Error code reference
Samsung Heat Pump Error Code E155
Communication error between indoor and outdoor unit during tracking (pre-tracking failure or different unit…
Communication error between indoor and outdoor unit during tracking (pre-tracking failure or different unit number between set units and indoor units).
First step from the service manual
1
Compare setting switch's indoor unit installation number with actual indoor units; press reset key (K3) and re-track.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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E155 on my Samsung Heat Pump
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Communication error between indoor and outdoor
From Service Manual 325966, p.18:
1.Compare setting switch's indoor unit installation number with actual indoor units; press reset key (K3) and re-track.
2.Measure door lock assembly resistance across the PTC terminals. Expected: ~200 ohms cold, rising sharply once energized.
3.Inspect strike and latch alignment. A warped door or misaligned strike prevents the switch stack from closing in the correct sequence.
Part DC34-00024B
Door lock assembly
Related Samsung heat pump codes
All Samsung heat pump codes →- ChCompressor preheating in progress
- E101Outdoor temperature sensor open or short circuit.
- E102Compressor down by high pressure protection control
- E103Fixed compressor 1 discharge temperature sensor open or…
- E104Compressor down by low pressure protection control
- E105Fixed compressor 3 discharge temperature sensor open or…
- E106High pressure sensor open or short circuit.
- E107Low pressure sensor open or short circuit.
View all 154 Samsung heat pump codes
- 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 error
- E115Forbid heat mode operation when outdoor temperature is over…
- E116Prohibit starting by low pressure
- E117Forbid operation by low pressure
- E118Equal oil valve 1 self diagnosis error (open or close…
- E119Communication error between indoor and outdoor unit (when…
- E120Communication error between indoor unit and outdoor unit…
- E121Detection of reverse phase or missing phase of 3-phase power
- E122Compressor down by indoor unit freezing protection control
- E123Compressor down by low pressure protection control
- E124Compressor down by indoor unit freezing protection control
- E125Forbid operation due to low pressure
- E126Equal oil valve 1 self-diagnosis error (open or close…
- E127Compressor down by discharge temperature sensor
- E128Outdoor temperature sensor error
- E129Suction temperature sensor breakaway
- E130COND MID temperature sensor error (open/short) on outdoor…
- E131Digital compressor discharge temperature sensor error…
- E132Constant speed compressor 1 discharge temperature sensor…
- E133Constant speed compressor 2 discharge temperature sensor…
- E134Oil temperature sensor error (open/short).
- E135Equal oil temperature sensor error (open/short).
- E136Dual-pipe temperature sensor error (open/short).
- E145Compressor sump temperature protection control
- E151Instant power-off error
- E152Fan motor RPM error
- E153Fan motor IPM high temperature error
- E154Prohibit compressor starting due to outdoor temperature…
- E156Communication error between main outdoor unit and sub MICOM…
- E157Switch option setting error (not applied).
- E158Compressor down by compression ratio control
- E159Fan motor over current error
- E160Prohibit compressor start due to outdoor temperature out of…
- E161Loading failure of digital compressor or OLP trip detected…
- E185Compressor low current error
- E186Compressor over current error
- E2Tracking error
- E201Tracking error
- E201_commCommunication error between indoor unit and outdoor unit…
- E202Compressor down by low pressure protection control
- E203Compressor down by indoor unit freezing protection control
- E204Compressor down by sump temperature protection control
- E205Loading failure.
- E206Compressor down by discharge temperature sensor
- E207COND OUT sensor breakaway detected during heating operation…
- E208Suction temperature sensor breakaway
- E251Digital compressor discharge temperature sensor breakaway
- E252Fixed 1 compressor discharge temperature sensor breakaway.
- E253Fixed 2 compressor discharge temperature sensor breakaway.
- E254Fixed 3 compressor discharge temperature sensor breakaway…
- E262Compressor discharge temperature sensor breakaway
- E263Compressor discharge temperature sensor breakaway
- E264Compressor discharge temperature sensor breakaway
- E301Fan motor high temperature error
- E302Low pressure sensor error (open/short)
- E303Fan motor IPM high temperature error
- E304CT over-current error
- E305Fan motor reverse rotation error
- E401COND OUT sensor breakaway detected during heating operation
- E402Indoor heat exchanger EVAP IN sensor breakaway
- E403Compressor down by compression ratio control
- E404Compressor sump temperature (oil temperature) sensor…
- E405CT low current error
- E406Suction temperature sensor breakaway
- E412Compressor down by high pressure protection control
- E415Compressor down by low pressure protection control
- E416Prohibit starting by low pressure
- E422Oil valve (equal oil valve) 1 self diagnosis error
- E425Detection of reverse phase or missing phase of 3-phase power
- E440Compressor down by indoor unit freezing protection control
- E441Compressor sump temperature protection control
- E442Compressor down by compressor discharge temperature sensor…
- E461Detection of floating switch of indoor unit drain pump (1st…
- E462Outdoor unit fan motor RPM error
- E463Indoor unit EVAP OUT sensor open or short error.
- E464Outdoor unit fan motor IPM high temperature error
- E465Compressor over current error (compression ratio)
- E466Compressor low current error
- E467Indoor unit EEV close failure (2nd detection)
- E468Digital compressor loading failure or OLP trip detected
- E469Indoor unit EVAP IN sensor breakaway detected via…
- E470Indoor unit EVAP OUT sensor breakaway detected via…
- E471Instant power-off error
- E472Indoor unit EV close error (2nd detection)
- E473Indoor unit EEV open failure (2nd detection)
- E474Indoor unit EVAP IN sensor breakaway detected during…
- E475Indoor unit EVAP OUT sensor breakaway detected during…
- E476Digital compressor 1 sump temperature sensor breakaway
- E477Fixed 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 breakaway
- E486Fixed compressor 2 discharge temperature sensor breakaway.
- E487Fixed compressor 3 discharge temperature sensor breakaway.
- E501Oil valve (equal oil valve) 1 self-diagnosis error
- E502Indoor 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…
- E511Oil collection operation in progress
- E512Constant speed compressor discharge temperature sensor…
- 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…
- E551Indoor heat exchanger EVAP IN sensor breakaway
- E552Indoor heat exchanger EVAP OUT sensor breakaway
- E554Compressor sump temperature (oil temperature) sensor…
- E556Detection of floating switch of indoor unit drain pump (1st…
- E557Detection of floating switch of indoor unit drain pump (2nd…
- E558Suction temperature sensor breakaway
- E561Digital compressor discharge temperature sensor breakaway
- E562Fixed 1 compressor discharge temperature sensor breakaway.
- E563Fixed 2 compressor discharge temperature sensor breakaway…
- E564Fixed 3 compressor discharge temperature sensor breakaway…
- E601Oil collection operation mode
- E602Indoor 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…
- 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…
- U201Communication error between outdoor unit main and sub MICOM…
- U202Communication error between outdoor unit main and sub MICOM…
- U203Communication error between outdoor unit main and sub MICOM…
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