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Replaced capacitor on fan in air handler now condenser will not run and fan on air handler will not shut off

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  • Gibson Master
  • 1,363 Answers

Fan relay stuck in & control fuse might be blown. see if you have 24 volts at outside unit.

Posted on Aug 13, 2015

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Posted on Jan 02, 2017

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SOURCE: Carrier air handler tonnage?

That is a fairly large difference. It is usually ok to have the inside evap. coil and blower up to 1 ton larger than the outside condenser. That will make the unit slightly more efficient as well as less likely to freeze up on low airflow situations. It is not recommended to install a new condenser on an old evap coil. There has been a lot of changes to the design of the coils in the last little while. For example a 10 year old 2 ton coil may only have 3 cubic feet of volume but a new 2 ton coil may have 4 cubit feet of volume.

There are many factors that may have infulenced the decision on what size condenser to install. Many of which can only be done by visiting the home and doing alot of work, checking the duct sizing bioth supply and return, inspecting the insulation and windows of the home etc. etc. Most of the time that never gets done. You can blame the contractor for not doing a complete check, but at the same time you can blame the customer because many contractors that are that good loose the job to a cheaper bid that did not no any of the research. It is a catch 22 for everyone involved.

There is ALOT more to sizing equipment that many people think, sadly that also includes many HVAC contractors. Way too many people use "rule of thumbs" or flat out "guess".

Sorry for the rant but your queston can only be answered by a good well educated HVAC contractor visiting your home. That type of a contractor is getting hard to find these days in such a price competetive world.

Posted on Oct 14, 2008

  • 306 Answers

SOURCE: the air handler won't shut off

As long as the t-stat fan switch is in the auto position the problem sounds like fan relay is stuck. It looks like a little black box about 2 inches square. Has 5 positions on it two of them are for 24 volts.
Be sure you turn off power before pulling it out. Make note of the arrangement of the wires maybe label as you remove them. ken

Posted on Dec 27, 2008

  • 1 Answer

SOURCE: Rheem Air Handler will not run

We tried to bypass at the Tstat. Thanks for your time and interest.

Posted on Apr 12, 2009

  • 37 Answers

SOURCE: Trane air handler model #TWV036B140A Fan wont stop

Sounds like you have a bad fan relay, the fan should shut of within 30 to 120 seconds after t-stat is satsified.

Posted on Apr 25, 2009

relaga58
  • 158 Answers

SOURCE: Condenser fan shuts off soon after start

yes

Posted on Jul 02, 2009

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1 Answer

How do I fix my Trane air handler to keep it from turning off about 20 seconds after being commanded to turn on?


Some units require both a start and a run capacitor. It's possible the wrong capacitor was replaced. It's also possible to add a run capacitor to a system to keep the fan running. There is an outside chance the bearings in the fan motor are worn to the point it's time to replace the motor.

Mar 29, 2015 | Heating & Cooling

1 Answer

Air conditioner fan is blowing but not air coming


If you mean that your OUTDOOR AIR CONDITIONER FAN MOTOR is blowing AND no air is coming out of the vents within your house, it clearly indicates to me that 1 of 2 things are wrong.

Either (1) your INDOOR AIR HANDLER is NOT running or (2) the INDOOR AIR HANDLER is running but your PLENUM has come apart.

If your INDOOR AIR HANDLER UNIT is NOT running, it could simply be the circuit breaker is OFF/TRIPPED and simply needs to be turned OFF; then turned ON. If that does not FIX your problem, then it is most likely your 5 micro-farad run capacitor for your indoor fan motor needs to be replaced. It will prevent your indoor fan motor from energizing. Worst case scenario would be your INDOOR FAN MOTOR has windings burnt and needs to be replaced. If your indoor air handling unit is equipped with a CONDENSATE VALVE CUT-OFF SWITCH, check to see if your drain pan is filled, thus energizing the switch. If the CONDENSATE VALVE CUT-OFF SWITCH is ENERGIZED, it will prevent the AIR HANDLER FROM energizing. That is the design and the reason for this valve.

Good luck.

Aug 26, 2014 | Heating & Cooling

1 Answer

Goodman compressor not running after power outage


no reset replace capacitors. check terminals on compressor to see if a wire burned off

Jul 31, 2012 | Goodman Heating & Cooling

1 Answer

Were is the reset button on the unit?


