Noisy compressor at start and end of defrost cycle
Goodman GSZ130241A / ARUF182416 The Goodman unit now sounds like this during the defrost cycle: http://www.youtube.com/watch?v=9gfnmVB5q3c&NR=1 The unit ran reasonably quiet for several months (installed Nov 2008) with just a very short clang at start.
New HVAC tech had a quick look at unit and is returning in a day or so when he has more time to remove refrigerant as a start in diagnosing problem. Here is what he found: 40 F outdoor ambient - 73 F indoor Hi PR 410 / Lo PR 96 Discharge temp 158
Air handler tested w/ actual measured voltage/current: Hi speed: 19 F temp rise = 947 CFM Mid speed: 21 F temp rise = 856 CFM
Unit was originally charged by weight (6 oz added) by different tech who said unit was installed correctly. They state that this is ''normal'' noise.
Could the factory overcharge (if that is the case) or other malfunction creating high pressures cause permanent damage to scroll resulting in this noise?
The unit heated (and defrosted) very good and the original noise levels were better than a neighbors unit. I was very pleased with it until it started making this noise.
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Seems like it trying to start and then cuts out , possibly on overload. Try the machine on fan blow only , that will check the indoor unit to see if that is working. Then try cool or heat function while listening to the machine starting. If you hear a loud humming just as the fan starts, and then it cuts out, It could be a compressor issue. Possibly the start capacitor has failed.
Good Afternoon John, thank you for your post! Your new high-efficiency refrigerator may make
unfamiliar sounds. These are all normal sounds and soon will become a common
hum in your home. This noise also indicates your refrigerator is operating as
designed. Hard surfaces, such as vinyl or wood floors, walls, and kitchen
cabinets may make sounds more noticeable.
Listed below are descriptions
of some of the most common sounds you may hear, and what is causing them:
A. Evaporator: The flow of
refrigerant through the evaporator may create a boiling or gurgling sound.
B. Evaporator Fan: You may hear
air being forced through the refrigerator by the evaporator fan.
C. Defrost Heater: During
defrost cycles, water dripping onto the defrost heater may cause a hissing or
sizzling sound. After defrosting, a popping sound may occur.
D. Automatic Ice Maker: If your
refrigerator is equipped with an automatic ice maker, you will hear ice cubes
falling into the ice bin.
E. Cold Control & Defrost
Timer or Automatic Defrost Control: These parts can produce a snapping or
clicking sound when turning the refrigerator on and off. The timer also
produces sounds similar to an electric clock.
F. Condenser Fan: If condenser
coils are located underneath your refrigerator you have a condenser fan. You
may hear air being forced through the condenser by the condenser fan.
G. Compressor: Modern,
high-efficiency compressors operate much faster than older models. The compressor
may have a high-pitched hum or pulsating sound.
H. Water Valve: If your
refrigerator is equipped with an automatic ice maker, you will hear a buzzing
sound as the water valve opens to fill the ice maker during each cycle.
I. Drain Pan (Non-removable): You
may hear water running into the drain pan during the defrost cycle. The drain
pan will be located on top of the compressor for air-cooled condensers (black
coils on back of refrigerator).
I do hope this information proves to be helpful. Should you
need any further assistance please feel free to respond.
A couple of possibilities: Coolant level has declined too far; compressor has failed, and finally, the defrost timer has failed.
During the defrost cycle, the compressor is intentionally shut down and if the defrost timer has failed during the defrost cycle, the compressor will not be re-enabled.
You didn't include the model number so the following may not apply:
The defrost timer is often located behind the lower grill of the unit.
Remove the grill (often held by plastic tabs) and look for a small black box with a hole or a short protruding shaft.
These often have a screwdriver slot to allow manual rotation in the event of a timer motor failure.
If you find this, insert a flat-bladed screwdriver and rotate the shaft ~ 1/4 turn and wait to see if the compressor then starts up.
If not, turn the shaft a bit further and wait again.
If the compressor does not start, either the relay that supplies AC to the compressor has failed or the compressor itself.
Without being there to see it and have only your description in front of me, it sounds like the fan blade could be out of balance.......but it sounds more like a loose fan blade hub. Most Goodman units offer a minimum 5 year parts warranty. The Labor warranty is questionable, but the installing contractor or the Goodman Distributor should be able to give you that information. Of course this would cover manufacturer problems and not physical damage. As far as a history of this problem with Goodman..........I've seen it with every brand. If there is a problem getting it under warranty, you might be able to purchase the blade yourself. Before replacing the fan blade, I recommend disconnecting the motor wires from the contactor, tape off the ends and remember exactly where they were attached.....then start the unit to see if the noise is still evident, if so, it's probably your compressor. I recommend a certified repairman....not the one that quoted you $800.00. If you hear only the compressor start up and not the loud noise you are discribing, then try replacing the blade first.
I hope you find this information to be very helpful to you. :-)
Does it make the noise all of the time or just periodically? Does the outdoor fan run when it is making the noise. If the fan isn't running and the compressor is noisy at that time likely it is in defrost mode which is normal.
Your unit is probably operating in defrost mode. When you use a dehumidifier in a cold room, the condensing coils can freeze water. The unit senses this and thus stops the compressor until the water frozen on the coils melts. Then it resumes its cycle. This is a problem you will have during the winter months. It makes the operation of the unit inefficient, but this is otherwise normal behavior.
Is it noisy always when running in heat or only for intermittant periods? Depending on where you live every 45-90 minutes of run time the heat pump goes into a cycle called defrost. The fan on the outdoor unit will shut off. the compressor will continue to run but in actually cool mode. this heats the outdoor coil and allows any frost or ice that is built up on the outdoor coil to melt. The compressor can get pretty loud in this mode and you may actually see steam coming off of the unit. This is normal. However if it is noisy all of time in heat check/clean your coils. If this doesn't remedy it have your refrigerant charge checked by a NATE certified Service Technician. Good luck.