Carrier Outdoor Unit Communication FaultWithout it nothing happens since the thermostat does not detect the compressor. 11 or 1 1: Serial Communication Error – The indoor/outdoor units are not communicating. Outdoor unit has 240 vaults and the control board has 24 colts. Carrier, fault, troubleshooting Add other devices one at a time to determine where the communication issue exists. E1 – There is a communication error between the outdoor and indoor units. The Carrier thermostats refer to the high-grade equipment. The error codes for diagnostics of this equipment can be found below in the form of a table. Secured the connection and then rerouted the air handler wiring so that it was not running alongside the power wiring for the air handler. The system can correct some breakings itself, but it does not help in all cases. Timer lamp status: off Operation lamp blinking: 2 times Carrier AC error code E1 troubleshooting procedure: Carrier air. Unfortunately, errors can happen, which is usually displayed on the indoor wall unit. Carrier "Outdoor Unit Not Communicating". I cut the breaker as the fan was blowing warm humid air and I couldn't turn it off otherwise and let it sit overnight. com ">Carrier communicating system fault. -Hold the “Reset” button for 3 seconds and then release. (The indoor unit is not communicating back with the thermostat/outdoor unit) This can be caused by numerous things, but most commonly, one of the below: 1. Installed in Oct 2010 - 25HPA536H0031010 Heatpump, 58CVA090 Furnace, CNPHP422 Coil, SYSTXCCUID01-B Thermostat. How to Reset a Carrier Air Conditioner 1. Then do a reinstall and try to communicate back to the indoor unit without problems. Installed in Oct 2010 - 25HPA536H0031010 Heatpump, 58CVA090 Furnace, CNPHP422 Coil, SYSTXCCUID01-B Thermostat. Code 13 -- Limit Circuit Lockout Code 14 -- Ignition Lockout Code 15 -- Blower Motor Lockout (ventilator, humidifier,. Could be indoor board, outdoor board, any thermostat wire, or that thermostat itself. I received this message: Carrier infinity code 179 ,outdoor…. A Carrier Outdoor Unit Communication Fault can occur for a number of reasons. Unit Not Cooling Properly Possible Causes: Clogged filter. I didn't spend much more time on it but I was in communication with the carrier tech and he said to out a 120ohm resistor between A and B on the ac unit abcd bus. Carrier infinity code 179 ,outdoor unit communication fault, JustAnswer-Q&A 5. Slide out the old filter and replace it with a new one. The error went away and it worked fine for a few hours, then the indoor unit communication error returned (the outdoor unit communication error did not return). Code 44 -- Motor Communication Fault (ventilator, humidifier, dehumidifier, outdoor unit will be turned off) Code 45 -- Control failure Furnace The code number represents flash code on circuit board of furnace. The Infinity Control Thermostat would intermittently show a "CRITICAL MALFUNCTION - INDOOR COMMUNICATION FAULT" on the display. Be sure to comply with local codes while running a wire from the indoor unit to the outdoor unit. Bryant Evolution Outdoor Unit Communication Fault 179 - I had to FIX MY OWN UNIT MalikoBoost 12K views 2 years ago Carrier Infinity Air Purifier Maintenance Michigan. An indoor or outdoor unit issue could be indicated by a green or orange LED flashing on and off. If a problem is isolated to the outdoor unit (comm error only occurs when outdoor unit is connected to the bus), the problem may be in the thermostat wire, or the outdoor unit wiring. Carrier infinity thermostat troubleshooting. There could be fuses in the outdoor power. The indoor unit may come on but not the outdoor unit. Ensure that your outdoor air conditioning (condensing unit) is running. If the UI and indoor unit communicate properly then you should be able to go to the outdoor unit or any other connected equipment, disconnect the wires to the ABCD bus, and connect those wires to ABCD on the UI. Mini Split Error Code List and Meanings – HVAC How To">Mini Split Error Code List and Meanings – HVAC How To. Indoor to Outdoor communication fault. Carrier Mini Split Error Codes List – HVAC How To">Carrier Mini Split Error Codes List – HVAC How To. Carrier thermostat error codes Error code 16 Fault description: System Commu-nications Failure Potential cause and action: Communication with the user interface lost. Check for 24VAC between the C and D terminal connector of outdoor unit. Carrier Infinity Troubleshooting: Signs to Look Out For">Carrier Infinity Troubleshooting: Signs to Look Out For. - You should Hold the “Reset” button for 3 seconds and then release. The most common reason is due to a bad connection between the outdoor unit and the indoor unit. 3K