Error code reference

Samsung Heat Pump Error Codes

401 error codes documented with diagnostic procedures.

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AxIndoor unit EVAP IN sensor breakaway error (x = indoor unit address).BxElectronic expansion valve open error (x = indoor unit address)ChCompressor preheating in progressCxElectronic expansion valve open error for xth indoor unitDxOPEN/SHORT error of EVAP IN sensor in indoor unit (x = indoor unit address).E1System down due to communication error after completion of trackingE101Communication error between the indoor unit and the wired remote panel (PAC).E102Compressor down by high pressure protection controlE103Fixed compressor 1 discharge temperature sensor open or short circuit.E104Compressor down by low pressure protection controlE105Fixed compressor 3 discharge temperature sensor open or short circuit.E106High pressure sensor open or short circuit.E107Simultaneous breakaway of indoor unit EVAP IN/OUT sensor.E108Compressor 1 sump temperature sensor open or short circuit.E109Auxiliary (electric) heater sensor 2 error.E110Oil balance sensor 1 open or short circuit.E111Suction sensor open or short circuit.E112Double pipe sensor open or short circuit.E113Reverse phase or missing phase detected on 3-phase power.E114Instant power off errorE115Forbid heat mode operation when outdoor temperature is over 30°C.E116Prohibit starting by low pressureE117Forbid operation by low pressureE118Equal oil valve 1 self diagnosis error (open or close error, sensor breakaway or defect).E119Communication error between indoor and outdoor unit (when not received in every room…E120Communication error between indoor unit and outdoor unit (pre-tracking failure or…E121Detection of reverse phase or missing phase of 3-phase powerE122Compressor down by indoor unit freezing protection controlE123Compressor down by low pressure protection controlE124Compressor down by indoor unit freezing protection controlE125Forbid operation due to low pressureE126Equal oil valve 1 self-diagnosis error (open or close error, sensor breakaway or defect).E127Compressor down by discharge temperature sensorE128Outdoor temperature sensor errorE129Suction temperature sensor breakawayE130COND MID temperature sensor error (open/short) on outdoor unit heat exchanger.E131Digital compressor discharge temperature sensor error (open/short).E132Constant speed compressor 1 discharge temperature sensor error (open/short).E133Constant speed compressor 2 discharge temperature sensor error (open/short).E134Oil temperature sensor error (open/short).E135Equal oil temperature sensor error (open/short).E136Dual-pipe temperature sensor error (open/short).E145Compressor sump temperature protection controlE151Instant power-off errorE152Fan motor RPM errorE153Fan motor IPM high temperature errorE154Prohibit compressor starting due to outdoor temperature exceeding allowed range (heat…E155Communication error between indoor and outdoor unit during tracking (pre-tracking failure…E156Communication error between main outdoor unit and sub MICOM or between outdoor units.E157Switch option setting error (not applied).E158Compressor down by compression ratio controlE159Fan motor over current errorE160Prohibit compressor start due to outdoor temperature out of range (cooling prohibited…E161Loading failure of digital compressor or OLP trip detected when temperature and pressure…E162The 2nd MCU SOL V/V cooling/heating opening at the same time.E163The 2nd MCU SOL V/V error.E164No change of EVAP IN temperature during the piping check.E165No change of EVAP OUT temperature during the piping check.E166Change of EVAP IN temperature detected on other indoor unit during piping check.E167Change of EVAP OUT temperature detected on other indoor unit during piping check.E170There is no change of EVAP IN temperature during the piping check.E171There is no change of EVAP OUT temperature during the piping check.E172There is a change of EVAP IN temperature of other indoor unit during the piping check.E173There is a change of EVAP OUT temperature of other indoor unit during the piping check.E181No change of EVAP IN temperature during the piping check.E182No change of EVAP OUT temperature during the piping check.E183Change of EVAP IN temperature of other indoor unit during the piping check.E184Change of EVAP OUT temperature of other indoor unit during the piping check.E185Compressor low current errorE186Compressor over current errorE2Tracking errorE201Tracking error-mismatch between the number of indoor units detected during