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Furnace runs inside but the compressor just humms

This is only 4 years all wires and fuses look good.

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Compressor maybe locked up? may haft to reverse polarity to unlock!! check with manufacturer for same scenarios! good luck!!

Posted on Jun 21, 2009

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Posted on Jan 02, 2017

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Tempstar Air Conditioner wont come on


Sounds like you need a new contactor in the condenser. The low voltage is grounded. Remove the low voltage (likely 2 wires) at the condenser and wire nut the wires leading inside. With an insulated screwdriver manually push in the contactor and be sure both compressor and fan run. Then replace fuse and turn power on to air handler with a call for cooling. Obviously the outdoor unit won't run because you unhooked the low voltage but if fuse doesn't trip then it's likely the contactor. Good Luck

Apr 10, 2017 | Heating & Cooling

1 Answer

I have a Haier air conditioner model HWR10XC6. It's been in storage since last fall, and I put it in our window this morning. I plugged it in, and the light on the panel came on for a split second,...


First check if the fan is running. If the fan is notrunning is the compressor not running also, if neither is running the possiblereasons are 1, no power to outside unit, 2.bad contactor on outside unit, isthis buzzing if it is this indicates no power, 3 bad capacitor, do bothcompressor and fan humm then quit humming and hum some more, 4 high pressure switchhas shut unit down because fan wasn't running if compressor was running but notfan, if your unit has this there will be a manual reset button where the lines come out ofunit. If compressor was running and fan was not, 1 bad fan or 2 bad capacitor. Please check these followings: 1. Thermostat checks i) Is thesystem selector switch in the "Cool" position?
ii) Is the temperature set at least 3 degrees below current room temperature?
iii) If your thermostat is electronic, are the batteries charged?
iv) Some forced-air furnaces have a switch on the thermostat that allows you toturn the fan on independently of the furnace or air conditioner. This switchwill be marked "ON" and "AUTO". Does your thermostat havesuch a switch?
v) If the answer to the above is Yes, listen for the furnace fan coming on. Ifyou cannot hear the fan, go to one of the supply registers and see if you canfeel any air coming up. Is the furnace fan operating?

If everything seemsfine with the thermostat, the next step is to make sure there is power going tothe furnace.

2. Electrical checks

(A) Items to check at the furnace
i) Your systemmay be equipped with an emergency shut-off switch for the furnace. If so, makesure it is turned ON. In most homes, the emergency shut-off switch looks justlike a regular light switch and will be located close to the furnace. (Tracethe wire from the switch to the furnace to make sure you have the right switch.)It is quite common for this switch to be turned off accidentally. If the switchis ON, but the fan still doesn't operate, proceed to the Items to check at theelectrical panel.
ii) Some heating systems also have emergency cut-out switches that are activatedwhen a door or service panel is removed. Often the furnace door is not replacedproperly after a filter cleaning and the cut-out switch will prevent thefurnace from coming on. Check to make sure all access doors are properlysecured and fitted. (B) Items tocheck at the electrical panel i) Thebreakers for the air conditioner and the furnace should be in the"ON" position. If a breaker has been tripped, it will be in aposition between ON and OFF. To reset, turn the breaker all the way off and thenback on. If you have fuses instead, make sure the fuse hasn't blown. If it has,replace it with the same-d fuse. If you havedetermined that there is power to the furnace but you are still not getting anyheat, select your heating fuel type from the list below and continue with thechecks. If you have discovered that the furnace is not getting any power, callyour service contractor. (C) Items tocheck at the air conditioner i) Somecentral air conditioners are installed with a switch, or electrical disconnect,mounted outside to turn off the main power to the unit. Whether or not you havesuch a switch will depend on the electrical code in your area. If you have adisconnect switch, check to make sure it is in the ON position.
ii) Is the fan running on the unit outside? (If the fan is running, you havepower to the unit.)
iii) Some air conditioners will make a little buzzing sound, even when they arenot running. Have you ever noticed this before? Can you hear it now? Summary: Ifyou have determined that there is power to both the furnace and air conditionerbut you are still not getting any cool air, continue with the checks in thisguide. If either the furnace or air conditioner does not have power, call yourservice contractor. (D) Icechecks i) Is thereice building up on the pipes connecting the furnace to the air conditioningunit outside?
ii)Touch the plenum (this is the sheet metal box that comes off of the furnace;the evaporator coil is inside). Does it feel very cold? If it does, theevaporator coil may be frozen and you'll need to call for service Hope this will help you. Good Luck.

