Carrier Infinity 25VNA0 Service Manual

Also see for Infinity 24VNA0: Owner's manual

2625VNA0 EVENT / FAULT (CONT.)OPERATIONFLASH CODE (AmberLED)RESET TIMEminutesHighest Priority (Code 1) FAULT Event(Message Displayed on User Interface)Heat or CoolMode Possible Causes ACTIONSystem Malfunction 84 240 HIGH PRESSURE LOCKOUT FOR 4HOURSBothOutside Normal Operating Range (e.g.improper load calculation, system matchissue, outside cooling range, outside heat-ing range etc) Consult Application GuidelinesLoose High Pressure Switch harnessleads Check HPS harnessPressure Switch disconnected from ODUControl Board Check HPS connection on ODU controlFaulty Pressure SwitchCheck Discharge pressure with gauge, ifless than 610 +/ --- 20 psig and switch isopen (measure resistance) then replacepressure switchRestriction due to debris leading to Over-charge when charging in Cooling modeClean System (refer to application guide-line) and replace filter drierRestriction in EXV plus Long Line Applica-tion leading to Overcharge when chargingin Cooling mode If long line, troubleshoot EXVNone condensable leading to high loadClean System (refer to application guide-line) and replace filter drierCoolService Valve left closed (Liquid or Vapor) Ensure Service Valves are openOvercharged SystemCheck system charge using CoolingCharging Mode (follow proper chargingprocedures)Outdoor Airflow too low or offCheck Outdoor Coil for clogging (ice ordebris) and clean or de ---ice if necessary;Troubleshoot Outdoor fan motor andmake sure it is working; follow OutdoorAirflow troubleshooting instructionRestriction in Filter Drier plus Long LineApplication and filter drier on Outdoor UnitClean System (refer to application guide-line) and replace filter drierRestriction in EXV plus Overcharge Troubleshoot EXVHeatFurnace plus Heat pump application: Fur-nace stuck onIf not in Defrost and Furnace is runningsame time as heatpump, troubleshootFurnaceRestriction in Filter Drier plus Long LineApplication and filter drier on Indoor UnitClean System (refer to application guide-line) and replace filter drierExpansion Orifice Restriction Troubleshoot TXVTroubleshoot EXVService Valve left closed (Vapor ServiceValve) Ensure Vapor Service Valve is openIndoor Airflow too low or offCheck Indoor for clogging (ice or debris)and clean or de ---ice if necessary; Trou-bleshoot Indoor fan motor and make sureit is working; follow Indoor Airflow trou-bleshooting instructionOvercharged SystemCheck charge in cooling (if in CoolingCharge Mode Ambient Range), if low addcharge using Charging Mode (followproper charging procedures); if out sidecooling charge mode range, pull outcharge, weigh in using heating chargemodeReversing Valve Stuck in Cooling troubleshoot reversing valveRestriction due to debrisClean System (refer to application guide-line) and replace filter drier