Question about Carrier 38CKC036 Air Conditioner

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Power to AC does not stay on

Furnace blower and thermostat are on and working fine,power to condenser but will not turn on until I press the switch at the junction,as soon as I release it shuts off.Filter was clogged and I replaced it,breaker was tripped and I turned it back on

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Sounds like you might have more than one issue. If the breaker is tripping could be the compressor. If you have to press in the contacts to make it come on something is not sending 24 volts to the contactor. may be a bad wire that runs from the outdoor unit to the control board in the furnace.

Posted on Nov 24, 2008

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Goodman aepf426016aa


Communication problem. You say condenser stat and power are fine? if that means the condenser runs but the air handler doesn't that means the communication is good and the blower is not running. That may be a capacitor (you must have ammeter capable of checking microfarads) if not that check power it may be board driven. If no power to blower the board is bad assuming power is at board. If that is ok the blower motor is bad.

Nov 29, 2013 | Goodman Air Conditioners

1 Answer

The heater coils are staying on after the thermostat kicks the blower off on the furnace. The coils are heting up the whole furnace until the blower kicks back on. Shouldn't the coils turn off when the...


Hi,

The contactor or relay that turns the coils on has burnt the contacts closed....therefore the contacts are not releasing and shutting down the coils...

A rap to the side of the furnace may knock them loose but they will need to be replaced...

You can also shut them down by turning off the power to the furnace at the breaker.

heatman101

Jan 18, 2011 | Air Conditioners

1 Answer

My central heating is on lockout and the burner is with red light


A sampling of various codes on a furnace

Read one LED flash that stays on continuously to mean your furnace has no signal coming from the thermostat and will not operate. Turn the power off and check the thermostat for improper settings or connections.

Interpret one LED flash that blinks on and off to mean your furnace has locked out because it could not ignite after three tries, and must be reset. Interrupt power to your furnace for 20 seconds or lower the thermostat so your furnace does not try to heat, then reset the thermostat to the previous setting. After one hour of lockout, your furnace will automatically reset itself and try to operate as usual.

Decipher two LED flashes to mean the draft blower is not working, or your furnace has a short in the pressure switch circuit. Turn off the furnace power and repair a short or replace the pressure switch.


Read three LED flashes to mean your furnace has an open pressure switch circuit or it has an induced draft blower operating. Check the pressure switch hose of your furnace for blocks or an improper connection. Also, look for blockages in the flue, and tighten any loose wiring.

Translate four LED flashes to mean your furnace has a primary limit circuit open, possibly from loose wiring or blocked filters. Check and clean filters, tighten wiring and check the flue for blockages.

Interpret five LED flashes to mean your Goodman furnace senses a flame without a call for heat. This could be from a gas valve closing slowly or a burner flame lingering.



Read seven LED flashes as a warning of a low flame sense microamp signal. This could happen with a coated flame sensor or a lazy flame from poor gas pressure. Turn off the power and adjust the gas pressure according to the information on the rating plate.



See eight LED flashes as meaning an igniter circuit problem due to a bad igniter or an igniter connected improperly. Replace the bad igniter or check the ground wiring, making necessary corrections.



Decipher nine LED flashes to mean the high-stage pressure switch circuit will not close during a high-stage-induced draft blower operation. Your furnace may have a pinched or blocked pressure switch hose, a blocked flue or loose wiring.

Read continuous flashing on the LED to mean your furnace has a reversed polarity of 115 volts. Turn off the power and correct the wiring polarity after reviewing the wiring diagram.

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1 Answer

Outside ac unit operates but no blower. Fan "on" does not operate from thermostat. However "heat" works fine furnace and blower. ???


Go to furnace and shut off power, remove blower door compartment. Inside you will find a control board where thermostat wires are connected. Should look something like this:

R-Red Wire= Power
G-Green Wire= Fan
W-White Wire=Heat
Y=Yellow or Blue Wire=Cooling.

It sounds like you have a bad motor speed. So try this:

With Power Still Off, on the same control board there is a terminal usually marked Cool and Heat. There should also be a couple of terminals that are named park. The wires hooked to these are the fan wires..

Exchange the Heat and Cool wires on the terminal board. Put everything back together and try cooling again, if the fan comes on
then you have a burnt out motor speed. Go back to furnace and change
the heat and cool wires around, next if Cooling had the black wire hooked to it, put yellow or blue on Cooling and black to park.


Note: The reason why you put the blower door back on is because it
has a door switch that if not properly seated, you wont be able to power
up anything

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1 Answer

I changed the thermostat and then the ac stopped working


if this is a split system, go to the furnace or air handler. Shut off the power, remove blower door and find where thermostat wires go to control module.

Remove thermostat wires writing down where each one goes. Make a jumper wire and install it between r and y or r and y1.Put everything back together and turn on power. IF blower motor and ac start, you have
a low voltage wiring or thermostat problem.

If nothing happens then you either have no power to furnace, transformer
could be bad or you have blown a little 3amp automotive fuse that is
installed on the control board.

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1 Answer

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1 Answer

AC unit turns on blower doesn't come on


The thermostat is the controller.

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1 Answer

Carrier Weathermaker SXI Model 58SX8100LG Code 12


Code 12 I believe is power up after power off and a call for heat from the the thermostat. If you have a weak door switch that may be vibrating and going on and off it would cause this as would any thing that causes the power to drop low or out then reapply its self. try holding the door switch in while watching the board and after 2 or 3 minutes the furnace should go on to lite and the blower cycle off. If it stays in this mode try turning the thermostat off (heat - OFF -cool) and then push in the door switch nothing should happen except the lite on the board come on and stay on. If it does this than have someone turn the thermostat to heat and see if it starts or put the door on and set the heat and see if *** goes through the normal cycle of heating. If however it goes right back into the blower mode and shows the 12 code your problem is still with you. So next remove the wire on the "W" terminal on the board. Retry power to the door switch and now nothing should be on except the red lite. If it tries to start the 12 code and blower up again Im pretty sure you have a bad ignition/blower control board.

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Rheem Central Air united stopped working, no hum but power is there


It looks as if the 24 signal from the thermostat is not getting to the contactor. Or possibly the coil in the contactor itself is dead. Or a third option may be a bad control power board in the condensing unit itself. If you feel comfortable reading through these devices comment back. PLEASE REMEMBER THERE IS HIGH VOLTAGE INSIDE THE CONDENSER AND A CAPACITOR.

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1 Answer

What part do we replace first?


Door safety switch. You are sure you have power to furnace? jump out the G and R terminals on the furnace control board or turn your thermostat to Fan On to check. Make sure the door safety switch is in the closed position. Fan should come on. No fan, no power to unit. Check Emergency switch, circuit breaker and there may be a fuseable link in the wiring somewhere either above the unit or a condensate safety switch. Get power to the unit. Also check to see if there is a small fuse in the wiring inside the furnace or on the circuit board.

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