views 3 months ago 2:05 Indoor and Outdoor. Previous owner had a service contract with a local company that took care of yearly "tuneups" so the unit was well maintained. Communication and Status Function Lights 10 Troubleshooting 12 Fault Codes See also: Owner's Manual, Product Data 25VNA Infinityt Variable Speed Heat Pump with Greenspeedt Intelligence 2 to 5 Nominal Tons UNIT IDENTIFICATION. Their stylish design and simplicity of adjustment and indication of parameters of operation of the troubleshooting system, which is presented below in form of a table, show high quality standards of the equipment from Carrier. Bryant Evolution Outdoor Unit Communication Fault 179 - I had to FIX MY OWN UNIT MalikoBoost 4. If the code appears on your Carrier Infinity thermostat, then you should: 1. Loose wiring may cause the terminal to overheat or result in unit malfunction. -Locate the “Reset” button on the control panel of the air conditioner. First things first, make sure that you have power to the outdoor unit. I gathered as much information as I can from the thermostat display. Communication and Status Function Lights 10 Troubleshooting 12 Fault Codes See also: Owner's Manual, Product Data 25VNA Infinityt Variable Speed Heat Pump with Greenspeedt Intelligence 2 to 5 Nominal Tons UNIT IDENTIFICATION. Jan 26, 2019 · Carrier infinity code 179,outdoor unit communication fault, 2 days, 2 days, filters good, have remove thermostat and – Answered by a verified HVAC Technician. Bryant Evolution Outdoor Unit Communication Fault 179 - I had to FIX MY OWN UNIT MalikoBoost 12K views 2 years ago Carrier Infinity Air Purifier Maintenance Michigan Heating Guy 10K. On boot up the air handler info and the outdoor compressor must match in size. This error can be looked up in a manual to see what the meaning is. The error codes for diagnostics of this equipment can be found below in the form of a table. Communication issues are common, and could be caused by quite a few things. The Infinity Control Thermostat would intermittently show a "CRITICAL MALFUNCTION - INDOOR COMMUNICATION FAULT" on the display. But this is how you would go about. The indoor unit may come on but not the outdoor unit. Therefore, one should have such a table to hand. Carrier Fault Codes. The most common reason is due to a bad connection between the outdoor unit and the indoor unit. Mini Split Error Codes (Fujitsu, Carrier, Pioneer, Mitsubishi). Carrier infinity series code 179 came on. The outside unit was working but no communication with the. The next morning I restored power and everything worked properly. Carrier Infinity Indoor Unit Communication Fault 178 Check the wiring to the ABCD connector (those are the communication wires) on the outside unit. Frost forming on exterior refrigerant tubing or the outdoor unit Issues that can lead to a frozen evaporator coil include: Excessive buildup of dust, dirt or other pollutants on the. Aux heat works but the heat pump doesn't. Carrier thermostat error codes Error code 16 Fault description: System Commu-nications Failure Potential cause and action: Communication with the user interface lost. Carrier infinity code 179 ,outdoor unit communication fault, JustAnswer-Q&A 5. net">Carrier conditioner error codes. Check the circuit breakers in the circuit breaker box (or electrical panel), most likely mounted to an outside wall in the back of the house. Carrier Air Conditioner: P4, E4, E1 And Other Error Messages. The Carrier thermostats refer to the high-grade equipment. My thermostats says outdoor unit communication fault. Any ideas? Could it be the thermostat?. Carrier Mini Split Error Codes List – HVAC How To. Code 44 -- Motor Communication Fault (ventilator, humidifier, dehumidifier, outdoor unit will be turned off) Code 45 -- Control failure Furnace The code number represents flash code on circuit board of furnace. Carrier Air Conditioner Error Codes. Both indoor and outdoor communications faults showed as active. Outdoor unit has 240 vaults and the control board has 24 colts. If not, Disconnect all wires to ICM motor (16 & 5 pin connections). E4 – The indoor unit has a sensor for detecting the. Each wire should be connected to the right terminal and the connections have to be secure. (Make sure drain in airhandler or furnace is clear, float. If a fault code 179 appears on your Carrier Infinity thermostat, it indicates an outdoor unit communication error. Replace the access panel if necessary. - Next Press and hold the “Reset” button for another 3 seconds – this time there should be a light flash on the display. Inspect wiring to User Interface and the indoor & outdoor units Error code 25 Fault description: Invalid Model Plug. Have had recurring problems with communication