diff --git a/SicSimulator/Instances/SimulatorSystem.cs b/SicSimulator/Instances/SimulatorSystem.cs
index ac431181..f887b97f 100644
--- a/SicSimulator/Instances/SimulatorSystem.cs
+++ b/SicSimulator/Instances/SimulatorSystem.cs
@@ -153,6 +153,7 @@ namespace SicSimulator.Instances
 
             //
             IO.DI[$"{mod}.DI_HeaterTempUpLimitSW"].Value = false;
+            IO.DI[$"{mod}.DI_HeaterTempLowLimitSW"].Value = true;
             IO.DI[$"{mod}.DI_DORPressVac1SW"].Value = true;
             IO.DI[$"{mod}.DI_DORPressATM1SW"].Value = false;
             IO.DI[$"{mod}.DI_ConfinementRingUp"].Value = true;