When your wall thermostat display screen is fully functional and responsive, yet your outdoor air conditioning system refuses to turn on, the issue is typically caused by a severed low-voltage control wire, a tripped safety float switch, a faulty outdoor contactor, or a bad capacitor. While the thermostat successfully sends a 24-volt signal, that electrical current may be blocked before it reaches the outdoor condensing unit due to a tripped condensate overflow switch or a disconnected wire at the outdoor unit's low-voltage terminals. Additionally, a failed outdoor compressor contactor will prevent power from reaching the motor. You can troubleshoot by checking the condensate drain pan, inspecting wire connections, and testing voltages. You can verify resolution when troubleshooting allows the 24V signal to close the contactor and start the AC.
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