faults. This can be caused by a loose wire or a problem with the communication board in the outdoor unit. Frost forming on exterior refrigerant tubing or the outdoor unit Issues that can lead to a frozen evaporator coil include: Excessive buildup of dust, dirt or other pollutants on the evaporator coil Excessively dirty or clogged air filter Excessive buildup of dust, dirt or debris on the outdoor condensing unit Low refrigerant levels. Thanks for viewing my question. Inspect wiring to User Interface and the indoor &. E2: Indoor outdoor units communication error. Both indoor and outdoor communications faults showed as active. Make sure all wires are tightly attached, and run to the appropriate terminal. I had this Carrier Infinity system installed by Sears in 2009, IIRC: - Heat Pump: 25HNA 1 Stage, 48KBTU. Causes are a wiring disconnect between components, main outdoor unit PCB board failure, indoor unit PCB board failure or a problem with the branch box (multizone systems). Carrier Fault Codes. My thermostats says outdoor unit communication fault. Code 33 -- Limit Circuit Fault AND high heat only is active. Carrier "Outdoor Unit Not Communicating". To clear the error: Check the wiring. That is determined by the plug In resistor board on the compressor control board. Infinity Control Won’t Detect the Outdoor Unit This is most likely a communication issue emanating from the ABCD connector. Outdoor communication fault means one of generally three things- The power is off to the outdoor unit, check the circuit breaker and the service disconnect; bad communication wire/connection between outdoor unit control board and indoor unit control board, inspect all control wiring connecting units; inverter (if it is inverter driven) is shot …. The wire I ran was approx 30-40' 18 gauge solid copper to the ac from zine control board. How to Reset a Carrier Air Conditioner 1. This typically only happened during rainstorms, but not every rainstorm, and it didn't seem related to lightning. E3: Indoor fan speed malfunction. The unit is less then a year old as well as the thermostat. If display says “Outdoor Unit Not Found” (two-stage communicating outdoor unit): Recheck wiring to ABCD connector on outdoor unit. Frost forming on exterior refrigerant tubing or the outdoor unit Issues that can lead to a frozen evaporator coil include: Excessive buildup of dust, dirt or other pollutants on the evaporator coil Excessively dirty or clogged air filter Excessive buildup of dust, dirt or debris on the outdoor condensing unit Low refrigerant levels. Carrier "Outdoor Unit Not Communicating". Code 41 -- Blower Motor Fault (cooling mode only) (ventilator, humidifier, dehumidifier, outdoor unit will be turned off) Code 45 -- Control Circuitry Lockout. I didn't spend much more time on it but I was in communication with the carrier tech and he said to out a 120ohm resistor between A and B on the ac unit abcd bus. PDF Infinity Evolution Troubleshooting Guide Rev2. Solutions: Replace the fuse or reset the circuit breaker using the recommended replacement fuse. RESULT: Indoor unit EEPROM parameter error; CODE: E1. The thermostat has lost communication with outdoor unit. Low voltage wiring in between thermostat, indoor unit, or outdoor unit bad or corroded connection. Carrier infinity code 179 ,outdoor unit communication fault, have switched circuit breaker on /off , control is calling for heat , so using indoor furnace, should i try changing to cool to confirm outdoor unit power. Carrier infinity code 179 ,outdoor unit communication fault, have switched circuit breaker on /off , control is calling for heat , so using indoor furnace, should i try changing to cool to confirm outdoor unit power. Carrier thermostat error codes Error code 16 Fault description: System Commu-nications Failure Potential cause and action: Communication with the user interface lost. Low voltage wiring in between thermostat, indoor unit, or outdoor unit bad or corroded connection 3. If thermostat wire checks out OK, check wiring inside the unit control box. A Carrier Outdoor Unit Communication Fault can occur for a number of reasons. The technician was here for two hours checking inside and outside unit. Carrier infinity code 179 ,outdoor unit communication fault, JustAnswer-Q&A 5. For each symptom or error code there are some recommendations, remedies or necessary actions. Carrier "Outdoor Unit Not Communicating". Ensure all wiring is tightly connected. PDF Communication Faults (Infinity/Evolution). Hi, 178 is an Indoor communication fault. After many return visits by techs from the installing company, no solution has been found. This can be caused by a loose wire or a problem with the communication board in the outdoor unit. a