communication…E201_commCommunication error between indoor unit and outdoor unit during tracking.E202Compressor down by low pressure protection controlE203Compressor down by indoor unit freezing protection controlE204Compressor down by sump temperature protection controlE205Indoor unit connected with confluence kit without continuity.E206Compressor down by discharge temperature sensorE207COND OUT sensor breakaway detected during heating operation based on temperature…E208Suction temperature sensor breakawayE209Rotary switch for indoor unit address in MCU was overlapped among MCUs.E210DIP switch for indoor unit setting was ON position even though indoor unit was not…E211DIP switch for indoor unit setting was ON position even though indoor unit was not…E212DIP switch for indoor unit setting was OFF position even though indoor unit was connected.E221Outdoor temperature sensor OPEN/SHORT error.E222Outdoor temperature sensor breakaway.E223COND-OUT MAIN temperature sensor error OPEN/SHORT.E224COND-OUT SUB 1 temperature sensor error OPEN/SHORT.E225COND-MID sensor breakaway of outdoor unit.E226COND-OUT 1 breakaway.E231PWM discharge temperature sensor error OPEN/SHORTE232Fixed capacity compressor 1 discharge sensor error OPEN/SHORTE233Fixed capacity compressor 2 discharge sensor error OPEN/SHORTE234Fixed capacity compressor 3 discharge sensor error OPEN/SHORTE235COND-MID sensor breakaway of outdoor unit.E236COND-OUT 1 sensor breakaway.E241PWM DISCHARGE TEMP sensor error OPEN/SHORTE251Digital compressor discharge temperature sensor breakawayE252Fixed capacity compressor 2 discharge sensor error OPEN/SHORTE253Fixed capacity compressor 3 discharge sensor error OPEN/SHORTE254Fixed 3 compressor discharge temperature sensor breakaway (sub outdoor unit).E261Digital discharge sensor breakaway.E262Compressor discharge temperature sensor breakaway-difference between digital compressor…E263Compressor discharge temperature sensor breakaway-difference between digital compressor…E264Compressor discharge temperature sensor breakaway-difference between digital compressor…E265Fixed 3 discharge sensor breakaway.E266Sump Sub 1 breakaway error.E267Sump Sub 1 breakaway error.E268Sump Sub 2 breakaway error.E269Sump Sub 3 breakaway error.E270Suction breakaway error.E271SUMP TEMP DIGITAL sensor error OPEN/SHORTE272SUMP TEMP FIXED 1 sensor error OPEN/SHORTE273SUMP TEMP FIXED 2 sensor error OPEN/SHORTE274SUMP TEMP FIXED 3 sensor error OPEN/SHORTE275High pressure sensor error OPEN/SHORTE276Low pressure sensor error OPEN/SHORTE277High pressure sensor breakaway.E278Low pressure sensor breakaway.E279Suction temperature sensor error OPEN/SHORT.E280Main cooling solenoid valve open error.E281SUMP TEMP DIGITAL sensor error OPEN/SHORTE282SUMP TEMP FIXED 1 sensor error (OPEN/SHORT)E283SUMP TEMP FIXED 2 sensor error (OPEN/SHORT)E284SUMP TEMP FIXED 3 sensor error (OPEN/SHORT)E291High pressure sensor error OPEN/SHORTE292Low pressure sensor error OPEN/SHORTE293High pressure sensor breakaway.E294Low pressure sensor breakaway.E295Suction temperature sensor error (OPEN/SHORT).E296Main cooling solenoid valve open error.E2974-Way valve operation error.E3Indoor unit float switch errorE301Fan motor high temperature errorE302Low pressure sensor error (open/short)E303Fan motor IPM high temperature errorE304CT over-current errorE305Fan motor reverse rotation errorE306COND-OUT 1 sensor breakaway.E307PWM DISCHARGE TEMP sensor error OPEN/SHORT. Detected when outdoor temperature is over…E308Fixed capacity compressor 1 discharge sensor error OPEN/SHORTE309Fixed capacity compressor 2 discharge sensor error OPEN/SHORT. Detected when outdoor…E310Fixed capacity compressor 3 discharge sensor error OPEN/SHORT. Detected when outdoor…E311PWM discharge temperature sensor error OPEN/SHORTE312SUMP TEMP FIXED 1 sensor error OPEN/SHORT. Detected when outdoor temperature is over…E313Fixed capacity compressor 2 discharge sensor error OPEN/SHORTE314Fixed capacity compressor 3 discharge sensor error OPEN/SHORTE315High pressure sensor error OPEN/SHORTE316Low pressure sensor error OPEN/SHORTE320Main cooling solenoid valve open error.E321SUMP TEMP DIGITAL sensor error OPEN/SHORT (detected when outdoor temp over -10°C; over…E322SUMP TEMP FIXED 1 sensor error OPEN/SHORT (detected when outdoor temp over -10°C; over…E323SUMP TEMP FIXED 2 sensor error OPEN/SHORT (detected when outdoor temp over -10°C; over…E324SUMP TEMP FIXED 3 sensor error OPEN/SHORT (detected when outdoor temp over -10°C; over…E331High pressure sensor OPEN/SHORT error (SHORT below 0.4V, OPEN over 4.2V; detected when…E332Low