Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to check an ac compressor [title] Turn off the power leading to your air conditioning unit. [step] It's important that your power is off so that you don't shock yourself when checking the compressor. Many central air units will have a power shutoff switch on the wall next to the unit.

Ending1: If the power switch isn't on, unplug it, carefully unscrew the fans, and pull out the coolers and shutoff valves. [substeps] Read the owner's manual to determine how to shut down your air conditioner. Ending2: When changing the switch to off you'll need to manually unscrew the switch and, using your fingers, mark exactly where the switch will be, and turn it off in a place where you can see the switch. [title] Turn the breaker back on at least an hour earlier than you planned. Ending3: If yours isn't you may have to disconnect it before working the compressor. [substeps] Some ac compressors come completely unmounted, including standard air compressors, those that already have batteries, and cordless models such as yours. Ending4: Find the switch and switch it to the off position. [substeps] If there is no switch, find the circuit breaker that controls the power to the area of the house where the ac unit is.

Answer format: ending1/ending2/ending3/ending4