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Open the main breaker for 5 minutes and see if the unit resets. Momentary power fluctuations can cause odd behavior, especially in older units. This could also have been the final jolt that killed a failing capacitor.
The humming coming from the blower is probably your blower not operating. It may be a number of things.if you turn you AUTO-ON setting at your t-stat to the ON position, it should operate your blower (indoor) only. If that does not bring the blower on its probably not your t-stat. Check all your breakers, both at the indoor unit(if equipped you should be able to see them without removing any panels), and at your breaker panel. If a breaker is tripped, reset it and then AUTO to ON again at the t-stat. If no luck it may be the blower motor or any component that connects to the motor. Call a tech.
Its possible that you have too much Freon and also if the fan in the condenser is coming on you need to make sure the compressor is running too. Some of them are quiet. Grab the line and see if you can feel refrigerant running through them to see if the compressor is running.
Ok first there should be a switch on the wall near the Condensing unit this is the unit outside Switch off for 10 sec and then back on if cant locate switch just switch circuit breaker labeled with Ac or just switch main circuit breaker off for ten seconds
Generally, the fuses are located in a box outside by the outdoor unit. The box has a door on it and you will probably have to pull a cartridge out and the fuses will be behind the cartridge. If you don't have an ohm meter to check the fuses , just go to home depot, lowes or another hardware store where they can check them for you. Be sure to check the circuit breakers too.
It maybe the blower motor. Determine if the blower motor is getting ac, if not getting ac to the blower motor then there might be a breaker, which would probably be located somewere near the motor, or the motor has an internal breaker or fuse.
First check the breakers for the condensing unit (outside unit) and the disconect outside by the unit (could be a breaker ,a pull off/on switch or fuses)If its ok , you should have 220 ,240 volts to the unit contactor (you'll see it after removing the cover on the condensing unit).When the termostat is in the cold position and the temperature its set is lower than the one inside the house the contactor should be pulled in and give power to the compresor and the fan.But if the termostat is in the cooldest set and the blower inside the house works and the contactor in the condensing unit is not pull in the problem is in the termostat or in the low voltage wire.
Sounds like you might have more than one issue. If the breaker is tripping could be the compressor. If you have to press in the contacts to make it come on something is not sending 24 volts to the contactor. may be a bad wire that runs from the outdoor unit to the control board in the furnace.
Is the outside compressor running? Check the fuses in the outside disconnect by the outside condensing unit. Also check the breaker for the A/C in the main power panel.
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