you're in the
home improvement zone--YOUR HANDYMAN ZONE!
and Ventilation Systems Category:
Central air conditioner does not turn on
automatically at all.
/ Materials (See Below
Screwdriver (or other fastening device as determined by the
manufacturer's use of fasteners)
Circuit breaker fuse replacement
Manufacturer's instruction manual for the central air
There are a number of possible causes for your central air conditioner's
failure to turn on automatically at all.
If your central air conditioner does not turn on
automatically at all, do the following:
foremost, make sure that the thermostat is on the setting of
"cool" and that otherwise the thermostat is set to a desired
temperature that is below the room temperature.
that your circuit breaker is turned to "on,"
and if need be, replace any burned out circuit breaker fuse.
A central air conditioner is designed for a 240-volt circuit
system specifically for its use. (See the electrical section.)
As a last
preliminary step before taking an in-depth look at and
performing work on the air conditioner, be sure that the power
switch for the furnace is turned on, that the power switch of
the outside condenser of the air conditioner is turned just as
well, and that the 240-volt disconnect mechanism usually found
near the compressor of the air conditioner is not shut off, but
Caution: When dealing with any device that
requires electrical power, make sure you take precautions before
you work on it, including disconnecting the power.
If the above does
not solve the problem, check the interior of the thermostat by
unfastening its cover and removing it, using a screwdriver or
other fastening device that is appropriate.
anything else, as a precaution,
use a voltage meter to make sure that the wires connected to the
thermostat are not live (have no power running through them).
(You should have disconnected the power to the fan from the
circuit breaker long ago, if you haven't done so already.)
Upon making sure
there is no running power, using a screwdriver, unscrew the wire
from the Y terminal of the thermostat.
Then, for this
instance of diagnosing the cause of the problem, reconnect the
mindful that the power is now on and taking all precautions
necessary, grab the insulated part of the aforesaid unscrewed
wire and have its un-insulated part touch the R terminal of the
thermostat, and maintain this touching position for about
minutes. If during that time the compressor kicks in, this
means the thermostat is bad and must be replaced. A
thermostat replacement can be purchased from any home
improvement store, appliance store or online.
the compressor of the air conditioner does not kick in during
that approximate three-minute period when the two aforesaid
wires are touching each other as noted above, then your air
conditioner is in need of specialized repair.
power to your air conditioner again.
manufacturer's instruction manual for repair options and, if
need be, contact a repair technician specializing in central air
Handyman Zone Team
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