American Standard Error CodeWhat this means
Green light on, slow flashing, or fast flashingUnit is operating normally
Amber light onUnit requires refrigerant
Red 1 flashCommunication error
Red 2, 3, and 4 flashesDefrost fault
Red 5 flashesFault with the ambient temperature sensor
Red 6 flashesFault with the coil temperature sensor
Red 7 flashesLow-pressure problem
Red 13 flashesFault with the external temperature sensor
Red 17 flashesHigh-pressure problem
Is your air conditioner...The problem might be your...What's wrong?How you can fix it
ThermostatThe batteries in your thermostat may be dead, or the thermostat may not be on the correct setting.Put new batteries in your thermostat and ensure that it is on the cool setting.
Circuit breakerThe breaker switch may have flipped.Move the breaker switch back to the “on” position.
Not blowing cold air?Air filterIf the filter is clogged with debris or dust, it won’t be able to do its job.Replace or clean your air filter so that air can flow freely.
Outside unitThe air conditioner may not be able to have air flowing freely if there are dirt and debris around the unit.Make a two-foot space around your unit that is clear and free of leaves, greenery and any other blockage so that it can vent air properly.
RefrigerantIf the refrigerant is leaking, your unit will not be efficient at cooling since there is less cooling fluid to run through your unit.Get a technician who can solve this problem.
InsulationInsulation is important to keep air from leaking out. Cracks, old windows and doors are all spots where cold air can escape.Windows are the main places where cool air escapes. Consider upgrading to insulated windows or use blackout curtains.
Dripping water?Condensate lineThe pipe that exits your air conditioner could be clogged.Blow compressed air through the pipe to dislodge the clog.
Drain lineWater can overflow in the drain pan if the drain pipe is blocked.Check the drain line for any clogs and remove them.
Making odd sounds?Blower motor or beltSquealing sounds can come from the belt or the blower motor.Use lubricant on the parts to help them run better without squeaking.
Fan bladesIf the sound is repetitive like a card stuck in a bicycle spoke, there is a chance something is caught between the blades.Switch your unit off and check the fan blades to see if anything is trapped and remove it carefully.
Carrier Error CodeWhat this means
Solid on, one flash, and two flashesNormal operation
Error Code 16System communication failure
Error Codes 31 and 84High-pressure problem
Error Codes 32 and 83Low-pressure problem
Error Code 45Fault with the control board
Error Codes 46, 47, 73, 74, 75, 76, 77, 78, 85, and 87Voltage problems
Error Code 53Fault with the outdoor temperature sensor
Error Code 55Problem with the coil
Is your air conditioner...The problem might be your...What's wrong?How you can fix it
ThermostatThe batteries in your thermostat may be dead, or the thermostat may not be on the correct setting.Put new batteries in your thermostat and ensure that it is on the cool setting.
Circuit breakerThe breaker switch may have flipped.Move the breaker switch back to the “on” position.
Not blowing cold air?Air filterIf the filter is clogged with debris or dust, it won’t be able to do its job.Replace or clean your air filter so that air can flow freely.
Outside unitThe air conditioner may not be able to have air flowing freely if there are dirt and debris around the unit.Make a two-foot space around your unit that is clear and free of leaves, greenery and any other blockage so that it can vent air properly.
RefrigerantIf the refrigerant is leaking, your unit will not be efficient at cooling since there is less cooling fluid to run through your unit.Get a technician who can solve this problem.
InsulationInsulation is important to keep air from leaking out. Cracks, old windows and doors are all spots where cold air can escape.Windows are the main places where cool air escapes. Consider upgrading to insulated windows or use blackout curtains.
Dripping water?Condensate lineThe pipe that exits your air conditioner could be clogged.Blow compressed air through the pipe to dislodge the clog.
Drain lineWater can overflow in the drain pan if the drain pipe is blocked.Check the drain line for any clogs and remove them.
Making odd sounds?Blower motor or beltSquealing sounds can come from the belt or the blower motor.Use lubricant on the parts to help them run better without squeaking.
Fan bladesIf the sound is repetitive like a card stuck in a bicycle spoke, there is a chance something is caught between the blades.Switch your unit off and check the fan blades to see if anything is trapped and remove it carefully.
Is your air conditioner...The problem might be your...What's wrong?How you can fix it
ThermostatDead batteries may be the cause, or the thermostat may be on the wrong setting.Replace the batteries and ensure that the thermostat is set to cool.
Circuit breakerThe breaker switch may be turned off.Flip the switch back to the “on” position.
Not blowing cold air?Air filterThe filter may not be effective if it is full of debris.Change or clean the air filter if you haven’t done so in a while.
Outside unitThe air conditioner unit may be unable to vent hot air out properly if there is debris in the way.Clear out vegetation and leaves from near your unit, ensuring that you have at least 2 feet of clear space around your A/C.
RefrigerantLeaking refrigerant means that your unit is less efficient and won’t cool well.Call an HVAC technician to address this problem.
InsulationInadequate insulation in the walls, windows or doors means that cool air can leak out while hot air gets trapped.Windows are common spots where air leaks out. Think about upgrading to insulating windows or use blackout curtains.
Dripping water?Condensate lineThe PVC pipe that exits your air conditioner may be blocked.Use compressed air to remove the blockage.
Drain lineIf the drain is clogged, water will end up overflowing from the drain pan and can get into internal parts and cause damage.Check the line and remove the clog before it causes more problems.
Making odd sounds?Blower motor or beltSqueaking sounds may mean that there’s an issue with the belt or blower motor.Applying lubricant can help the parts run better.
Fan bladesIf the sound is like a card stuck in a bicycle spoke, there may be something caught in the fan blades.Turn off power to your air conditioner and check if there is debris between the blades and carefully remove it.
