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When the heater is on the outside ac unit runs I've temporarily turned off 220 breaker low voltage pull in switch still energized how does the furnace control board fault occur

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Are you sure this is not a heat pump. The outdide unit is supposed to run with a heat pump. If its blowing cool air its likely in defrost mode, this has to happen, though you probably have heat strips inside, possibly not wired right.

Posted on Dec 18, 2016

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How do I get my AC running again? Ruud UBHC AC unit isn't running. Started yesterday or today.


Sounds like there is no control voltage. Either the transformer to reduce the voltage from 110 volts to 24 volts is not producing the 24 volts needed for control voltage, or most furnaces have a small 3 or 5 amp fuse mounted on the main control circuit board that may be blown. Other "outside circumstances" may involve a break in the thermostat wire...more than likely the red wire if you are getting nothing to work. I have seen evidence of "critters" that have chewed through the low voltage thermostat wiring that would keep the thermostat from controlling anything. To check this, go to the furnace and jumper the red & green wire to get the fan running just to isolate if it is a thermostat wiring severred. Good Luck.

Dec 11, 2014 | Ruud UBHC Air Conditioner

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Heater check out list for heater failures


Almost all furnaces built after 1978 have intermittant type pilots.
Ca banned them requiring electronic spark or hot surface ignitors, followed by induced draft motors, pressure switches or centrifigal switches that "prove" a induced draft exists, allowing the pilot sequence to commence.
electronic spark type units have a high voltage low amperage spark that is AC. Fire rectifies electricity that passes through it meaning AC becomes DC ! Fire is a terrible conducter however as a result , the DC signal is only milliamps/volts signal strength. the DC prescence is proof a flame exists for pilot, and safe to commence to mainburners.

As long as pressure switches stay closed, safeties and limits stay closed
and the DC signal to the ignition module is not broken, the furnace will run.

The normal sequence of operation is upon a call for heat from the thermostat a 24 volt signal is sent to W white (heat circuit) at the low voltage terminal board on furnace.
from there depending on unit and age the heat circuit may include a circuit board, but it still has the typical limits and safetys reqired for operation
its just not using electromechanical relays to control fan and induced draft motor etc.

for the induced draft to begin ,all limits, safetys in heat circuit must be closed.

induced draft begins and a proving switch, either pressure or centrifigal close allowung the pilot to begin, a spark or hot surface ignitor is energized and a pilot flame established,modern types use flame rectification to prove a flame, older Carrier, Payne,types have a 3 wire switch in the piloyt assembly that is a bi metal that expands and contracts clicking open and shut, allowing pilot or main burners, depending if cold or hot.

pressure switches are attached with tubing to the induced draft wheel housing and sense pressure differential and close upon induced draft running, the orifices that the tube attaches to on induced draft housing often plugs or is restricted causing pressure switch to fail to close, or waver on open and close , open , close, .

if you can run the fan in the on postion , you have both high and low voltage to the furnace.

if you dont have fan control check power, breaker , fuses.

on Dec 04, 2009 | Heating & Cooling

1 Answer

Brand new furnace wont start its a aruf 14 electric air handler with a 10 amp heater coil


the 3 amp fuse protects low voltage side of transformer. if it's blowing on a call for cooling wire pair going to outside unit bad or contactor in outside unit.

Nov 18, 2013 | Goodman Heating & Cooling

2 Answers

I have a goodman gsc13 ac unit about 4 year old. When the temp gets around 90 or above outside the fan on the unit starts but the compressor does not. I had service check it out but that day they were...


It sounds like the unit may be over charged. Make sure the outside coils are clean and you have plenty of airflow coming out of the top of the outside unit. What could be happening is, when the temps get higher outside, so do the pressures in the system. The compressor has a thermal overload protection that will kick the compressor off if it gets to hot, which if the compressor is over charged, it will work twice as hard, over heat and shut off. You would need a technician to come out and get the refrigerant charge back to normal. Another thing that could be happening is a weak or faulty capacitor, which is a small round or oval metal object, found in the electrical compartment on the unit. This are fairly simple to change out if your comfortable with electric. I've also had to put what's called a hard start kit on compressors with the same problem, new and old. The hard start basically gives it that extra boost of power to get it up and going. I would start with the refrigerant charge and go from there. The electrical "humming" sound that you hear unless you turn the breaker to the furnace off, is the contactor on the outside unit having a call for cooling. The 24 volts come from the furnace, to the outside unit, and pulls the contactor in to power the unit with the 220 volts supplied. It is normal and you don't have to worry about that at all. I hope some of this helps and good luck!