Carrier FE4A air handler with a 44 Error Code. It will be best to contact a carrier authorized company for service. Next step is to grab a multimeter and lets see if there is 24 volts at the outdoor unit from inside, The thermostat is telling us it is NO LONGER communicating with your outdoor unit. Carrier Infinity System Malfunction - Communication Fault. There could be fuses in the outdoor power. The Infinity Control Thermostat would intermittently show a "CRITICAL MALFUNCTION - INDOOR COMMUNICATION FAULT" on the display. (Make sure drain in airhandler or furnace is clear, float switch will kill comms if blocked) 2. The thermostat has lost communication with outdoor unit. If a problem is isolated to the outdoor unit (comm error only occurs when outdoor unit is connected to the bus), the problem may be in the thermostat wire, or the outdoor unit. The Carrier thermostats refer to the high-grade equipment. Carrier infinity fault codes – description and how to fix ">Carrier infinity fault codes – description and how to fix. Carrier infinity code 179 ,outdoor unit communication fault, have switched circuit breaker on /off , control is calling for heat , so using indoor furnace, should i try. Carrier infinity thermostat troubleshooting. E1: Communication between indoor and outdoor units. Bryant Evolution Outdoor Unit Communication Fault 179 - I had to FIX MY OWN UNIT MalikoBoost 4. Purchased the home in 2012 with the HVAC already installed. The most common reason is due to a bad. Have had recurring problems with communication faults. Infinity carrier outdoor unit communication fault My thermostats says outdoor unit communication fault. Carrier Outdoor Unit Communication Fault A loose or damaged wire anywhere in the system can cause an ‘outdoor unit communication’ fault. CARRIER 25VNA SERVICE MANUAL Pdf Download. Infinity Control Won’t Detect the Outdoor Unit This is most likely a communication issue emanating from the ABCD connector. For example, you may check the power supply or inspect some other functions. Unfortunately, errors can happen, which is usually displayed on the indoor wall unit. Be sure to comply with local codes while running a wire from the indoor unit to the outdoor unit. OUTDOOR FAULT. The thermostat has lost communication with outdoor unit. If this part of the system is not receiving any power, then it will not register. Communication Faults (Infinity/Evolution) Fan Coil board communicates to ICM motor all the time. Make sure all colors match for every terminal. Also, do check the outdoor circuit board– there shouldn’t be any blown fuses or tripped breakers. Hi Guys, I found this forum while searching for a clue as to why my A/C has failed. Hello! I have a new carrier infinity system. Communication and Status Function Lights 10 Troubleshooting 12 Fault Codes See also: Owner's Manual, Product Data 25VNA Infinityt Variable Speed Heat Pump with Greenspeedt Intelligence 2 to 5 Nominal Tons UNIT IDENTIFICATION. Jan 26, 2019 · Carrier infinity code 179,outdoor unit communication fault, 2 days, 2 days, filters good, have remove thermostat and – Answered by a verified HVAC Technician. Carrier infinity code 179 ,outdoor unit communication fault, have switched circuit breaker on /off , control is calling for heat , so using indoor furnace, should i try changing to cool to confirm outdoor unit power. Communication issues are common, and could be caused by quite a few things. If you feel comfortable working with electricity, then you. received this message: Carrier infinity code 179 ,outdoor…">I received this message: Carrier infinity code 179 ,outdoor…. Any idea what code 179 means other than ""Outdoor Unit Communication"? Did a wire get pulled loose? Contractor's Assistant: Anything else we. Troubleshoot an Air Conditioner. Indoor Error Codes List. Carrier Outdoor Unit Communication Fault A loose or damaged wire anywhere in the system can cause an ‘outdoor unit communication’ fault. carrier outdoor communication fault. com/hvac-repair/carrier-outdoor-unit-communication-fault-troubleshooting-guide/#Carrier Fault Code 179 Outdoor Unit Communication" h="ID=SERP,5652. If the heat pump needs serious repair or an action which you do not know how to do, care for your safety and call the specialists. Code 24 -- Secondary Voltage Fuse Open. 24K subscribers Subscribe 12K views 3 years ago A simple fix. Could be indoor board, outdoor board, any thermostat wire, or that thermostat itself. Check the resistance across the blue (RS-) & yellow (RS+) on motor It should measure 102-105 K Ohms on ½ & 1 h. An indoor or outdoor unit issue could be indicated by a green or orange LED flashing on and off. After many return visits by techs from the installing company, no solution has