Announcement: LB Chase Earns Industry-Leading NPS® Score in Customer Satisfaction.
LB Chase Heating & Air
Justin Wood, General Manager
Email Justin: GM@LBchase.com
Rated 4.9 on 
(393 Reviews)
Lead Funnel - AC Won't Turn On Appointment
LB Chase is Rated 4.9 on and Received an Industry Leading NPS® Score in Customer Satisfaction
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About Our AC Won't Turn On or Off Service Appointments
Justin Wood, General Manager
Email me: GM@LBchase.com
When your AC will not turn on, will not shut off, or only responds after flipping the breaker, it usually means something in the system is not communicating correctly. The issue may be simple, like thermostat settings, weak batteries, a tripped breaker, or a clogged air filter. It may also involve a safety switch, low-voltage fuse, wiring problem, failed capacitor, contactor, blower motor, or outdoor unit issue.
After you complete the short form above, an LB Chase comfort advisor will contact you within 1–2 hours during normal business hours to help schedule your appointment. Our technician will inspect the thermostat, breaker, indoor air handler, outdoor condenser, drain safety switch, electrical components, airflow, and system operation to find the real cause of the problem.
We will explain what we find in plain language, review your repair options, and help you decide the right next step for your home. If your system can be repaired, we will tell you. If the equipment is older, unreliable, unsafe, or no longer cost-effective to repair, we can also walk you through replacement options.
LB Chase Heating & Air has served Sevierville, Maryville, Seymour, Kodak, Pigeon Forge, and surrounding East Tennessee communities since 1995. Our goal is simple: get your home cooling again with honest diagnostics, clear communication, and no-pressure recommendations.
Frequently asked questions about why your AC won't turn on or off
Why won’t my AC turn on?
Your AC may not turn on because of thermostat settings, dead thermostat batteries, a tripped breaker, a clogged air filter, a clogged drain line safety switch, blown fuse, wiring issue, failed capacitor, or a malfunctioning motor. Carrier lists tripped breakers, blown fuses, thermostat issues, clogged filters, wiring problems, and motor failure as common causes.
Why won’t my AC turn on even though the thermostat works?
If the thermostat display works but the AC will not start, the problem may be in the HVAC system itself. Common causes include a tripped breaker, clogged drain safety switch, blown low-voltage fuse, control board issue, capacitor failure, contactor failure, or outdoor unit problem. A battery-powered thermostat screen does not always mean the HVAC system has proper low-voltage power.
Why won’t my AC turn on after flipping the breaker?
If your AC will not turn on after resetting the breaker, make sure the breaker is fully moved to OFF and then back to ON. If it trips again, do not keep resetting it. Repeated breaker trips can point to an electrical issue, compressor problem, short, capacitor failure, or unsafe wiring condition that should be inspected by a professional.
Why won’t my AC turn on with the thermostat?
Your thermostat may not be sending the cooling signal because it is set incorrectly, has weak batteries, has loose wiring, lacks C-wire power, or has lost communication with the HVAC system. Google Nest support notes that if the system does not work with the old thermostat either, the issue may be with the HVAC system, such as a blown fuse or bad breaker.
Why is my thermostat blank and my AC won’t turn on?
A blank thermostat often means the thermostat has lost power. Possible causes include dead batteries, a tripped breaker, blown low-voltage fuse, clogged condensate drain safety switch, loose wiring, or an air handler power issue. Some drain safety switches can shut the system down if the condensate line backs up.
Why is my outside AC unit not turning on?
If the indoor fan runs but the outside AC unit does not, the issue may be the outdoor disconnect, breaker, capacitor, contactor, compressor, fan motor, wiring, or control signal from the thermostat. The outdoor unit needs both high-voltage power and the correct low-voltage signal to start.
Why won’t my AC turn off?
If your AC will not turn off, first check whether the thermostat is set below the room temperature and whether the fan is set to ON instead of AUTO. If the system keeps running after settings are corrected, possible causes include a thermostat malfunction, stuck relay, electrical issue, frozen coil, airflow restriction, low refrigerant, or fan limit switch problem.
Should I call an HVAC technician if my AC won’t turn on or off?
Yes, call a technician if the breaker trips again, the thermostat is blank, the outdoor unit will not start, the system will not shut off, you see water near the air handler, or basic thermostat and filter checks do not solve the problem. Electrical components, fuses, capacitors, contactors, control boards, and wiring should be diagnosed safely by a qualified HVAC technician.