Outdoor Unit Makes Strange/Loud Noises
pumps do make strange loud noises especially
in the wintertime. It's just the nature of the
beast. i.e., heat pumps have reversing
valves that reverse (or shifts) the flow of refrigeration
between the heating and cooling modes. This occurs
every time the unit goes into the "defrost cycle".
When this shifting occurs, there is a loud "swooshing"
sound, which usually lasts for several seconds.
The "swooshing" sound is sometimes followed by
a somewhat louder than normal compressor noise
as it shuts down to allow the refrigerant pressures
to equalize. All these noises are perfectly normal.
Another common sound is present whenever the
outside condenser turns "off" or "on". For a few
seconds it sounds like an out of balance washing
Sometimes customers note a "buzzing" sound from
the outdoor unit. even when it's not running.
This is usually the reversing valve's solenoid
coil. It's low voltage (only 24 volts) so it's
really not wasting energy.
If you hear a metal to metal sound or a persistent
"thumping" sound, check the fan blade of the compressor
to see if the blade can be hitting something (ice,
wire, twig). Shut the unit off, immediately
as this not only will ruin the fan blade by throwing
it "out of balance" but if allowed to persist,
ruin the fan motor as well.
And there is always "vibration" noise. Sometimes
its only a matter of installing (or replacing)
isolation pads. Sometimes the refrigerant lines
are strapped too tight. Sometimes it is the unit
itself and cannot be eliminated.
Below is a list of possible causes. Items in
blue can be addressed
Or fixed by the homeowner. Those in red
usually require a service call.
Hope this has been of some assistance, however
they are just rough guidelines and not all possible
conditions are covered.
unit iced up-weather related
blades hitting some obstruction
due to out of balanced fan blade
due to loose parts
due to piping strapped too tight
refrigerant charge (gurgling noise)
reversing valve-makes hissing sound
of balanced or bent fan blades
contactor or solenoid coil
company You Choose To Install and Service
Your System Will Determine The Degree of Comfort
and Satisfaction You Enjoy.
Excerpts of the preceding information has been
compiled by Hannabery
HVAC, which has graciously permitted us to
include them on this web site as a service for
"Common HVAC Problems" are provided FREE and as
a consequence Climatemakers does not assume any
liability resulting from any information we provide.
In all cases where there is any possibility of
injury, consequential damage, direct damage to
your equipment or when recommended by the equipment
manufacturer, your system should be repaired ,
inspected or maintained by a qualified technician.
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