Hi, here is the theory on the reset button on Air Conditioners. They reset via the breaker panel box in your house. Check that first before anything else. However if your unit is popping breakers, it is because the rating for the breaker is incorrect, or there is something that needs servicing usually in the outside unit called the condenser. That piece contains the compressor. A faulty compressor and pop the breaker. Or If the condenser fan that blows over the coils of the outside unit stops (common failure) The compressor will overheat and shut down. That may not trip the breaker but the house will get hot anyway. Usual action for this is to replace the condenser fan motor and starting capacitor. Make sure the speed rating and directional rotation for the replacement motor is the same as the motor removed.
There are other reasons why the system won't come one fully. If the wall thermostat is digital and does nothing. including turning on the fan. There will be a small fuse located on the circuit board of the air handler (part of Air Conditioner mounted inside the house. It houses the circulation fan). That fuse could be blown. That one shuts down just about everything.
On air handlers mounted up into the attic crawl space there is an overflow pan. This pan is mounted directly below the air handler. This pan can fill with water when the drain pain contained inside the air handler starts to overflow because the drain system to that is clogged.
There is a "float switch" mounted in the overflow pan wired to the system in such as way as to shut down the entire AC system if that pan fills.
The handling is to clear the obstruction in the Drip Pan inside the air handler. Then remove enough water from the overflow pan and the AC will run as though nothing has happened.
If you have more questions, write to me on this site.
One thing more. The capacitor alone in the Outside condenser unit can fail and that will stop the condenser completely if it is of a "split" design and used for both the compressor and fan. When replacing this unit alone, ALWAYS find the same specification part.
I hope this helps,
Have a Happy New Year,
Mark

Jan 02, 2011 | Goodman CLJ30AR32 Air Conditioner

1 Answer

Fan works but condenser does not kick on


You air handler and condensor run off of two seperate circuit breakers. They share the same control voltage source. With the air handler responding to the thermostat setting, we know you have control voltage. You either have a problem with the line voltage at your condensor or something is happening in the control. Check your circuit breakers and/or fuses to your outdoor unit. Also, look for a red button near the area where the refrigeration pipes enter your condensing unit. Push the red button. If it starts to run, your unit went out on High Head Pressure. A dirty air filter this time of year can cause head pressure problems in the heat cycle (assuming this is a heat pump). Also check for cleanliness of the condensor coil and ensure proper operation of the outdoor fan motor.
There are a couple of components inside the condensor that could prevent it from running. One is the contactor. If the contacts are pitted or if a bug crawled in between them, it will prevent the unit from running. Another component is the Dual Run Capacitor. If this fails, it could prevent operation of your outdoor fan and compressor. Don't forget to check all your wires and connections. Always shut off all power prior to reaching into the electrical compartment.
I hope you find this to be very helpful moving forward. :-)
Testing Run Capacitors

Failed Compressor Contactor



Apr 03, 2010 | Ruud Central System Air Conditioner

1 Answer

Whirlpool central ac stopped blowing air, cool or fan only. compressor outside running and attic unit on but no air. Solution??


If you are refering to the indoor fan that is not running, but that the outdoor condenser is operating, the next place to check is the circuit board in the air handler, this is the control for the fan motor. the relay may be bad that actuates the fan circuit. if the relay is bad there will be no power to the fan motor. If you have power to the fan motor then the motor is bad and the motor and capacitor should be replaced.

Jul 20, 2009 | Heating & Cooling

2 Answers

Fan quits and the compressor still runs


is this a split residential system. it sounds like you are talking about the condenser fan either way it seems like the fan is overamping and tripping on thermal overload which is a device in the motor that protects itself. when you shut it off for a while and turn it back on does the fan work. if you turn it off then turn it right back on does the fan work. when it shuts off is the motor really hot. if possible, and you know how, check amp draw. typically you can find the rated amp draw on the motor nameplate.

May 27, 2009 | Carrier 52CQ315 Air Conditioner

1 Answer

Rheem Air Handler will not run. This is a 2006 Rheem model RHLA-HM3617JA Air Handler. I replaced both the condenser and air handler circuit boards. I replaced the motor in the air handler.. The condenser...


Have you hard wired your fan motor to verify that the motor and or the capacitor are good? If you do a continuity test of the motor leads(with electricity off of course) you can see if the motor has open or grounded windings.

Apr 11, 2009 | Ruud Handler Air Conditioner

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