Amana PTAC Air Conditioner Error Codes


Amana Corporation is an American-based home appliance brand that was founded in 1934. The Electrical Equipment Co based in Middle Amana, Iowa started with commercial walk-in coolers and slowly but surely made its way to other appliances. While the company’s main focus was refrigerators and freezers at one point, they took on the plague of adding an extra addition.

The company started building air conditioner systems in 1954 and has been taking over a fair chunk of the market since its inception. Offering both residential and commercial air cooling and heating systems. Their wide range of selection makes it easy for consumers to choose an appliance that matches their space and budget.

Amana PTAC air conditions come in a wide range of options, but there are some general error codes that may pop up at some point. To help you out we have listed down some of the most common error codes for Amana PTAC Air Conditioners. Start by noting down the error code, and match it using the list below. Once you have the error code you can easily work your way to the fix.

Package Terminal, Air Conditioner/Heat Pump. Amana Diagnostic Codes;




If there are no active failures or lockouts, the display will show a double dash, “- -”. If there is a code listed, see the unit “Diagnostic Codes” chart for a list of definitions.

Error CodesProblem
FPFreeze Protection Engaged. The room temperature measured by the wireless remote thermostat or indoor ambient thermistor active sensor falls below 40°F. No Action required. This setting will disengage when the room temperature rises above 43°F.
FdFront Desk switch is closed. All outputs are switched off. Open front desk switch to allow occupant unit operation.
EoUn-Configured Service Board - All operation held awaiting configuration. Enter Configuration Menu and set "C3" to "C" for coolers with electric heat or "H" for heat pumps.
EHEmergency Hydronic Engaged. The EHH switch is closed. Compressor is switched off. Open front emergency hydronic switch to allow occupant unit operation.
LSLoad Shedding Engaged. The LS switch is closed. Compressor and Electric heat is switched off. Open load shedding switch to allow occupant unit operation.
OnControl is configured to respond to a wired thermostat. No action if a wired thermostat is being used. Otherwise, see Configuration Settings.
oPOpen Door Lockout (DS1 & DS2 open; wireless). Close Room Door. Unit will not condition space with door open.
nPWindow Switch Lockout - (LS & INN open). Close Room Door or Window. Unit will not condition space with door or window open.
HPHeat Sentinel - (WIAT > u3). No action required. This setting will disengage when the room temperature falls.
UrUn-Rented Status (EHH & INN or wireless). Front Desk needs to set to Rented mode (if applicable).
F1Indoor Ambient Thermistor reads outside the range -20°F to 200°F & the wireless thermostat is not communicating to the unit control or Indoor Ambient Thermistor (IAT) without a wireless remote thermostat reads outside the range -20°F to 200°F. Replace black Indoor Ambient Thermistor or Wireless Remote Thermostat.
F2Wireless Remote Thermostat failure. Replace Wireless Thermostat.
F3Indoor Ambient Thermistor reads outside the range -20°F to 200°F. Replace black Indoor Ambient Thermistor.
F4Indoor Coil Thermistor either above or below operating tolerances. Replace Red Indoor Coil Thermistor.
F5Wireless Thermostat failure. Attempt to rebind Wireless Thermostat or Replace Wireless Thermostat.
F6Indoor Discharge Thermistor either above or below operating tolerances. Replace Yellow Indoor Discharge Thermistor.
FbLow Remote Battery Warning. Replace Batteries in Wireless Devices.
H1High Voltage Protection engaged. Power supply voltage is to high. Check for incoming power at correct voltage.
brBrown Out Protection engaged. Power was lost or voltage is low. Check for incoming power at correct voltage.
L6Discharge Air Too Hot. Clean Filter or Remove Air Blockage.
LCOutdoor Coil Thermistor temperature high. Clean Condenser Coils, Check Fan for fault. Code will reset after cleaning.
C2Indoor Air Recirculation. Large delta between thermostat and return. Clean Filter or Remove Air Blockage or Close Vent Door or Improve indoor to outdoor seal.
C5Outdoor Coil temperature too high for outdoor ambient temperature. Check for Blocked Outdoor Air or Clean Coil.
C1Indoor Coil is freezing up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
C3Indoor Coil is freezing up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
C4Indoor Coil froze up. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.
C6Poor Unit Performance. Check for blower motor, compressor, or electric heat operation.
C7Indoor Freezing Lockout (ICT - IAT > 20) +10 Min. Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.

