 D -sensor type-c-k1000 -sensorname t2 -alarm 1805
   # lsc_sensor te B -sensor rhfe4140 -sensorname outer -alarm 323
   lsc_sensor p A -sensor vacuum -sensorname vacuum
-  lsc_loop set -loop 1 -channel D -maxheater 0.05A -resist 1000Ohm -linearpower 3000
+  lsc_loop set -loop 1 -channel C -maxheater 0.05A -resist 1000Ohm -linearpower 3000
   hsetprop /tt dblmode disabled
   hsetprop /tt/dblctrl visible false
   hdelprop /tt/dblctrl group