Pool and Spa
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What brand of spa is this and is the display showing any errors or anything at all?
Is there any chance it was already iced up in the lines before you started trying to get it started up? The Dashes on the screen like that normally indicates that there's no water flow through the heater, so that could be a bad circ pump or if the circ pump has ice in it, it won't turn either. If nothing at all is running then we'd need to open it up and put your hand on the small circulation pump that's hooked up to the stainless steel heater to see if the pump is vibrating at all or if it's very hot to the touch.
Ok, is hard to see it, but when that pump comes on for that 30 seconds can you see if it's making the water move in the spa? That pump may not be doing anything, if that's the case then it wound need replaced. They normally have a life span of about 5 years or so