Question about Ruud UBHC Air Conditioner
My outside a/c unit fan stopped working. When I turn it on all I get is a humming sound? could someone tell me what it might be.
By saying the condenser fan is not working as well, I have to ask is
the contactor making any kind of noise?. If the contactor is not making
noise, look for some smaller wires going to the contactor. These are
the low voltage wires that send 24 volts to the contactor. Make sure
the thermostat is turned on, set it for a temperature lower than the
current room temperature. Are you getting voltage to the contactor? If
the answer is no check the W wire at the air handler and at the
thermostat. The G wire runs the inside blower only. This is why you can
put the fan in the ON position and not have the compressor running all
the time. If you are getting voltage at the contactor turn the power
back on at the compressor, take a sturdy insultaded rod, very dry wood
or plastic remember electricity can kill damp wood can conduct
electricity. Look for a small bump in the center of the contactor.
Press it with the rod and see if the compressor turns on. If it turns
on when you press this point on the contactor and off when you release
it then the low voltage side of the the contractor is bad. If the bump
is pulled in and the unit is not running take the multimeter and
carefully check to see if your are getting 240 volts across the two
bottom connections and then 240 volts across the top of the
connections. If you are getting 240 volts on one side only the the
contactor is bad and you need a new one. Turn off ALL POWER this is the
breakers for both the compressor and the furnace. Again make sure the
power is off. Make a diagram of the wire positions, then disconnect
them. Remove the contactor and take it to an electrical supplier or an
HVAC parts supplier and get a new one. Reinstall it and reconnect the
wires. Turn the power back on and everything should be working again.
Posted on Jun 15, 2009
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Posted on Jan 02, 2017
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