I have a 2 zone system that intermittently shows temp 2 degrees or so above set point; on one or the other thermostat, day or night. At some point, the condenser kicks back on and everything works fine. Outside temp doesn't matter, it will keep it 70 inside with it 100 outside. The problem is obviously the condenser not coming back on immediately when the thermostat demands cooling. When the temp is above set point, the blower is running, but the condenser unit isn't. Again, after a bit, it does kick back on and bring the temp back down.
A/C intermittently won’t cool
hvac
Best Answer
Your A/C system, your zone controller, and/or your thermostat could have a time delay to prevent the system from turning on and off too often. Short cycling the compressor can be bad for it, so the controllers typically enforce some kind of delay.
The actual delay will vary depending on the controller, so you'd have to get model numbers, etc, and research which device has which delay to figure out exactly what's causing it in your system. There can also be a delay built in before switching from cooling to heating, but that's not what you're running into here.