been found. Infinity carrier outdoor unit communication fault. If the wiring is okay, check float switch on inside unit of the drain line. Carrier Infinity Troubleshooting: Signs to Look Out For. E4: Indoor room temperature sensor (T1) malfunction. - Locate the “Reset” button on the control panel of the air conditioner. carrier infinity code 179 ,outdoor unit communication fault Just this morning I am getting a system malfunction 179 outdoor unit communication fault. Carrier Air Conditioning Error Code OLF(Outdoor LED Flash) ,OL (Operation Lamp ,TL(Timer Lamp) How to Reset a CarrierAir Conditioner 1. Outdoor EEPROM fault. New Member. NOTE: For codes 13, 14 and 21, the system will use heat pump. E5: Evaporator coil temperature sensor (T2) malfunction. On Sunday, September 23rd, I got a System Fault Error - Fault Code 179 (Outdoor Unit Communication Fault). 48: Lost Inverter Communications: 49: 230 VAC Dropout-Reset Event: 53: Outdoor Air Temp Sensor Fault: 54: Suction Temp Sensor Fault: 55: Coil Temp Sensor. Purchased the home in 2012 with the HVAC already installed. Use the arrows on the new filter to get the alignment right. Check the outdoor unit "disconnect switch" to make sure it is in the "ON" position. 39K subscribers Subscribe 1 Share 2K views 1 year ago From https://www. If it is tripped it will cause the unit not to. E3 – The indoor fan’s speed or the blower speed is not regular. A Carrier Outdoor Unit Communication Fault can occur for a number of reasons. Find the air filter (usually in the return air duct or on the indoor unit) Remove the access panel if necessary. I had this Carrier Infinity system installed by Sears in 2009, IIRC: - Heat Pump: 25HNA 1 Stage, 48KBTU. How to Program Carrier Infinity Thermostat One Schedule for All Days. Basically, even when the system displays that the connection has been lost with the outdoor unit, the actual loss might have happened either inside or outside. Make sure the wires are installed correctly. 2-38QHF092 38CMS051 to131 42-38LUVH025 to045N 42LUVH060K, 42LUVH070K, 42LUVH080K 42NQV050-060M Carreir G series Carrier Alpha Carrier Alpha-Inverter Carrier Ducted CP Carrier Elite - 055N, 065N and 075N Carrier Elite 025N-1, 035N-1, 045N-1, 055N-1, 065N-1, 075N-1 Carrier Fault Code 38VYX030,040 Carrier Multi 42CMD026-070. I couldn't dismiss the fault and the unit would shut down, killing the AC. Infinity carrier outdoor unit communication fault My thermostats says outdoor unit communication fault. Carrier 48VL-A Carrier 50EJ Carrier 50PD05. Both indoor and outdoor communications faults showed as active. Unfortunately I don't believe we internet people will be able to help. I didn't spend much more time on it but I was in communication with the carrier tech and he said to out a 120ohm resistor between A and B on the ac unit abcd bus. Carrier Air Conditioning Error Code OLF(Outdoor LED Flash) ,OL (Operation Lamp ,TL(Timer Lamp) How to Reset a CarrierAir Conditioner 1. Check that all configurations are okay Confirm the 24VAC connection between the C and D terminal connector of the outdoor unit Faulty Thermostat Have you noticed a change in air temperature control?. If a fault code 179 appears on your Carrier Infinity thermostat, it indicates an outdoor unit communication error. Their stylish design and simplicity of adjustment and indication of parameters of operation of the troubleshooting system, which is presented below in form of a table, show high quality standards of the equipment from Carrier. Display says “Outdoor Unit Not Found”, and. Just this morning I am getting a system malfunction 179 outdoor unit communication fault. Carrier Manuals Air Conditioner 40MAQ Service manual Carrier 40MAQ Series Service Manual High- wall ductless split system sizes 09 to 30 Also See for 40MAQ Series: User manual , Installation instructions manual (15 pages) , Owner's manual (11 pages) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36. Make sure they are all in the "ON" position. Could be indoor board, outdoor board, any thermostat wire, or that thermostat itself EatMyAssLikeA_Potato • 2 mo. Carrier thermostat fault codes and troubleshooting. (Check to make sure the drain isn't stopped up on the indoor unit) 2. Communication faults are the most difficult to troubleshoot as they are sometimes intermittent. If a problem is isolated to the outdoor unit (comm error only occurs when outdoor unit is connected to the bus), the problem may be in the thermostat wire, or the outdoor unit wiring. I do not know if the furnace control board has one. For example, an E1 error code on a Pioneer Mini Split means there is a problem with the Indoor/Outdoor unit’s communication. Restart the operation once the power has been restored. The unit