Hi Bob,
Can you please look on the Dashboard on the settingspages of Heimdall there you can see if the Surveillance Mode is actualy set to the desired mode and if the opening of a door is indeed registered and if an Alarm Countdown is started.
Please post your findings here so we have a place to start looking what goes wrong in your situation.
(To have a better readable overview of the Dashboard see this post: Homey Flow for Web - three Column view [CSS customization])