Jul 05, 2011 | Heating & Cooling

1 Answer

Model 363616ba There is no control voltage going to the outside unit. Outside unit will not energize. What is the routing for control voltage? Do you have a schematic with details of the control...


The control voltage comes straight from the furnace or thermostat. Its 2 to 5 wires depending on if you have a heat pump or conventional system. If you have a control board on the inside of the furnace that has the terminal (y), then your control voltage will come from that terminal and the common terminal. Sometimes they have it connected to the (y) terminal from the thermostat, but will usually still be hooked up inside or right by the furnace. In (COOL) mode, the thermostat energizes the y and g terminals, (cooling and fan), which is sent to the outside unit on the contactor. You need 24v going to the contactor outside for it to pull in and make contact. If you have lost the low voltage, then it usually means bad transformer on the furnace (which nothing would work), faulty control board on furnace, faulty thermostat, or your low voltage wires could of been cut, chewed through, etc. If you do have the low voltage by chance, then it could be a faulty contactor on the condensing unit. I'm just throwing some things out there, its kind of difficult without knowing all the equipment you have. Have anymore questions, just ask. Good luck!

Jun 12, 2011 | Goodman Heating & Cooling

1 Answer

Model # ckl49-il serial # 0506126514. This unit stopped working yesterday, noticed the fan on the outside compressor wan't turning, how do i test the capacitor and fan to see which one to replace?


By far the most common problem with air conditions is the relay (known as a "contactor") by the air conditioner industry. This allows a low voltage (24 volts) electromagnet to turn on the 220 volt motor for fan and compressor. A replacement will generally cost about 50 to 75 dollars on Amazon.com.


Look for the wires entering the unit, The pair of wires entering the unit will go into a small (4" x 2" x 2") unit (the contactor). Another pair small diameter wires will go into the contactor (those are from the thermostat (or control panel of your furnace blower) and control the electromagnet switch.

The pair of output wires exit the unit and go to the compressor motor and fan.

You can check the output power by
1) Turning off the circuit breaker to the A/C
2) Unplugging the switch (must be a second switch within 3 feet of the A/C) near the house
3) opening up the outside panel on the A/C
4) Set voltage meter probes on the two output wires on the Contactor (make sure voltage meter is set to 220 volt AC range or higher)
5) turn on the outdoor switch
6) turn on the circuit breaker (if no body is near the unit and you can see the voltage meter without touching it)
7 check voltage meter to see that is says 220 volts AC

If not, then the contactor is bad and needs to be replaced.

A professional can usually do it for $200 including service call. I highly recommend calling a professional if you feel uncomfortable in any way about working with 220 volt systems. This voltage will kill you if you make a mistake!

-Mark

May 28, 2011 | Goodman CKL49AR49 Air Conditioner

1 Answer

My miller ac outside unit will not come on unit is only 2 years old. I checked breakers and capacitor I have voltage to outside unit? any recommendations?


If you were able to check the voltage, did you check to see if you had 24volts at the contactor? Did you
have 220 volts coming into the contactor? If no to the
first question and yes to the 2nd question, take a
insulated screwdriver and push the contactor in, the
unit will run. You have a low voltage problem.

2nd, do not reference the 220 volts to ground, if you
dont have 220volts feeding into the contactor,
example read voltage between L1 and L2.

Jun 14, 2010 | Heating & Cooling

2 Answers

As I was cutting weeds away from my outdoor ac unit, I accidentaly cut through a small wire that has a red and white inside of it, we wired them back together and still have no ac or heat or air, we just...


first try turning off the power to the furace for 15 sec and tunr it back on (reset the computer) you may have blown a control fuse on the contol board inside the furnace, turn off power and becareful of hazardous voltage conditions

Aug 15, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

Unit not coming on. air isn't getting cold


First check the breakers for the condensing unit (outside unit) and the disconect outside by the unit (could be a breaker ,a pull off/on switch or fuses)If its ok , you should have 220 ,240 volts to the unit contactor (you'll see it after removing the cover on the condensing unit).When the termostat is in the cold position and the temperature its set is lower than the one inside the house the contactor should be pulled in and give power to the compresor and the fan.But if the termostat is in the cooldest set and the blower inside the house works and the contactor in the condensing unit is not pull in the problem is in the termostat or in the low voltage wire.

Apr 24, 2009 | Heating & Cooling

3 Answers

3 amp fuse blows on a carrier 58mcb furnace board


Hi!!! Does your ac unit work fine?If not check your low voltage problem..You have a low voltage problem check the wire going out to your condensor make sure that they are not touching..Good luck..Check low voltage wires..short in progress..

Jan 04, 2009 | Carrier 52CQ-312-4 Comfort Series Heat...

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