diff --git a/tcl/drivers/hepump.tcl b/tcl/drivers/hepump.tcl
index 5f0a952..1cdeb09 100644
--- a/tcl/drivers/hepump.tcl
+++ b/tcl/drivers/hepump.tcl
@@ -400,9 +400,10 @@ proc hepump::get_auto {} {
   if {$auto && $oldeco != 2} {
     set eco [sctval [sct parent]/eco]
     set lim [sctval [sct parent]/eco_t_lim 7]
-    if {[silent 10 hval /tt/target] < $lim && [silent 10 hval /tt] < 2 * $lim} {
+    set target [silent [silent $lim hval /tt/target] hval /tt/set/reg]
+    if {$target < $lim && [silent $lim hval /tt] < 2 * $lim} {
       set ecoset 0
-    } elseif {[silent 10 hval /tt/target] > $lim || [silent 10 hval /tt] > 3 * $lim} {
+    } elseif {$target > $lim || [silent $lim hval /tt] > 3 * $lim} {
       set ecoset 1
     } else {
       set ecoset $eco