1. Check your electrical panel for a tripped breaker. It would be wise to schedule a service call if this continues to trip.
2. Check that your emergency switch is in the ON position. It is a red switch by your furnace, at the top of your stairs or in your utility room.
3. Check if your filter is clogged. If so, it will shut down your system for safety reasons.
4. Look at your thermostat:
a. Is the screen blank? It needs batteries.
b. Is the A/C in the ON position?
c. If it is a programable thermostat, did it lose the program and shut down the A/C? If this happens, turn down the A/C a degree or two and then press the HOLD button for several seconds which will override the program.
5. Located by your condenser outside your home (which is part of your A/C unit, there is a DISCONNECT with a handle---DO NOT open the box, rather check to see if the lever is in the UP/ON position. If it is in the DOWN position, that means it is off. If this appears to trip a lot, it is wise to schedule a service call.
6. Is your coil frozen? That’s the part of the A/C which is inside—connected to your furnace or air handler. A frozen coil is one of the most common reasons air conditioners will not blow cold air. Fortunately, it’s also a problem that can often be solved without having to call for professional repairs:
a. Is the airflow restricted possibly from a dirty filter?
b. Is the A/C low on refrigerant?
c. Is the outside temperature too low? This usually happens overnight.
d. Do you see any broken parts?
e. Try turning off the A/C and set the fan to RUN/AUTO on your thermostat to melt the ice around the coil. Check the air filter. Clean it up or change it. Check the ductwork for obstructions or disconnections, and ensure no registers are blocked. If your AC still freezes up, you either have low refrigerant (a leak!) or the refrigerant line could be damaged.