pressure sensor OPEN/SHORT error (SHORT below 0.4V, OPEN over 4.7V; detected when…E333High pressure sensor breakaway.E334Low pressure sensor breakaway.E335Suction temperature sensor OPEN/SHORT error.E336Main cooling solenoid valve open error.E3374-Way valve operation error.E341SUMP TEMP DIGITAL sensor error OPEN/SHORTE342SUMP TEMP FIXED 1 sensor error OPEN/SHORTE343SUMP TEMP FIXED 2 sensor error OPEN/SHORTE344SUMP TEMP FIXED 3 sensor error OPEN/SHORTE351High pressure sensor error OPEN/SHORTE352Low pressure sensor error OPEN/SHORTE353High pressure sensor breakaway.E354Low pressure sensor breakaway.E355Suction temperature sensor ERROR (OPEN/SHORT).E356Main cooling solenoid valve open error.E3574-Way valve operation error.E4Setting error of option switch in indoor unitE401COND OUT sensor breakaway detected during heating operationE402Indoor heat exchanger EVAP IN sensor breakawayE403Compressor down by compression ratio controlE404Compressor sump temperature (oil temperature) sensor breakaway for digital compressor or…E405CT low current errorE406Suction temperature sensor breakawayE407PWM DISCHARGE TEMP sensor error OPEN/SHORTE408Fixed capacity compressor 1 DCHRG sensor error OPEN/SHORTE409Fixed capacity compressor 2 DCHRG sensor error OPEN/SHORTE410Fixed capacity compressor 3 DCHRG sensor error OPEN/SHORTE411Compressor down by low pressure sensor protection control 2.E412Compressor down by high pressure protection controlE413Outdoor unit overload 3 protection control error.E414Outdoor unit SUMP DOWN 2 protection control.E415Compressor down by low pressure protection controlE416Prohibit starting by low pressureE417Outdoor unit discharge temperature 2 protection control.E418Outdoor unit discharge temperature 3 protection control.E419Outdoor unit EEV open 1 self diagnosis error.E420SUMP TEMP DIGITAL sensor error OPEN/SHORTE421SUMP TEMP FIXED 1 sensor error OPEN/SHORTE422SUMP TEMP FIXED 2 sensor error OPEN/SHORTE423SUMP TEMP FIXED 3 sensor error OPEN/SHORTE424High pressure sensor error OPEN/SHORTE425Detection of reverse phase or missing phase of 3-phase powerE426Outdoor unit reverse phase detection 2 error.E427Outdoor unit reverse phase detection 3 error.E428Outdoor unit compression rate 1 error (compression ratio over 8.5 for more than 5…E429Main cooling solenoid valve open error.E430Outdoor unit compression rate 3 error.E431Outdoor unit compression rate 1 errorE432Cooling mode operation forbidden when outdoor temperature below -5°C.E433Refrigerant charging operation restriction at 15°C or above outdoor temperature in…E434Instant power off error (disappears when compressor runs).E440Compressor down by indoor unit freezing protection controlE441Compressor sump temperature protection controlE442Compressor down by compressor discharge temperature sensor detecting over 135°C.E443Instant power offE451Outdoor unit discharge temperature 1 protection control.E452Outdoor unit discharge temperature 2 protection control.E453Outdoor unit discharge temperature 3 protection control.E461Detection of floating switch of indoor unit drain pump (1st detection)E462Outdoor unit fan motor RPM errorE463Indoor unit EVAP OUT sensor open or short error.E464Outdoor unit fan motor IPM high temperature errorE465Compressor over current error (compression ratio)E466Compressor low current errorE467Indoor unit EEV close failure (2nd detection)E468Digital compressor loading failure or OLP trip detectedE469Indoor unit EVAP IN sensor breakaway detected via temperature differential conditions…E470Indoor unit EVAP OUT sensor breakaway detected via temperature differential conditions…E471Instant power-off errorE472Indoor unit EV close error (2nd detection)E473Indoor unit EEV open failure (2nd detection)E474Indoor unit EVAP IN sensor breakaway detected during operation.E475Indoor unit EVAP OUT sensor breakaway detected during operation.E476Digital compressor 1 sump temperature sensor breakawayE477Fixed compressor 1 sump temperature sensor breakaway.E478Fixed compressor 2 sump temperature sensor breakaway.E479Fixed compressor 3 sump temperature sensor breakaway.E480Fixed compressor 1 discharge temperature sensor breakaway.E481Indoor unit EV open error (1st detection)E482Indoor unit EV open error (2nd detection)E483Refrigerant charging operation restriction at over 15°C outdoor temperature in heating…E484Instant power offE485Fixed compressor 1 discharge temperature sensor breakawayE486Fixed compressor 2 discharge temperature sensor breakaway.E487Fixed compressor 3 discharge temperature sensor breakaway.E5Setting error of option switch for