Be sure the thermostat is switched to Cool , the
Fan is switched to Auto, and adjusted low enough to be turning on. Be
sure the filter is clean.
(Note: What is outlined below may or may not diagnose
your problem and chances are, even if it does you will need to call
your Service Company for repair. This is
only an outline to help locate and understand what the problem may be.
Repairs done to the air handler should be performed by qualified technicians
only.)
Air Handler Not Running -
Usually if the Air Handler is not running, the Condenser will not be
running. Switch the system off at the thermostat. Reset breaker
or replace fuses if necessary. Switch the system back on. If the breaker
trips or the fuse blows again at this point, call your service company.
Breakers or fuses OK:
Switch system off. Check the condensation drain section. Some A/C systems
have safety devices installed which will help prevent the unit leaking
water if the drain becomes backed up. Most drains are gravity
feed meaning as moisture is removed from the air, it collects in the
condensation pan and removed, usually to the outside, by means of a
gradual decline of piping. If the drain system becomes clogged, a float
switch (if installed) will shut it down to prevent leaking. Check for
excessive water build up in the drain pan or auxiliary drain pan. Clean
out the drain pipe and remove the excess water in the pan and restart
the system. On systems with Condensate Pumps, be sure the pump is plugged
in and not clogged. It may need to be serviced by a professional.
If the condenser is running, the fan relay or blower motor/capacitor
could be bad. Again, this will require a service call.
Other areas of fault would be the thermostat or low voltage transformer.
Unless you have a digital thermostat, usually the thing that will go
wrong with it is poor contact because of age or dirt. They are
readily available and fairly easy to install in about 10 minutes.
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