Question about Carrier 38BRC048 Air Conditioner

4 Answers

Carrier Air Conditioning

I have to pull the disconnect on my AC since I had a blower fan replaced a couple of months ago. I know one has nothing to do with the other, but when the tech was changing the motor he had to remove the mother board to access the motor. I wonder if he could have possibly moved one of the dip switch's. There are no codes and the compressor outside will run continuously even when the furnace is on unless I pull the disconnect. I noticed this about a half hour after the tech left. He would not come back unless he could charge a service call even if it was his fault! It should be something simple, it was working fine before except for some blower motor noise.

Posted by on

  • JPE1 May 30, 2008

    Thanks, I have not had a chance to try anything yet. I'll try as soon as I get home. JPE

×

4 Answers

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 5 Answers

Have the tech come back. the problem did not exsist before he pulled the board. He either left his jumper wire connected by misteak or he shorted the wires to get the fan come on so he could check the operation. Either way he created this mess and is responsible. Most service techs would return and fix his problem just out of pride in his work. If this guy will not return then contact the BBB and the licesing board for the state you live in they have an investigative unit just for guys like this. good luck

Posted on Sep 19, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

WE HAD A FOUR ZONE CARRIER COMFORT ZONE SYSTEM INSTALLED IN OUR HOME DURING CONSTUCTION IN 1993. DURING A RECENT THUNDERSTORM THE FAN MOTOR BEGAN TO RUN AND A "HF 41" TROUBLE CODE APPEARED ON THE SCREEN. WHAT DOES IT MEAN? THE HIGHEST ERROR CODE IN THE BOOK IS HF 33. THANKS DON

Posted on Jun 26, 2008

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Contributor
  • 54 Answers

I've never seen a bad control board cause this fault. The condenser is controlled by a relay in the outdoor section which in turn is controlled by a 24v signal from the control board. It's possible the contacts on the relay in the outdoor section are frozen in the closed position- whatever caused the control board failure could have also caused the relay failure but it wouldn't be evident until much later unless the technician looked for that specifically. It's also possible that there was a simple wiring error was made and the relay was connected directly to (C) and (R) on the control board, bypassing the control circuit entirely as foolish a mistake as this would be I think it's at least as likely if not more so than frozen contacts on the relay. I can't imagine any two wires very likely to short and cause this failure other than red and yellow from the control board, possible but I would think unlikely. Simple test- turn power off at the breaker to the indoor section If the out door condenser continues to run Its the compressor relay. If it does not I would investigate the wiring on the control board If the wiring is correct then change out the control board after discovering what caused two control boards to fail.

Posted on May 31, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 1,420 Answers

If the outside unit runs continually, check your thermostat and make sure there is no call for A/C. Inspect what thermostat wiring you can find and look for wires that may be touching together. On the outside unit, remove one of the 24 volt thermostat wires from the control and see if the unit stops running. If it does, you either have a short somewhere or a bad control board in your air handler.

Posted on May 30, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Fan doesn't work in heat mode it works on all other functions. Heat does come out but fan doesn't kick in. Outside unit is operating


AC inside fan doesn't come on AUTO - DoItYourself.com Community Forums

www.doityourself.com > ... > Air Conditioning and Cooling Systems
Jul 21, 2004 - The inside FAN doesn't run when in AUTO mode. If I leave ... Is the thermostat not working correctly or something in the AC unit causing it to do this? Thanx ... The unit is electric central air-conditioning(heat and cool). It made ... Carrier A/C condenser fan not working
Jul 27, 2012
Heater Fan Doesn't Work on AUTO
Jan 23, 2006
Blower doesn't work in ON position after repair
Mar 25, 2005
Central AC/Heat, Blower Doesn't work on Auto
Nov 30, 2004
More results from www.doityourself.com

Nov 01, 2015 | Air Conditioners

1 Answer

The blower in my Ruud gas furnace won't shut off. It just runs and runs. The thermostat is set to "off" and the fan switch is set to "auto". We haven't used the furnace or AC the past few months since we...


I'm not sure what setup your unit has but the fan relay sound like it is bad. If your blower connects to a circuit board then the board could be bad. Different units use different ways to control the fan. Some use a relay like I mentioned. Some use the circuit board (newer units). Some even use a sequencer. The first step will be finding what yours is using. Since you tried disconnecting the green wire from G already and it didn't cut off I would think your thermostat is not the problem. Let me know what you find.

Aug 15, 2010 | Ruud UAKA037 Air Conditioner

2 Answers

Why does my AC keep freezing (Carrier FB4ANF036). I have replaced the blower motor less than a month ago due to the same problem. Just last night we had a lightening storm and shortly after that the AC...


if your system is a heat pump you can switch to heat and see if coil outside gets cold while indoor blows warm air - then switch back to a/c - both coils should not be cold at the same time - low freon pressure / dirty coil / dirty filter / low air flow causes freezing

Sep 22, 2009 | Carrier Air Conditioners

2 Answers

Furnace runs constantly since blower motor was replaced


Sounds like they wired it direct to line voltage , it should run through a sequencer or fan relay to cycle on and off , your seq./relay could be stuck closed to but unlikely being it was just repaired , call the service company back before you do anything they are responsible.

Apr 11, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

2 Answers

Mitsubishi MSH 18NV no heating or cooling


The fact that nothing is coming on indicates that there is possibly a problem with your incomming power supply or wiring to and from the inside evaporator to the outside condenser. If all in good order, suggest you find someone you know who can operate a multimeter and check if there is voltage going to the control board inside the evaporator unit. If there is then almost certainly the control board would need replacement.

Feb 05, 2009 | Mitsubishi MSH09TW Air Conditioner

1 Answer

Ruud central air conditioning and heat system


there is a fan relay in the unit. it is stuck and needs to be replaced

Oct 21, 2008 | Ruud Air Conditioners

Not finding what you are looking for?
Carrier 38BRC048 Air Conditioner Logo

841 people viewed this question

Ask a Question

Usually answered in minutes!

Top Carrier Air Conditioners Experts

Cindy Wells

Level 3 Expert

4761 Answers

yadayada
yadayada

Level 3 Expert

61249 Answers

Lawrence Oravetz

Level 3 Expert

7686 Answers

Are you a Carrier Air Conditioner Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...