Question about Heating & Cooling
Assuming that the 2 systems are isolated, that there isn't any cross over between the systems...
It is normal for an air conditioner system, from window unit to central, to be able to circulate the air, even if not cooling. This is known as Circ or Fan Only Mode. But, in this mode, the outside unit (condenser) would not be turned on.
Since the condenser for downstairs has its fan blowing, the compressor, as you properly surmised, is not running. There would not be anything in the attic exchange that would affect this, since you are in cooling mode, and not using the furnace.
Some possible reasons for the compressor to not run are: Overload Protection is tripped (burned out), Compressor contactor (high current relay) is not engaging or contacts / coil are open, Wiring between downstairs Thermostat and condenser is damaged (in particular, the wire that activates the contactor). A failed compressor protection (time delay) device will also prevent it from starting / running.
Time to call a service tech.
Posted on Jul 08, 2010
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Posted on Jan 02, 2017
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