peripheral equipment controlE501Oil valve (equal oil valve) 1 self-diagnosis errorE502Low discharge pressureE503Refrigerant charging operation restriction at over 15°C outdoor temperature in heating…E504Indoor unit outlet temperature sensor error (open/short)E505Full leakage of refrigerant of outdoor unit.E506Low pressure detection error at initial compressor start (low pressure below compressor…E508Outdoor temperature sensor error (open/short).E509Digital compressor discharge temperature sensor error (open/short).E511Oil collection operation in progressE512Constant speed compressor discharge temperature sensor error (open/short)E513High pressure sensor error (open/short).E514Low pressure sensor error (open/short).E515Oil temperature sensor error (open/short).E516Equal oil temperature sensor error (open/short).E517COND OUT temperature sensor error (open/short).E518Dual-pipe temperature sensor error (open/short).E519COND MID temperature sensor error (open/short) on outdoor unit heat exchanger.E551Indoor heat exchanger EVAP IN sensor breakawayE552Indoor heat exchanger EVAP OUT sensor breakawayE553Equability (oil leveling) operationE554Compressor sump temperature (oil temperature) sensor breakawayE555Full leakage of refrigerant of outdoor unit.E556Detection of floating switch of indoor unit drain pump (1st detection)E557Detection of floating switch of indoor unit drain pump (2nd detection)E558Suction temperature sensor breakawayE561Digital compressor discharge temperature sensor breakawayE562Fixed 1 compressor discharge temperature sensor breakaway.E563Fixed 2 compressor discharge temperature sensor breakaway (sub outdoor unitE564Fixed 3 compressor discharge temperature sensor breakaway (sub outdoor unit).E601Oil collection operation modeE602Indoor unit EV close error (1st detection)E603Indoor unit EV close error (2nd detection)E604Indoor unit EV open error (1st detection)E605Indoor unit EV open error (2nd detection)FxSimultaneous breakaway of indoor unit EVAP IN and EVAP OUT sensor (x = indoor unit…G2Total leakage of refrigerant in outdoor unit or compressor loading failure.G3Breakaway of COND MID sensor in outdoor unit.G4Breakaway of OIL temperature sensor (detected once or more times)G5Breakaway of SUCTION sensorG6Breakaway of fixed compressor discharge sensor (detected once or more times)G7Outdoor unit freezing detection (indoor unit heat exchanger below -4°C for over 40…G8No heating operationG9OPEN/SHORT error of EVAP OUT sensor in indoor unit (x = indoor unit address).P0System down due to high temperature of discharge sensor (discharge temperature exceeding…P1System down due to high temperature of COND sensor (condensate temperature of compressor…P2SUMP COMP DOWNP3System down due to low pressure switch detection (low pressure lower than 1.2 kg/cm2G…P4Reverse phase or open phase errorP431Forbid heating mode operation when outdoor temperature over 30°C.P432Forbid cooling mode operation when outdoor temperature below -5°C.P434Instant power off (disappears when compressor runs).P466Indoor unit floating switch error (1st detection)P467Indoor unit EEV close failure (1st detection).P468Indoor unit EEV open failure (1st detection).P471Indoor unit floating switch error (1st detection)P472Indoor unit EEV close failure (1st detection)P473Indoor unit EEV open failure (1st detection)P5System down due to frozen heat exchangerP501Outdoor unit freezing detection 1.P502Low discharge pressure (high pressure of 9 kg/cm² for 10 minutes).P503Outdoor unit freezing detection 3P504Outdoor unit overload 1 protection control error.P505Outdoor unit overload 2 protection control error.P506Outdoor unit overload 3 protection control error.P507Compressor down by high pressure sensor protection control 1.P508Compressor down by high pressure sensor protection control 2.P509Compressor down by high pressure sensor protection control 3.P510Compressor down by low pressure sensor protection control 1.P511Compressor down by low pressure sensor protection control 2.P512Compressor down by low pressure sensor protection control 3.P513Outdoor unit SUMP DOWN 1 protection control.P514Outdoor unit SUMP DOWN 2 protection control.P515Outdoor unit SUMP DOWN 3 protection control.P516Outdoor unit discharge temperature 1 protection control.P517Outdoor unit discharge temperature 2 protection control.P518Outdoor unit discharge temperature 3 protection control.P519Outdoor unit EEV open 1 self diagnosis error.P520Outdoor unit EEV open 2 self diagnosis error.P521Outdoor unit EEV open 3 self diagnosis error.P522Outdoor unit EEV close 1 self diagnosis