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Samsung Heat Pump Error Codes
155 error codes for Samsung heat pump models. Each links to the full diagnostic procedure from the service manual.
CodeDescription
ChCompressor preheating in progressE101Outdoor temperature sensor open or short circuit.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.E107Low pressure sensor open or short circuit.E108Compressor 1 sump temperature sensor open or short circuit.E109COND OUT sensor open or short circuit.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…E119Communication error between indoor and outdoor unit (when not received in every…MyPros+ Max
Get the full diagnostic procedure for any Samsung heat pump error code.
- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts
- Verified part numbers when replacement is required
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E120Communication error between indoor unit and outdoor unit (pre-tracking failure…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…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…E155Communication error between indoor and outdoor unit during tracking…E156Communication error between main outdoor unit and sub MICOM or between outdoor…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…E161Loading failure of digital compressor or OLP trip detected when temperature and…E185Compressor low current errorE186Compressor over current errorE2Tracking errorE201Tracking errorE201_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 controlE205Loading failure.E206Compressor down by discharge temperature sensorE207COND OUT sensor breakaway detected during heating operation based on…E208Suction temperature sensor breakawayE251Digital compressor discharge temperature sensor breakawayE252Fixed 1 compressor discharge temperature sensor breakaway.E253Fixed 2 compressor discharge temperature sensor breakaway.E254Fixed 3 compressor discharge temperature sensor breakaway (sub outdoor unit).E262Compressor discharge temperature sensor breakawayE263Compressor discharge temperature sensor breakawayE264Compressor discharge temperature sensor breakawayE301Fan motor high temperature errorE302Low pressure sensor error (open/short)E303Fan motor IPM high temperature errorE304CT over-current errorE305Fan motor reverse rotation errorE401COND 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…E405CT low current errorE406Suction temperature sensor breakawayE412Compressor down by high pressure protection controlE415Compressor down by low pressure protection controlE416Prohibit starting by low pressureE422Oil valve (equal oil valve) 1 self diagnosis errorE425Detection of reverse phase or missing phase of 3-phase powerE440Compressor down by indoor unit freezing protection controlE441Compressor sump temperature protection controlE442Compressor down by compressor discharge temperature sensor detecting over 135°C.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…E470Indoor unit EVAP OUT sensor breakaway detected via temperature differential…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)E483Fixed compressor 2 sump temperature sensor breakaway.E484Fixed compressor 3 sump temperature sensor breakaway.E485Fixed compressor 1 discharge temperature sensor breakawayE486Fixed compressor 2 discharge temperature sensor breakaway.E487Fixed compressor 3 discharge temperature sensor breakaway.E501Oil valve (equal oil valve) 1 self-diagnosis errorE502Indoor unit EVAP IN sensor error (open/short).E503Indoor unit EVAP OUT sensor error (open/short).E504Indoor unit outlet temperature sensor error (open/short)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 breakawayE554Compressor sump temperature (oil temperature) sensor breakawayE556Detection 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)P4Reverse phase or missing phase error detected on 3-phase power supply to the…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)U200Communication error between outdoor unit main and sub MICOM or communication…U201Communication error between outdoor unit main and sub MICOM or between outdoor…U202Communication error between outdoor unit main and sub MICOM or between outdoor…U203Communication error between outdoor unit main and sub MICOM or between outdoor…