Is your air conditioner...The problem might be your...What's wrong?How you can fix it
ThermostatBatteries may be dead, or the thermostat may be switched off.Change the batteries and check that the thermostat is set to cool.
Circuit breakerThe breaker may have been switched off.Turn the switch to the “on” position.
Not blowing cold air?Air filterThe filter may be clogged or full of debris.If you haven’t changed your air filter in a while or you’ve been running your A/C more than normal, it’s probably due for a change.
Outside unitThe air conditioning unit outside your home may not be able to vent the hot air from your home properly.Check to make sure your unit has at least 2 feet of clear space. Remove vegetation and leaves from in, on and around your unit.
RefrigerantIf the refrigerant is leaking, you won’t be getting cool air.Call an HVAC expert to fix the issue, since it requires trained expertise.
InsulationOld homes may have insulation gaps that let the cool air leak out.Windows are common culprits, consider replacing or using blackout curtains.
Dripping water?Condensate lineThe PVC pipe that leaves the A/C unit may be clogged.Use compressed air to clean it out and allow normal function.
Making odd sounds?Blower motor or beltSquealing may indicate that there is an issue with the belt or blower motor.Adding lubricant to the oil port can help the parts run smoothly.
Fan bladesIf the sound is more like a slapping noise, the problem may be with the blades of the fan.Something may be stuck in the blades. Turn off power to the unit to check if this is the cause and remove it.
Rheem Error CodeWhat this means
Error Code 0Unit is on standby and operating normally.
Error Code CUnit is operating normally and in a cooling stage.
Error Code Flashing CCooling was commanded during an active anti-short cycle.
Error Code DUnit is operating normally and in a defrost cycle.
Error Code TUnit is in test mode.
Error Code PThere's no current going to the compressor.
Error Code 01The compressor is running continuously, possibly because of low refrigerant or a dirty air filter.
Error Codes 02, 29, and flashing L29High-pressure problem.
Error Code 03Unit is short-cycling.
Error Codes 05, 06, 07, L6, and L7Problem with the compressor because of an open circuit.
Error Codes L4The rotor is locked because of protector trips.
Error Code 09Secondary voltage is low.
Error Codes 21 and flashing L21Low-pressure control is open.
Error Code 27Low or no line voltage.
Error Code 28High line voltage fault.
Error Code 30On-board fuse is open.
Error Code 80Unit isn't meeting minimum airflow requirements.
Error Code 83Problem with the condenser coil temperature.
Error Code 93There's a problem with the internal control.
Is your air conditioner...The problem might be your...What's wrong?How you can fix it
ThermostatCheck the batteries. They may be dead, or the thermostat may be on the wrong setting.Replace the batteries in your thermostat and double check that it’s on the cool setting.
Circuit breakerThe breaker switch may be turned off.Flip the switch back to the “on” position.
Not blowing cold air?Air filterThe filter needs to be clean to do its job. If it’s clogged with dirt or dust, it won’t work.Replace or clean your filter to allow air to blow better.
Outside unitIf the area around the unit has foliage, furniture or debris laying around it can stop air from flowing correctly.Clear a two-foot space around your air conditioner and keep it clean so that nothing blocks the airflow from your unit.
RefrigerantLeaking refrigerant will cause the unit to be less effective since there is not enough cooling fluid to work.A professional HVAC technician can fix this for you.
InsulationWithout insulation, air can leak out from your home. Cracks, windows and doors are common areas where this happens.Consider upgrading your windows to ones that are more insulating or use blackout curtains to keep the sun and heat out.
Dripping water?Condensate lineThe pipe leaving your air conditioner may have debris inside it.Use compressed air to remove the clog.
Drain lineIf the drain pan is full, it can cause the drain line to be blocked and water to overflow.See if there are any blockages in the drain line and clear them. Empty your drain pan as well.
Making odd sounds?Blower motor or beltSqueaking sounds are typically from the belt or the blower motor.Lubricant can help the parts to run smoothly without squeaking.
Fan bladesIf the sound is like a card in a bicycle spoke, then it’s likely that something is stuck between the blades.Turn off the unit, open it carefully and check if there is something caught between the blades and extract it gently.
Rheem Error CodeWhat this means
Error Code 10There's a one-hour lockout in place.
Error Code 11The ignition failed.
Error Code 12Low flame detected.
Error Code 13The flame was lost.
Error Code 14There was an unexpected flame.
Error Code 20There was a twinning fault.
Error Code 22Problem with high limit.
Error Code 26Reversal of line and neutral.
Error Code 33Roll-out switch problem.
Error Codes 55 & 57Pressure switch issue.
Error Codes 58 & 59Water or condensation problem.
Error Code 61Problem with the blower.
Error Code 93Problem with the control.
York Error CodeWhat this means
Error Codes E7 and F3, or 4 and 15 flashesCommunication failure
Error Codes E1, E2, F21, F7, F6, and F25, or 10, 11, 12, and 13 flashesSensor failure
Error Code E14Indoor fan malfunction
Error Codes F19 or 6 flashesHigh voltage
Error Codes F8 or 9 flashesOutdoor fan malfunction
Error Codes F11 or 18 flashesAbnormal compressor function
Error Code F2 and F23, or 24 and 25 flashesOvercurrent problem
Goodman Error CodeWhat this means
Red light onThere's been a call for cold air, but the compressor isn't running
One yellow flashCompressor cycles are too long
Two yellow flashesHigh-pressure problem
Three yellow flashesCompressor cycles are too short
Four yellow flashesRotor is locked, possibly because of a failed capacitor
Five, six, seven, or nine yellow flashesProblem with the circuits or voltage
Eight yellow flashesCompressor is always running

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