fix he level edge cases

- a full He reservoir might lead to a timeout message.
  a value of 111 is used instead of a "timeout" error
- likewise, on a warm He reservoir -11.1 is used instead of
  the sensor warm message

tcl/drivers/ccu4.tcl

@@ -539,7 +539,13 @@ proc ccu4::update {} {
       set errvar [silent "" hgetpropval [sct]/$name errvar]
       if {$errvar ne ""} {
         set errval [hvali [sct]/$errvar]
-        if {$errval > 0} {
+        if {$errval == 1} {
+          # sens warm
+          updateval [sct]/$name -11
+        } elseif {$errval == 3} {
+          # timeout
+          updateval [sct]/$name 111
+        } elseif {$errval > 0} {
           hsetprop [sct]/$name geterror [lindex [split [hgetpropval [sct]/$errvar enum] ,] $errval]
           hupdate [sct]/$name $value
         } else {