Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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Furnace problem, I have a carrie furnace. When I turn the termistate to heat it goes blank. It show the degree on the Central Air. I check all the fuses they are good. When I turn the power switch on I can hear a buzzing sound. please help its getting cold here.

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You may have a short circuit in the heating circuit, call a technician.

Posted on Jan 21, 2010

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Posted on Jan 02, 2017

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Goodman gph1348m41ac unit is blowing cool air in heat mode with mid 30s ambient outdoor temp. I turn it off then on and will usually blow warm air but this cycle is becoming more repetitive. any expert...


A heat pump on the optimal heating day (about 50 degrees ambient) will only deliver approximately 85 degree air as compared to 125 degree air from a fossil fueled furnace. The colder the outdoor air is the less heat there is available to be transferred to the living space. At 30 degrees, the heat transfer capability is getting close to negligible meaning the run cycles will be approaching continuous and eventually as the heat pump along cannot maintain setpoint, the outdoor stat or stats will bring on auxilliary heat in the air handler.

If your ambient temp is below the 'balance point' of the heat pump, the house temp will drop a little lower and most times energize the heat strips through the outdoor t-stat. Your outdoor stat could be set too low for the heat pump to carry the structure all the way down to the balance point so when you turn it off and back on, the lower indoor temp automatically brings on the heat pump plus a heat strip or two, thus the warmer air. Second stage on the stat satisfies due to the heat strip, drops them out of the circuit and the heat pump is left running on first stage heat delivering the perceived cold air.

Your outdoor stat could also be not functioning correctly and not allowing the heaters to come on until the system is turned back on reestablishing the two stage call for heat.

Tons of possibilities and not enough room to list....

Jan 01, 2015 | Goodman Manufacturing Goodman GPH1348M41 4...

1 Answer

Unless we set the thermostat very high, like 80 degrees, the heater will blow cold air. When the heat does blow, it will eventually stop blowing heat and the fan will continue to blow cold air.


Check and make sure the filter is clean. This sounds like a restriction in the system. If the unit has central cooling make sure ther indoor evaporator coil is clean at the furance.The unit may be cycling the burners on and off at the high heat limit , fan/limit control. You can also eliminate the thermostst from the furance. Turn power off at the furnace and disconnect the wiring from the thermostat. Jumper the red and white wire together. Turn the furnace back on. The furance should run in the heating mode. Try this and see if the problem is still there.

Jan 25, 2011 | Heating & Cooling

1 Answer

I have a Honeywell CT500A thermostat. I set it at 68 degrees. the room temperature is 62 degrees. The unit cycles on and the "flame" icon shows on the screen, but then the unit goes off ( the...


Here is a simple way to tell. Remove your thermostat from it's mounting plate, locate the wiring, the red and white are low voltage control wires. Disconnect them from the base and join the two together if the furnace runs you need a thermostat if not it is in the controls to the furnace.

Dec 27, 2010 | Honeywell CT500 Digital Heat / Cool Manual...

1 Answer

Hello We have a Trane central air


Bad thermostat, improper wiring or bad circuit board in furnace. Turn off the disconnect outside.

Dec 30, 2009 | Heating & Cooling

2 Answers

Carrie Furnance will not power up. When I turn my thermostate to heat or off it goes blank. It works on central air. I checked the breaker and it is on. I made sure the switch is on at the furnace. There...


if under warrenty DONT MESS WITH IT call hvac co out WORST THING IS TO GO TO A CALL were harry home owner has pulled stuff appart n got wires crossed makes the techs job un real ive walked on basket case calls like this i dont build em just fix em as for waTs up if u got fan on with ac and nothing on the heat and stat blanks out im leaning toward either a stat issue or a fnky board......i

Oct 05, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

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When we turn on the central air there is a strong burning smell...like burnt toast but way stronger. IS it safe to remian in the house?


Is your central air furnace or electric heat. Electric furnace sometimes have electric strip sequencer stick in the closed positions leaving on one strip of the electric heat. Get a service tech as soon as possible to check this out. Any smells from a central unit need to be teken care of promptly. TURN OFF unit you have it checked for your safety. Rus

Jun 28, 2009 | Coleman Heating & Cooling

1 Answer

I want to know the conection between the thermostat and the fan and compressor in the central air conditions


r and rc @stat to r on furnace
w @stat to w on furnace
g @ stat to g on furnace
y @ stat to y on furnace
from furnace 2wires going to out side unit typical red & white wire. red goes to y @ furnace and white goes to the neutral of the trans former . BE SAFE turn off power.

r = Red wire Hot
w= White wire heating
g = Green Fan
y= yellow cooling

if their is a B or C @ the furnace terminal board that the neutral . Tom

Jun 14, 2009 | Fujitsu 24C1 Air Conditioner

2 Answers

Furnace runs on heat, air conditioner does not


If you have a Gas furnace in the Attic then the answer is yes. The outside condenser will not run if in fact you have a gas furnace.

Feb 11, 2009 | Ruud Central System Air Conditioner

1 Answer

Central honeywell air conditioner


Sounds like it may have lost power. Check the breaker and the fuse at the furnace. If they are all in the on position and working then it sounds like you may need a technician. If the display is blank on the thermostat you may also want to replace the batteries.

Jun 12, 2008 | Honeywell Electronic Programmable...

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