Outside Unit blowing air but not cooling and slight buzzing sound
Hello, my power company recently installed a load mgmt switch on my outdoor HVAC unit to cycle the compressor during hot summer months. The unit is not cooling now, though. It is blowing air through the house fine, but the air from the outdoor unit is cool. Whereas the air blowing from the other unit is warm. The unit is making a buzzing sound, too. Any ideas on what is happening?
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Re: Outside Unit blowing air but not cooling and slight...
The compressor is not coming on and some part of that unit has failed. Do you hear any clicking sounds along with the buzzing sound? Recommend that you shut the unit down (remove power from it) until a service tech can listen to it try to start up.
The power company-installed load management system is probably a red hearing. That system will either fully turn off the unit or allow it to turn on/start up.
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I know what you mean. Not a lot of companies around here care to work on mobile homes. There is a safety on that unit that may or may not be a reset. Normally it will have a small red peg in the center to push and reset. Some don't have a reset though. Look for a small, flat safety, it should have 2 wires. And it may be hidden. As if 2 wires just disappear behind the blower assembly. Check for voltage to it, and across it. You can find volt/ohm meters for $10. Chase or follow the signal from the tstat. R comes from the tformer and powers the tstat. Tstat closes and sends a 24v signal through Y and G in cooling. Y should go from tstat to indoor unit, and to a terminal block or wire but, then directly outside to outdoor unit. G comes from the tstat to a terminal block's (g), then to the auto,off,on, then to a switching relay's coil. This coil closes and allows line voltage to pass through powering up the fan. So at the indoor, with 1 lead connected to common with your voltmeter set to AC volts, use the other lead to follow these paths. Or keep calling companies to find someone who will work on them. Electricians will not work on HVAC equipment. Even though it's all the same principal, source/line/load. Be safe!
I did some research and this sounds like it could be a capacitor issue. Go to the back of your outside unit and look inside the access panel with the electrical warning sticker on it, if the capacitor is bowed up at the top, it needs to be replaced. If it turns out to be the capacitor, follow this link for a new capacitor replacement kit, it will save you hundreds of more dollars than calling an HVAC repair company to charge you an arm and a leg. The kit also comes with the proper tools and parts needed as well as detailed instructions on how to replace the part yourself. http://hvacrepairkits.com/index.php/content/article/68 I hope this helps!
If the fan is not running is the compressor not running also...if neither is running the possible reasons are 1..no power to outside unit...2..bad contactor on outside unit.is this buzzing if it is this indicates no power...3 bad capacitor,do both compressor and fan humm then quit humming and hum some more...4 high pressure switch has shut unit down because fan wasnt running if compressor was running but not fan....if your unit has this there will be a manual reset button where the lines come out of unit...if compressor was running and fan was not...1 bad fan...2 bad capacitor.. if you do not have any electrical knowhow i would recommend calling a hvac tech to come and fix unit...Thanks
Hello. Sounds like you do have power. That spring loaded plastic switch is a 24v contactor. It pulls in when energized. If you push it in manually everything shoud run normal. Ck your 24v transformer. On one side (feed) you should have 115v or 220v depending on what kind of transformer is used likely (115v). Coming out of the transformer you should have 24v. If not you need a new transformer. You will need a mutimeter for this. If you know you have power where the wires are connected then you know how to use a mutimeter. Only way to know for sure outside of manually pushing in the contactor. Good luck. Be sure to kill the power before making repairs.
Find a reputable HVAC contractor to do a
room by room analysis with heat and cooling loads calculated and units
sized and duct requirements and compare to what you have.
The air not being cold is not necessarily an indicator of anything
malfunctioning. High efficiency units for instance don't produce cold
Since you have had someone look at it, the duct
work may be collapsed which restricts air flow or uninsulated which
warms up the supply air. Either one is a possibility. Any Cox Cable guys
been stompin' around your attic lately? Wouldn't be the first time.
Usually, when the air coming out of the vents is not cold enuf it's because your freon level is low. Probably leaking, but they can usually recharge the freon and it will work for a while. Try another repair company and see if they can recheck the freon level.
We have a high efficiency unit and it produces cold air, so I don't know what previous poster is referring to. Air conditioners are supposed to blow cold air.
Sorry, to tell ya but it is normal if the outdoor temperatures are much
below 45 degrees. Below 45 degrees there is little heat outdoors for the
heat pump to grab to heat the home so it will run 24/7 and blow cool or
cold air. Below 45 the temp of the air coming out the vent will decline
and you will get no heat from the heat pump itself as you near
Your emergency heat or auxiliary heat is electric strip heat. But it
only kicks in during normal operation if the temp in the house drops 3
degrees below the setting. (some tstats if can be 5 deg.) Otherwise the
heat pump will blow cool or cold air the rest of the time if it is too
To prevent it from running all the time and blowing cold it is
recommended if the temp outside is falling below 45 degrees you should
just switch to the emergency heat setting, which shuts the pump outdoors
off, and just heat with the electric.
But if there is no heat outside the heat pumps will blow cold. They are
the cheapest and most efficient forms of heat but only as long as the
outdoor temp is above that 45 deg..
I'm guessing that if you haven't experienced this you live in some place
with moderate winter temperatures like in Northern Florida and rarely
get very cold winter temps like the freezing you have seen there
It will likely blow much warmer when the outdoor temp rises.
It's a 24v transformer. Your indoor unit houses the transformer for the outdoor unit. The outdoor has a low voltage (24v) supply running to it to push in the contactor for the outdoor unit to run. If your air handler inside has no power then it will kill your LOW VOLTAGE power to the outdoor unit. You will still have the high voltage power to the outdoor unit. You may have a fuse on the switch for your air handler blown if there is one. On the disconnect switch mounted to your air handler, you will have a door to open and a fuse in there. If not, check your main breaker at the panel. If you don't know what a transformer looks like, you may want to have someone familiar with electrical of HVAC help you. To check the transformer for power, you first need power to your air handler, which you don't have. I would say that is not your problem. I would assume your air conditioner is not running outside, correct? Your problem is the power (HIGH VOLTAGE) to your air handler. Loose wires, blown fuse, tripped breaker etc...
Is the outside unit running? if so can you feel warmer than outside air blowing from outside fan? If not your system may have a leak and pressures low. You can also check the piping to and from the unit larger one should be cold small one should be warm
It sounds like you have a unit called a heat pump. When a heat pump unit is in cooling mode the outside unit blows hot air and the inside unit blows cold air. If the outside unit is blowing cold then the indoor unit is most likely blowing room temperature or warm air. It sounds like the thermostat could be controlling incorrectly or you could have a failed reversing valve which is the device that switches the unit from heating to cooling mode.
The buzzing noise sounds like the contactor is energizing and if it is then you need to check to see if you have power 230 volts to the outdoor unit, if not, check the fuses or breaker, if you do have power then you may have a broken or burnt wire inside the outdoor unit.