Amana Air Conditioner Troubleshooting

Amana Air Conditioner Troubleshooting
Amana Air Conditioner Troubleshooting

Troubleshooting Chart for ECM Variable Speed Air Circulator Blower Motors

SymptomPossible Causes
Motor rocks slightly when startingThis is normal start-up for variable speed motor.
Motor won't start1. No movement. 2. Motor rocks, but won't start.
Motor oscillates up & down while being tested off of blowerIt is normal for motor to oscillate with no load on shaft
Motor starts, but runs erratically1. Varies up and down or intermittent. 2. "Hunts" or "puffs" at high CFM (speed).
Excessive noise1.Air noise. 2.Noisy blower or cabinet. 3."Hunts" or "puffs" at high CFM (speed).
Evidence of MoistureMotor failure or malfunction has occurred and moisture is present
Amana PTAC R410A AC Error Codes C1,C2,C3,C4,C5,C6,C8,C9,CD,D5,D7,D8,D9,DA,DB,DC,DF,R4,R5
Amana PTAC R410A AC Error Codes C1,C2,C3,C4,C5,C6,C8,C9,CD,D5,D7,D8,D9,DA,DB,DC,DF,R4,R5
DIAGNOSTIC CODES L6,LC,C2,C5,C1,C3,C4,C6,C7
DIAGNOSTIC CODES L6,LC,C2,C5,C1,C3,C4,C6,C7
Amana PTAC Wiring Diagram
Amana PTAC Wiring Diagram

Amana PTAC R410A AC Manual PDF

PACKAGE TERMINAL AIR CONDITIONER/HEAT PUMP Standard and Remote Applications with LED M70 Control Board and R-410A PDF




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30 thoughts on “Amana PTAC Air Conditioner Error Codes”

  1. I have a Amana ptac that when turned on if you push the cool or heat button it will display the temp and show d4 and you hear a relay click. The unit will go into heat mode but in the cool mode only the two fans will come on. I jumped out the compressor the unit cools very well. Can anyone offer help on this d4 code?

    Reply
  2. Has anyone else come across Ec?
    We recently had a Amana PTAC pth093g35r throw a Eo error code… I was able to drop the Eo code by changing C3 to C but that only brings up the Ec code.
    Something interesting, when the RF antenna is plugged in the whole display goes off as if the unit has lost all power display?

    Reply
  3. Model PBE093g35cc, the fan will not shut off in the cool mode when on auto. Also, how does a person reset this model. Sometimes I’m getting an “FO” code. Thanks

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  4. Problem with Amana PTAC. The only power I get to the board is the green flashing light under the off button. Everything says this green light should be on solid for error codes, plus nothing else lights up. the unit does make a slight humming sound when plugged in. Not should if replacing the board will help. The unit will not display any codes at this time.

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    • My Amana PTAC is only displays “L”. We have done the manual reset but it doesn’t change anything. I can’t find anything on the internet about this code. I can find a few other codes that contain “L” but not just “L”. I would appreciate any help. Thanks

      Reply
  5. Unit showing code c7. I have alot of these units and continue to have the same problems… The unit will cool perfectly for 15-20 minutes and then all the sudden it stopped cooling, once I reset it it will run again for 30-40 minutes maybe 15 minutes and then it will cut itself off again???

    Reply
    • Hi Gerald, I’m having a similar problem, the only difference is that the error code is nA, I just called Amana tech service and they told me that the Off button was defective and the Touch Panel needs to be replaced, did you find out how to fix your problem? I don’t want to get a new TP if it’s not going to fix the issue…

      Reply
  6. nP Window Switch Lockout , a unit in our hotel is giving me this code why? Windows dont open and door is always closed . Dont unerstand!

    Reply
    • F4 Indoor Coil Thermistor either above or below operating tolerances. Replace Red Indoor Coil Thermistor.
      F6 Indoor Discharge Thermistor either above or below operating tolerances. Replace Yellow Indoor Discharge Thermistor.

      Reply
  7. I’m an apartment and have an Amazing air conditioner. Was working fine took the kids out to play turned it off. I returned three hours later and the reset button was popped out I pushed it back in to find the error code nA. What does that mean!? Is it broken and how!?

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