here is what I'm about to try, I to seeing stuff about single room window type box air conditioner s not the whole system, doesn't seem to matter for these checks ..._It's not working at all: the condenser
(for an outdoor unit) or air handler/furnace (indoor unit) are not running.
Make sure it's plugged in. This may seem obvious, but there are occasions when this is exactly the problem. Whether kids, dogs, or an accidental tap with the vacuum cleaner, the plug could be partially or completely dislodged.
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Check the circuit breakers
and fuses. Make sure they are in place, turned on, and functioning properly. Circuits, especially with older homes, are easily overloaded if the air conditioner shares a circuit with appliances such as irons, refrigerators, or microwaves.
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Check your thermostat (cooling control) and make sure it is set to cool at the current temperature, and working properly. As with plugs, sometimes settings can change by accident.
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