diff --git a/resources/qml/PrintMonitor.qml b/resources/qml/PrintMonitor.qml
index 90111265f0..b34d1af252 100644
--- a/resources/qml/PrintMonitor.qml
+++ b/resources/qml/PrintMonitor.qml
@@ -337,6 +337,10 @@ Column
                 {
                     return false; //Can't preheat if not connected.
                 }
+                if (!connectedPrinter.acceptsCommands)
+                {
+                    return false; //Not allowed to do anything.
+                }
                 if (connectedPrinter.jobState == "printing" || connectedPrinter.jobState == "pre_print" || connectedPrinter.jobState == "resuming" || connectedPrinter.jobState == "error" || connectedPrinter.jobState == "offline")
                 {
                     return false; //Printer is in a state where it can't react to pre-heating.