Carrier Infinity 24VNA6 Series Service Manual

Also see for Infinity 24VNA6: Installation instructions Owner's manual

24VNA6 / 25VNA4: Service ManualManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.17Bluetooth ModuleThe Bluetooth module used with Carrier Service Tech App can collectrecent fault codes, monitor system operation, and update software. TheBluetooth module is connected to the PCM via a wire harness mountedon the bottom horizontal section of control panel and is centered over theplastic insert to maximize transmission range of module. See appropriatefault code description for Bluetooth Module related faults. Ifunsuccessful with pairing while fault is not active, see service app fortroubleshooting.DIAGNOSTIC CODES AND TROUBLESHOOTINGCode 13-53 System Control Upgrade Strongly RecommendedCode 13-82 System Control Upgrade RecommendedCode 13-53 indicates that the system control is sufficiently out of datethat the equipment will operate and that it is likely that the homeownerwill take notice of sub-optimal behavior.Code 13-82 indicates that the system control is out of date and should beupgraded to take full advantage of the features and functionality of theequipment system.To correct codes 13-53 or 13-82, upgrade the system control to the latestversion available.Code 14-94 Line Voltage LowLow line voltage may result in increased electronic componenttemperatures and shorten the life of VFD. Since control voltage is basedon line voltage, solenoids and relays may not pull in and hold correctlyas well. "Line Voltage Low" fault is set when incoming line voltagedrops below 180V AC RMS at any time, or when line voltage dropsbelow 185V AC RMS for more than 5 seconds. Once line voltageincreases above 187V, the fault will clear. While fault is active unit willnot operate or will shut down if already running. This fault does notescalate to a malfunction.This measurement is taken at the secondary side of 24V transformer anda scaler value applied at the factory to correct for transformer variation.Technician should first measure incoming line voltage at terminal block.Second, check tightness of all line voltage connections. Looseconnections can cause excessive voltage drop and trigger this fault. If allconnections are tight and line voltage is still low, additional stepsinvolving the local power utility or addition of external powerconditioner may be required.Code 15-94 Line Voltage HighHigh line voltage may result in increased stress on electroniccomponents and shorten the life of VFD. "Line Voltage High" fault is setwhen incoming line voltage rises above 285V AC RMS at any time, orwhen line voltage rises above 280V AC RMS for more than 5 seconds.Once line voltage drops below these thresholds the fault will clear.While fault is active unit will not operate or will shut down if alreadyrunning. This fault does not escalate to a malfunction.This measurement is taken at the secondary side of 24V transformer anda scaler value applied at the factory to correct for transformer variation.Technician should first measure incoming line voltage at terminal blockusing VOM. If voltage reading is below 285 VAC RMS, perform voltagecalibration steps using service app. If VOM measured voltage is above280VAC RMS, additional steps involving the local power utility oraddition of external power conditioner may be required.Code 17-06 Lost BTM CommunicationThe Bluetooth module used with Carrier Service Tech App can collectrecent fault codes, monitor system operation, and update software. TheBluetooth module is connected to PCM via wire harness and is mountedon the bottom horizontal section of control panel and is centered over theplastic insert to maximize transmission range of module. After unitpower up, the Bluetooth module will send periodic messages to PCMwhich confirm the status of module. If 2 consecutive minutes ofmessages are missing, code 17-06 will become active. Code 17-06 willclear when a single good message is received by PCM. If this fault isactive, inspect PCM to Bluetooth module harness and ensure both endsare fully seated on board header. Also inspect and repair any wiredamage on harness. If no green or red led is present on the Bluetoothmodule, disconnect harness at the Bluetooth module and check for 18-30VAC between pins 1 and 3 at the Bluetooth module connector end ofharness. If voltage is present and code is active, replace Bluetoothmodule. An active code 17-06 will not affect system operation in anyway except the service tool app will not connect to unit. If code iscleared and service app is not able to connect to Bluetooth module,follow troubleshooting steps in service app.Code 18-11 Indoor Coil Freeze ProtectionCode 18-11 indicates that the equipment is reducing compressor speedcompared to the requested capacity demand in an effort to prevent iceaccumulation on the indoor coil. The PCM monitors the saturatedsuction temperature at the compressor, and when the saturationtemperature approaches 32°F, the compressor speed is reduced until thesaturated suction temperature is above 32°F. If the compressor speedreduction is not able to achieve a saturated suction temperature above32°F then it will continue to operate until either demand is removed or a32-15 occurs.Code 18-11 has been activated in PCM software versions 5.0 and above.This fault is not active in PCM software versions less than 5.0Code 18-11 can be caused by insufficient airflow across the indoor coildue to a dirty filter or restrictive ductwork. Code 18-11 can also becaused by insufficient refrigerant charge in the system. Check the indoorequipment for excessive static air pressure and check refrigerant chargelevels to correct this fault.Code 24-58 5V PCM Power Out of Range LockoutThe PCM supplies 5V DC to VFD through the communication harnessto power low voltage IC's (pin 4 of 6 pin wire harness). If this voltage isinterrupted the VFD will cease to communicate with PCM. The PCMwill continue to operate for a short period of time in case thisinterruption is intermittent, but if the voltage is not restored the systemwill shut down and declare code 24-58. The fault will clear once 5V DCis restored to VFD via PCM communication harness. The 5VDC oncommunication harness is shared with 5VDC powering pressuretransducers.When code 24-58 is active disconnect PCM to VFD communicationharness and measure voltage between pin 3 (GND) and pin 4 (+5V DC)at the VFD connection end. If voltage is present, reconnect harness,power cycle, and check if fault is still present. If so, VFD will requirereplacement. If voltage is not present at VFD end of harness, check forvoltage at the PCM header. If voltage is not present there, Disconnect allother sensors from PCM until fault is cleared. Whichever sensor isdisconnected that makes fault disappear should be inspected for damage,likely a short exists in the harness. Once all sensors are disconnected andfault is present, confirm 5VDC is not present on PCM board, if not thenreplace PCM.Code 25-22 Model Plug MissingCode 25-62 Model Plug Missing LockoutThe Model Plug Missing Fault and Malfunction indicate that a modelplug is not presently installed on the PCM or was not present whenpower was applied to the equipment. If a valid model plug haspreviously been installed, the PCM will have the most recently installedmodel plug value stored in memory.Code 25-22 indicates that a valid model plug value is present in memory,but a model plug is not currently installed. If a Code 25-22 is active, theequipment will operate properly provided that the model plug value inmemory corresponds to the equipment model. To clear Code 25-22,remove power from the equipment, install the model plug correspondingto the equipment model, and reapply power to the equipment.Code 25-62 indicates that a valid model plug was not present when theequipment was powered up, and there is no valid model plug valuestored in PCM memory. If a Code 25-62 is active, the equipment willnot operate. The PCM will not acknowledge a new model pluginstallation while power is applied to the equipment. To clear Code25-62, remove power from the equipment, install the model plugcorresponding to the equipment model, and reapply power to theequipment. Code 25-62 can only be cleared by having a valid modelplug installed when power is applied to the equipment.