AC Stopped Working in Folsom: 10 Things to Check Before You Call

Your AC just stopped working. Before you panic, before you pay an after-hours diagnostic fee, work through this checklist. In our experience, roughly 30% of “AC stopped working” service calls in Folsom are caused by something the homeowner can fix in 5 minutes with no tools and no technical knowledge. Here is what to check, in order.

1. Is the Thermostat On?

Sounds obvious. It is also the most common cause of a service call. Check that the thermostat is set to Cool (not Heat, Fan, or Off), the temperature is set below the current room temperature, and the fan is set to Auto rather than On. If the screen is blank, replace the batteries — most thermostats take 2 AA.

2. Is the Breaker Tripped?

Go to your electrical panel and look for a breaker labeled “AC,” “Furnace,” or “Air Handler.” If the switch is in the middle position (not fully on, not fully off), it has tripped. Flip it fully off, then fully on. If it trips again immediately, leave it off and call us — that signals a compressor short or a wiring issue that needs a professional.

3. Is the Air Filter Clogged?

A dirty air filter is the single most common cause of AC failure in Folsom. The system overheats, the safety limit trips, and the system shuts down to protect itself. Pull the filter out (usually in a slot near the indoor air handler or in the return air duct). If it is gray or you cannot see light through it, replace it. Most homes need a new filter every 30–90 days during cooling season.

4. Is the Outdoor Unit Running?

Walk outside and listen to the outdoor condenser unit (the big box on a pad next to the house). You should hear a fan and a low hum from the compressor. If the indoor unit is blowing but the outdoor unit is silent, the problem is almost always one of three things: a tripped disconnect switch at the outdoor unit, a failed capacitor, or a failed contactor. All three need a professional, but they are all quick repairs.

5. Is the Outdoor Unit Dirty or Blocked?

Look at the outdoor unit. Is a shrub or fence within 2 feet? Are the coils packed with leaves or grass clippings? A unit that cannot breathe will overheat and shut down. Clear any debris, gently rinse the coils with a garden hose (never a pressure washer), and let the system run for 30 minutes. If it still shuts down, the next steps need a tech.

6. Is the Condensate Drain Clogged?

Look at the indoor unit. Most modern systems have a small PVC pipe (usually ¾ inch white) coming out of the cabinet near the bottom. If you see water in the drain pan under the unit, the drain is likely clogged. Some units have a float switch that shuts the system down when the pan fills. You can try clearing the drain by pouring 1 cup of white vinegar into the access port — if that does not work, call us.

7. Is the System in “Safety Lockout” Mode?

Many modern systems enter a 5-minute lockout after a fault. If you just had a power blink or a brief outage, the system may be locked out. Turn the thermostat to Off, wait 5 minutes, then turn it back to Cool. If the system does not restart, the next step is a real diagnostic.

8. Is the Refrigerant Low?

This one you cannot check yourself, but you can look for symptoms. If the system is running but blowing warm or room-temperature air, and the air feels less cold than usual, low refrigerant is a likely cause. A Folsom AC system should never lose refrigerant under normal operation — if it is low, there is a leak that needs to be found and repaired before a recharge.

9. Is the Evaporator Coil Frozen?

If you see ice or frost on the refrigerant line or the coil (you may need to open the indoor unit cabinet to check), the coil is frozen. Turn the system off at the thermostat and let it thaw for 2–4 hours with the fan set to “On” (not Auto). Once thawed, replace the air filter. If it freezes again within a day, call us — this is almost always a refrigerant leak or a blower motor issue.

10. Is the System Just Old?

Air conditioners in Folsom last 12–18 years with proper maintenance. If your system is in that age range and you have had multiple repairs in the last 24 months, it may be at the end of its useful life. We can do a cost-benefit analysis comparing one more repair to a full replacement — usually free as part of the diagnostic visit.

When to Stop Troubleshooting and Call a Real Tech

Stop and call us if:

• You see or smell burning from the system
• Water is leaking into a living space (not just into the drain pan)
• The breaker keeps tripping after you reset it
• You hear grinding, screeching, or loud banging from either the indoor or outdoor unit
• You have already worked through the checklist above and the system is still not cooling

If You Need a Folsom AC Tech

Call (279) 212-0393 24/7 for emergency calls, or request a same-day appointment online for non-emergency issues. We will quote the diagnostic fee in advance, dispatch a tech with a fully stocked truck, and give you a firm written quote before any work starts.