Step 4: Air Conditioner Isn't Working - Check Your AC Drain Pan
Underneath your air conditioner is a drain pan, which is meant to accumulate any residual condensation that your AC wasn't able to drain out. If your AC drain pan is full, it may have triggered the float switch; a switch designed to stop your air conditioner from flooding your house with residual condensation. Good idea, right?
Over time - especially in humid climates - these drains can become clogged, which will then spill into your drain pan. Your drain pan should also have a secondary drain (to keep this from happening). Once your drain pan drain is clogged and your drain pan itself is full, this should trigger your float switch to turn your AC off. Your AC won't turn on until you clean out your drains, and get the float switch back into the DOWN position.
Step 5: AC Won't Turn On - Check the AC Shutoff Switch
When your air conditioner won't turn on, do you ever ask yourself, "did I turn the AC switch off?" Probably not...but that might be exactly what you did.
Air conditioners and furnaces are often installed with an ON/OFF switch that looks just like the light switches in your home, only this switch is there so that lazy HVAC proletarians - like me - can easily remove power while troubleshooting and servicing.
1.Look at the inside portion of your air conditioner, and all around it for a light switch.
2.It should be relatively close to the AC system itself.
3.When/if you find one, switch it (UP isn't always ON, don't ask me why...) and try your AC again.
Although this is one of the easiest things to check, we have it last on our list because, let's face it, if you knew there was a switch there, is it really probable that you switched it off and didn't know about it?
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