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Have a carrier heat unit model#48kha048300bf replaced the evaporator fan motor.heat will come on but fan won't come on automatically.responds to thermostat in "on" position but not in "auto"

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Thermostat control

  • The thermostat on a window air conditioner works by sensing the air temperature entering the air conditioner. As the air entering the unit reaches the set temperature it will cause the compressor to turn off. The blower may continue to run depending on the selection chosen on the control panel. Digital thermostats work on a similar principle but display a more precise temperature.

Posted on Dec 15, 2008

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The fan control is the problem and will need to be replaced. First you should check for voltage at the fan. Also will it work manually? If so, then the cheaper option would be to run it manually for now if you don't want to replace the control unit. Let me know what you find. A volt meter can be bought from Radio Shack if you don't have one.

Please post any other questions you may have

Posted on Dec 15, 2008

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Posted on Dec 15, 2008

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Posted on Jan 02, 2017

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1 Answer

I have a carrier ac moddal 38HKC48DS3002 4 ton that will run for about 10 mintes before off the coppreser and than displing show E4


If unit displays "e4"

1? Check whether the winding resistance and
operation current of the compressor are normal.
2?Check whether the high and low pressure is normal
when the unit is running.
3?Check (whether the coil pipe sensor is normal)
whether the contact of the inserter on the circuit
board is well, the coil pipe temperature sensor is
fixed, the evaporation of the indoor unit is well,
the key is to check the evaporator temperature
detected by the coil pipe temperature sensor has
reached the cooling or heating temperature.
4?Check whether the surface of the condenser is too
dirty, it should be cleaned when it is too dirty.
5?Check whether the capacitance of the outdoor motor
and the fan is damaged, it should be replaced when
it is damaged.
6?If the above items are normal, the electric control
board should be replaced.

Air Condition Fort lauderdale

Apr 12, 2015 | Carrier Heating & Cooling

1 Answer

When the heater is on, should the fan outside on top of the unit also be working along with the blower from the heater ? When the heater is off, cold air is comming from the vent's, can I cover the


No. This is strictly a gas package unit, not a heat pump. the condenser fan motor should NOT run when their is a call for heat from the thermostat. The condenser fan only runs with the compressor on a call for cooling. Hopefully the compressor is not running @ the same time, but if it is, it would make sense that the contactor for the compressor & condenser fan motor is stuck closed OR the low voltage cooling wires are shorted straight to a 24Volt control wire.

Jan 15, 2015 | Carrier Heating & Cooling

1 Answer

Need the motor size on a carrier 38SQ940311


Carriers usually have a 1/4 HP condenser fan motor.

Jul 19, 2012 | Carrier Heating & Cooling

2 Answers

Carrier oil furnace model 58BMA155-20(FORCED HOT AIR)i had changed the blower motor & honeywell st9103a128 fan control board.now the blower motor won't shut off until the breaker is turned off.i...


You need to check the wiring to the limits and safety devices with are in a number of locations, make sure all connections are tight.The most common cause for the blower to run is the high limit device which is the one mounted above the burners on the flat metal panel with two wires.

Nov 03, 2011 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

My a/c unit has quit working at home. The Model Number is BRCQ0361BD. When I turn the a/c on, the unit will hum, but the fan won't come on. Sometimes IF the fan does come on, it only stays on for a few...


Hi,
Sounds like you need to replace your evaporator blower motor capasiter, it is located on the houseing of your blower motor, easy to do , but be carfull, they hold a charge and can shock you.
remove the two wires and replace like for like, check operation. If problem still exists, you need to replace the blower motor.
This should help.

Jun 29, 2011 | Heating & Cooling

1 Answer

My fan motor on a carrier 38ycc024310 has been changed two times should i replace the heat pump or is there an electrical problem


Most Carrier units use smaller horsepower motors with less rpm.
If a universal motor was used that may be your problem.
Check the specs listed on the unit and replace with the correct motor.
Also replace the capacitor.

Dec 18, 2010 | Carrier 38CKC042 Air Conditioner

1 Answer

Fan motor runs backwards


Make sure the capacitor is connected to the start lead, not the run lead(s). Also some fans come with some wires you can switch to reverse the direction. If your motor has them there will be 4 and the label on the motor will tell you how to connect them. Let me know if you need more assistance or if this helps.

Jun 02, 2010 | Carrier 38CKC042 Air Conditioner

2 Answers

Fan on Carrier roof top ac makes loud noise on auto or high but not on low


this one is carrier AC with bad blower motor. Hope This Helps.

Sep 29, 2009 | Heating & Cooling

2 Answers

Carrier home ac system


sounds like your contactor is stuck closed.This is the part that high voltage connects to and lets power through to the compressor and condenser fan motor when you get a call for cooling.If you go to pull it out,kill the power outside AND at the furnace.

Aug 12, 2008 | Carrier Heating & Cooling

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