stops working The unit works erratically A refrigerant leak The power cord is getting hot Compressor or coil malfunctions Burning smells Lack of cooling power that isn’t related to the thermostat Leaks Wiring and electrical issues Damaged power cord Frequent circuit breaker trips or fuse blows Strange or loud sounds. Every wire must be connected firmly. Tried turning the indoor system power off/on and the breaker but … read more. I gathered as much information as I can. carrier infinity error 179. ago Unfortunately I don't believe we internet people will be able to help. A technician from the company that I purchased the unit from came that night and stated that the following two parts needed to be replaced: Infinity Control Board and the Entire Inverter Drive. Infinity carrier outdoor unit communication fault. Carrier Infinity System Malfunction. It allows to decipher any error code and assign repair. Outdoor Light Flash times. Carrier Infinity System Malfunction - Communication Fault. Code 24 -- Secondary Voltage Fuse Open. It will be best to contact a carrier authorized company for service. I have a Carrier FE4A air handler with a 44 Error Code. Communication faults are the most difficult to troubleshoot as they are sometimes intermittent. I couldn't dismiss the fault and the unit would shut down, killing the AC. Carrier infinity code 179 ,outdoor unit communication fault, JustAnswer-Q&A 5. Carrier Outdoor Unit Communication. Carrier AC Indoor Unit Displays Error Code: F3 Error Code Definition: (Unit Size 18K – 24K – 30K) = Outdoor ambient temperature sensor malfunction Error Code Definition: (Unit Size 36K – 42K) =. Problem: The Infinity Control Thermostat would intermittently show a "CRITICAL MALFUNCTION - INDOOR COMMUNICATION FAULT" on the display. The unit stops working The unit works erratically A refrigerant leak The power cord is getting hot Compressor or coil malfunctions Burning smells Lack of cooling power that isn’t related to the thermostat Leaks Wiring and electrical issues Damaged power cord Frequent circuit breaker trips or fuse blows Strange or loud sounds. Carrier Outdoor Unit Communication Fault. Compressor Winding Fault or Outdoor unit control board has failed: 46: Brownout Event: 47: There is no 230v at the contactor when indoor unit is powered and cooling/ heating demand exists. 48:35 Carrier Inverter AC PCB Communication error repair | Qphix appliance repair | Qphix appliance repair 8. This can be caused by a loose wire or a problem with the # airconditioner # splitac # windowairconditioner #. Carrier Infinity Puron ac/hp shows zero at times for two of ">Carrier Infinity Puron ac/hp shows zero at times for two of. Make sure the wires are installed correctly and are not loose. Carrier Air Conditioning Error Code Solution. Carrier "Outdoor Unit Not Communicating". A Carrier Outdoor Unit Communication Fault can occur for a number of reasons. Outdoor Unit Communications Fault : r/hvacadvice. Communication faults are the most difficult to troubleshoot as they are sometimes intermittent. CARRIER INVERTER AIR CONDITIONER ERROR CODES – …. EE: Water level alarm malfunction (Only for cassette and duct types). carrier infinity code 179 ,outdoor unit communication fault Just this morning I am getting a system malfunction 179 outdoor unit communication fault. 59 Carrier AC error codes (FULL LIST). Indoor / outdoor units communication error. It says System Malfunction Fault Code: 179 UI: outdoor unit communication Can someone tell me what that exactly means? Im in Texas and its 95 outside. Next step is to grab a multimeter and lets see if there is 24 volts at the outdoor unit from inside, The thermostat is telling us it is NO LONGER communicating with your outdoor unit. On boot up the air handler info and the outdoor compressor must match in size. Outdoor unit control board has no led green or yellow lights. Carrier Manuals Air Conditioner 40MAQ Service manual Carrier 40MAQ Series Service Manual High- wall ductless split system sizes 09 to 30 Also See for 40MAQ Series: User manual , Installation instructions manual (15 pages) , Owner's manual (11 pages) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36. Call a professional HVAC technician. Hello! I have a new carrier infinity system. The most common reason is due to a bad connection between the outdoor unit and the. Code 44 -- Motor Communication Fault (ventilator, humidifier, dehumidifier, outdoor unit will be turned off) Code 45 -- Control failure Furnace The code number represents flash code on circuit board of furnace. See page 02-16 of the Fujitsu Service Manual for a troubleshooting. Outdoor unit control board has no led green or yellow lights. E1: Communication between indoor and outdoor units.