error.P523Outdoor unit EEV close 2 self diagnosis error.P524Outdoor unit EEV close 3 self diagnosis error.P525Outdoor unit reverse phase detection 1 error.P526Outdoor unit reverse phase detection 2 error.P527Outdoor unit reverse phase detection 3 error.P528Outdoor unit compression rate 1 error.P529Outdoor unit compression rate 2 error.P530Outdoor unit compression rate 3 error.P6Error of momentary power failureP7Error of momentary power failureP701Float switch detection error (low level riskP702Compressor down by high pressure sensor protection control 2.P703Compressor down by high pressure sensor protection control 3.P704Outdoor unit overload 1 protection control error.P705Outdoor unit overload 2 protection control error.P706Outdoor unit overload 3 protection control error.P707Compressor down by high pressure sensor protection control 1.P708Compressor down by high pressure sensor protection control 2.P709Compressor down by high pressure sensor protection control 3.P710Compressor down by low pressure sensor protection control 1.P711Compressor down by high pressure sensor protection control 1.P712Compressor down by high pressure sensor protection control 2.P713Outdoor unit SUMP DOWN 1 protection control (SUMP temperature maintains over 95°C for 5…P714Outdoor unit SUMP DOWN 2 protection control.P715Outdoor unit SUMP DOWN 3 protection control.P716Outdoor unit discharge temperature 1 protection control.P717Outdoor unit discharge temperature 2 protection control.P718Outdoor unit discharge temperature 3 protection control.P721Outdoor unit SUMP DOWN 1 protection controlP722Compressor down by low pressure sensor protection control 2.P723Compressor down by low pressure sensor protection control 3.P731Outdoor unit SUMP DOWN 1 protection controlP732Outdoor unit discharge temperature 2 protection control.P733Outdoor unit discharge temperature 3 protection control.P741Outdoor unit discharge temperature 1 protection control.P742Outdoor unit discharge temperature 2 protection control.P743Outdoor unit discharge temperature 3 protection control.P751Outdoor unit EEV open 1 self diagnosis error.P752Outdoor unit EEV open 2 self diagnosis error.P753Outdoor unit EEV open 3 self diagnosis error.P754Outdoor unit EEV close 1 self diagnosis error.P755Outdoor unit EEV close 2 self diagnosis error.P756Outdoor unit EEV close 3 self diagnosis error.P761Outdoor unit reverse phase detection 1 error.P762Outdoor unit reverse phase detection 2 error.P763Outdoor unit reverse phase detection 3 error.P771Outdoor unit compression rate 1 errorP772Outdoor unit compression rate 2 error.P773Outdoor unit compression rate 3 error.P781Forbid heating mode operation when outdoor temperature over 30°C.P782Forbid cooling mode operation when outdoor temperature below -5°C.P783Refrigerant charging operation restriction at 15°C or over of outdoor temperature in…P784Instant power offP8Compressor down due to protection control of low pressure sensor (low pressure less than…P801Float S/W detection error (low level riskP802Indoor unit EEV closing error (low level riskP803Indoor unit EEV opening error (low level riskP804MCU solenoid valve failure (low level riskP9Compressor down due to low pressure sensor protection control (less than 3 kg/cm²G in…PACompressor down due to protection control of condensation ratio (compression ratio…qxOPEN/SHORT error of room sensor in indoor unit (x = indoor unit address).rxCooling operation forbidden when outdoor temperature is below -5°C (flickering display).sxHeating operation forbidden when outdoor temperature is over 30°C, or charging…t1Error of outdoor temperature sensor (OPEN/SHORT)t2Error of condenser temperature sensor (OPEN/SHORT)t3Error of PWM discharge temperature sensor (OPEN/SHORT)t4Error of liquid refrigerant pipe (COND OUT) temperature sensor (OPEN/SHORT)t5Error of oil temperature sensor (OPEN/SHORT)t6Error of suction temperature sensor (OPEN/SHORT)t7Error of high pressure sensor (OPEN/SHORT)t8Error of low pressure sensor (OPEN/SHORT)t9Error of fixed compressor discharge sensor (OPEN/SHORT)toOver 30°C when heatingtuBelow -5°C when coolingU200Communication error between outdoor unit main and sub MICOM or communication error…U201Communication error between outdoor unit main and sub MICOM or between outdoor units.U202Communication error between outdoor unit main and sub MICOM or between outdoor units.U203Communication error between outdoor unit main and sub MICOM or between outdoor units.vxIndoor unit fan motor starting error (x = indoor unit address).

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