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of course it depends on the type . Gas or electric . were we there able to see it . perhaps we could be more helpful . turn off electric at the mains turn off the gas at the outside shutoff . and lock both in the off position . it depends on where you live if you are required to get permits to do this also . or if you have to hire professionals .
the water is condensation from the humidity in the air turning to water on the cold evaporator core
normally it drips into a tray and drains away outside
if it is inside ( running down the walls it indicates
the drain hole and tube is blocked or the evaporator core is covered in gunk and holding the water up and not dripping where it is designed to
Call an accredited ac specialist shop to clean the fins and drain tube
turn off everything electrical in house and retry with good fuse or breaker if still blows unit needs repair possible shorted capacitor? if it runs it may need to be on its own circuit dedicated to it alone
Sounds like it is freezing up. Kind of hard to say since you did not say whether it is a central heat and air system. My overflow was constantly draining onto my patio from overflow. I crawled up in the attic and followed the pvc pipe where it came in from the outside and closer to the central unit in the attic I drilled a hole in the 90 degree elbow of the pvc and unclogged the pipe which was frozen from running so long. Then I covered the hole with silicone. no more leak coming from overflow
sounds like the sensor or bulb that tells it to start the blower is defective/ im not familiar with your unit but this seems the most logical answer most furnace will not turn the blower on right away usually 90 seconds after the ignition but will also run longer to exhume any dangerous carbon monoxide. Electricic heaters are different. What type of unit do you have
You have one of two problems. Either the capacitor for the motor has failed or the motor has failed. I would turn off the power to the unit and see if you can locate the capacitor and remove it. An ac supply or electrical supply house can match up the capacitor. This is relatively inexpensive. Otherwise you will need a new motor.
With a two story house you have to be aware that cold air flows downwards so any cold air coming from an ac unit will flow downstairs( normally down the stairway) so unless you can close off the down stairs then the up stairs unit will be cooling downstairs as well. Ac units have a thermostat located in the air intake and it cools until the cold air has risen to that point. In effect the space above the ac unit will be hotter than the floor. Knowing how they work ,you can see that the upstairs unit will never reach the set temperature because the cold air is continually heating from the house and will never get to the top thermostat.
So your solutions are
1-- fit controls that restrict the cold air from leaving the upper floor (Doors)
2--don't run the upper ac unit unless you are living up there (waste of money
)3 place an ac in each upper room and keep the room door closed