The gist of your condo's system is this: hot water from a central boiler passes through loops of plastic pipe in the floor. The "zone valve" is a control valve that controls the amount of water that passes through the piping in the floor. It opens and closes in response to the signal from the thermostat (too cold and the valve opens, too warm and the valve closes).
This shouldn't be an issue because the boiler, wherever it is, shouldn't even be on in the first place. It hasn't been anywhere near cool enough for the boiler to turn on, even at night, over the last couple weeks.
If the boiler is running, well, that's a whole other problem beyond your control.
This may seem like a silly question but what is your thermostat set to? And which way is your unit facing? (south?)
It doesn't sound like you have air conditioning. Frankly it has been unusually warm for a while now and without air conditioning your condo will probably warm up to somewhere near the ambient temperature (25+) and stay there all night.
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