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Unit makes noise, but no air is coming out of vents

Between last night and this morning, my A/C quite working. When I lower the temp on the thermostat, I can hear noise coming from unit in attic and the unit outside runs, yet no air is coming through vents. I checked the ducts and it all seems connected. While in the attic, the unit makes a hissing sound, like you would hear letting air out of a tank, but nothing else engages. Is there a pilot or something? I need help, its very hot out!!

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  • Sqweezinby Jun 22, 2009

    okay, I checked for icing and found none. The ac unit outside is functioning normally and doesnt seem to have a clog in lines. I also changed the filter today. When i switch the thermostat to fan and cool, you can hear the furnace in attic engage, but doesn't blow air. So the blower motor is not working? Easy fix? Maybe a relay or some switch is faulty? Any way to reset the furnace at the furnace behind the panel?

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Check the unit in attic for iced up and outdoor unit you may notice ice on lines or connecting tubing and in attic also-------- if so turn unit off at thermostat and leave fan switch on the thermostat to on while sytem switch is off
should be nothing running but the indoor fan
will have to thaw if it is iced up for a while couple hrs. a guess
you will know when it is thawed as your airflow will begin to come back

check your air filter to be sure it is clean
suggestion only-- keep your house thermostat set at 70 degrees or above
you may have developed a refrigerant leak (freon) which would require a hvac service tech to verify.
if it was iced you can turn all back on and try again once you have good airflow again.
or if your system has not been serviced lately? might be a good time to have it serviced?

Posted on Jun 21, 2009

  • panilling9
    panilling9 Jun 22, 2009

    pull the cover off the unit to access the fan may need some common tools could be a reset on the fan but most of the time they are internally protected

    turn the switch or breaker off before you check things

    try to turn the motor by hand is it free wheeling?

    check the motor is it hot to the touch?

    check the capacitor it mounts on the blower housing near the motor with a capacitor tester or ohm meter be sure power is off and remove capacitors 2 wires? check with a meter for shorted cap. constant(ohms) when testing across its terminals. to check open cap. you would need a tester or a good analog meter.

    deflection and come back to zero says its not open only not the capacitance

    check power coming in to the heater a/c blower with a meter to see if you have it to the motor?

    if you have a heater emergency switch be sure it is on....

    if you dont have power to motor for check wires back to the fan relay for power

    check for loose or broken wires in this area also

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