Jul 15, 2011 | Haier hwr10xc6 Air Conditioner

1 Answer

We have a 6 year old air conditioner Byrant 591B. The outside unit is not working it make a slight hum when the thermostat is set to cool, but the fan does not run. The furnace is working fine


You picked the wrong picture...lol. You have a split system and that humm you hear comes from the contactor. That means the thermostat is asking the compressor which is outside to come on. If you hear the humm but nothing is working, Check the breaker and then replace the fuses in your fuse box by the condensing unit, or the outside unit if the breakers are OK. It should have a disconnect between 3 to 10 feet of the unit depending on your codes and city requirements. No matter what, if you stand at your unit and look at the conduit, it will lead to your electrical disconnect. It could be a sub-breaker or fuses. It is usually fuses because a breaker could take up to 6 sin waves to respond as where a fuse could take only 2 sin waves. Replace both fuses. As time goes on, fuses become warn from constant load changes and heat and sooner a latter, they just wear out like any other component. Change the fuses and fire your unit back up. If it pops the new breakers, you have other issues and it's time to call an HVAC guys.

Sep 28, 2010 | Bryant 462AJC021BA Air Conditioner

1 Answer

When i turn the a/c on the inside furnace motor runs but the outside compressor units does not. the compressor is a janitrol, about 20 years old


Does the outdoor fan run? If not then start by checking for tripped circuit breakers or blown fuses. If you have power then check the capacitor. If that is good then check your contactor for the fan and compressor. If that is good then check the compressor motor windings. Let me know if you have any questions.

Jun 14, 2010 | Weather King 10AJA3001AH Air Conditioner

1 Answer

Lennox electric furnace wont cool house. model cb-30m-46. dual zone. honeywell control panel. cool light lit and purge light flashing.


check the outside unit (condenser) see if the fan and compressor are running. the compressor humms and you should be able to hear it. if it is running check the inside unit's coil to see if it is frozen or dirty. if it is frozen or extremely dirty then you have restricted airflow to the inside unit. Sometimes checking the coil is near impossible, i use an inspection mirror and headlight flashlight, then i wedge a chisel under the front of the drainpan (CAREFULLY! its plastic usually) so i can get my mirror in there and see whats up. On a furnace the coil will be on the very top and have 2 copper pipes running into it with one of them being insulated. hey also a dirty filter or prefilter can cause freezing.

Oct 09, 2009 | Heating & Cooling

1 Answer

1994 Carrier 58 PAV


sounds like the relay for the unit may be bad, usually if a blower motor goes it stops or has a very loud humm and only goes slow

Aug 03, 2009 | Heating & Cooling

1 Answer

A/C blows fuse on call for 2nd stage.


my guess would be a problem with the low voltage wiring a short have it checked out by an electrician

Jun 21, 2009 | Goodman Heating & Cooling

1 Answer

My honey well thermostat keep clicking and I can't program it


If you have a programmable thermostat and it is a couple of years old you will probably have to install a new one. What kind of thermostat do you have? You can turn power off to furnace and then take thermostat off wall and take wires marked r & w and connect them together your heat should come on when you turn power back on. If not you could have blown the 5 amp fuse inside furnace. I would check the fuse inside of furnace. If you take panels off front of furnace you should find a controll board inside that runs furnace.If you have anymore question just reply back to me

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on the passenger side inside the wheel well there is a high current relay for the air compressor it is a silver metal relay assy 4 wire plug two smaller wire are the relay power two larger wires are compressor feed. if you jump the two larger wires and the compressor works check the smaller wires for power and ground if ok the relay is bad. usually these relays go bad due to compressor drawing high current and usually need to be replaced

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1 Answer

Condesor pump and fan


yes dual feed capacitor in the condensor sounds bad. common to one side and outlet to compressor on the other and outlet to the fan on the third set of terminals. it should test bad but look carefully at it, it may be bloated up like a dead fish and easy to observe if you look at it closely. if bloated bad, worth a try anyway, cheap part ,usually under 40 bucks for most. label wires and reoplace wire for wire exactly with exact voltage and mf ratings. usually a motor shop has em. good luck.

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