Samsung Heat Pump Error Codes — Meanings, Causes & Repair in Greater Vancouver

Seeing a fault code on your Samsung heat pump? This guide explains what the most common Samsung heat pump error codes mean, what’s safe to check yourself, and when to call HeatLand’s licensed HVAC technicians for Samsung heat pump repair across Metro Vancouver and the Fraser Valley.

The codes below apply across common Samsung models (Wind-Free, Max Heat). Meanings follow Samsung’s documented fault codes — always confirm against your unit’s own manual, because exact wording can vary by model, control board and firmware.

How to read Samsung heat pump error codes

Samsung HVAC faults display as an E followed by a 3-digit number (e.g. E101, E154, E201, E458). The first digit groups the fault: E1xx = indoor unit (communication, indoor sensors, indoor fan, EEPROM), E2xx = communication / outdoor sensors, E4xx = outdoor unit (discharge over-temp, outdoor fan, compressor / inverter / DC-link), E5xx = system (refrigerant / capacity). On most ductless systems the code shows on the indoor unit display and/or as a blinking LED pattern on the indoor and outdoor PCBs.

Samsung heat pump error codes & what they mean

These are the Samsung heat pump codes our Greater Vancouver technicians see most. Anything marked pro repair involves electrical, refrigerant, sensor or control-board work that must be done by a licensed HVAC technician — never open the indoor/outdoor unit or refrigerant lines yourself.

Code	What it usually means	Common causes	Safe to check yourself
E101	Indoor-to-outdoor communication error: the indoor unit received no data from the outdoor unit within the timeout (about 1-5 minutes). Often caused by loss of power to the outdoor unit or a wiring/PCB fault on the F1-F2 communication line pro repair	Outdoor unit lost power or its breaker tripped; Loose, corroded, reversed or damaged F1/F2 communication wiring between indoor and outdoor units; Failed indoor or outdoor control PCB	Confirm both the indoor and outdoor units have power and no household breaker is tripped; Turn the system off at the breaker for a few minutes, then restore power once to allow a fresh start-up; Make sure nothing is leaning on or pulling the cable that runs between the indoor and outdoor units
E102	Communication error between the indoor control box and the outdoor unit (companion to E101). Indicates the link over the F1-F2 cable is not being established pro repair	Outdoor unit off or unpowered; Faulty or loose communication wiring; Indoor or outdoor PCB fault	Verify the outdoor unit has power and its breaker is on; Do a single power-off/power-on cycle at the breaker; Check that the disconnect switch near the outdoor unit is on
E121	Indoor room (air) temperature sensor error – the sensor is open or short circuited pro repair	Disconnected, pinched or damaged room temperature sensor wiring; Failed thermistor; Indoor PCB connector fault	Do one power-off/power-on cycle at the breaker to clear a transient fault; Confirm the indoor unit's front intake is not blocked
E122	Indoor evaporator (mid-pipe / coil inlet) temperature sensor error – sensor open or short circuited pro repair	Failed evaporator pipe thermistor; Loose or damaged sensor harness on the indoor coil; Indoor PCB connector fault	Do one power-off/power-on cycle at the breaker; Make sure the indoor air filter is clean and airflow is not restricted
E135	Indoor fan / airflow (PFC fan) sensor error pro repair	Faulty indoor fan feedback sensor or motor; Obstructed indoor fan wheel; Indoor PCB fault	Clean or replace the indoor air filter; Confirm nothing is blocking the indoor unit's air outlet or louvers; Do one power-off/power-on cycle at the breaker
E154	Indoor unit fan error – the indoor fan motor is not running at the expected speed or has stopped pro repair	Indoor fan motor failure or seized bearing; Obstruction in the indoor fan wheel; Loose fan motor connector	Clean or replace the indoor air filter; Confirm the supply louvers and air outlet are clear of furniture, curtains or debris; Do one power-off/power-on cycle at the breaker
E162	Indoor unit EEPROM error – the indoor PCB cannot read/write its stored configuration data pro repair	Corrupted or failed EEPROM on the indoor PCB; Indoor PCB requires replacement or re-programming	Do one power-off/power-on cycle at the breaker to confirm the fault is persistent
E163	Indoor unit option (option setting / configuration) error – the option code set on the indoor unit is missing or incorrect pro repair	Option code not set or set incorrectly after a PCB replacement; Indoor PCB configuration fault	Do one power-off/power-on cycle at the breaker
E186	MPI (multi-port / inter-board interface) error on the indoor unit pro repair	Internal indoor PCB communication fault; Loose internal harness between indoor boards	Do one power-off/power-on cycle at the breaker
E201	Outdoor-to-indoor communication / pairing error – after about 5 minutes the units cannot establish communication. On the outdoor unit it can also indicate an indoor-unit count or addressing problem; check the outdoor display for further fault detail pro repair	Outdoor unit lost power; Faulty or loose F1/F2 communication wiring; Outdoor PCB fault	Confirm the outdoor unit has power and its breaker/disconnect is on; Do a single power-off/power-on cycle at the breaker; Check that the cable running to the outdoor unit is not damaged or pulled loose
E202	Communication error between the indoor and outdoor unit – the outdoor unit received no data from the indoor unit within the timeout (about 1-5 minutes) pro repair	Indoor unit lost power; Faulty or loose F1/F2 communication wiring; Indoor or outdoor PCB fault	Confirm both units have power and no breaker is tripped; Do a single power-off/power-on cycle at the breaker; Verify the interconnecting cable is intact and not pinched
E203	Communication time-out between the inverter micom and the main micom on the outdoor PCB pro repair	Loose internal harness between the main and inverter control boards; Outdoor inverter or main PCB fault	Do one power-off/power-on cycle at the breaker to confirm the fault is persistent
E221	Outdoor (ambient) temperature sensor error – sensor open or short circuited pro repair	Failed outdoor air thermistor; Damaged or loose sensor wiring in the outdoor unit; Outdoor PCB connector fault	Clear leaves, snow and debris from around the outdoor unit; Do one power-off/power-on cycle at the breaker
E231	Condenser (outdoor coil) temperature sensor error – sensor open or short circuited pro repair	Failed condenser pipe thermistor; Loose or damaged sensor harness on the outdoor coil; Outdoor PCB connector fault	Clear the outdoor coil of leaves, snow and debris; Do one power-off/power-on cycle at the breaker
E237	Temperature sensor wiring/winding error on the outdoor unit (sensor connected incorrectly or wired to the wrong position) pro repair	Outdoor temperature sensors swapped or mis-wired; Loose sensor connectors after a repair	Do one power-off/power-on cycle at the breaker to confirm the fault is persistent
E251	Compressor discharge temperature sensor error – sensor open or short circuited pro repair	Failed discharge thermistor; Loose or damaged discharge sensor wiring; Outdoor PCB connector fault	Do one power-off/power-on cycle at the breaker; Clear debris from around the outdoor unit so it can cool normally
E320	Outdoor PCB (heat-sink / IPM) temperature sensor error – sensor open or short circuited pro repair	Failed heat-sink/IPM thermistor on the inverter board; Loose sensor connector on the outdoor PCB; Outdoor inverter PCB fault	Clear leaves and debris from around the outdoor unit so it can dissipate heat; Do one power-off/power-on cycle at the breaker
E416	Compressor discharge temperature too high (overheating) – the discharge sensor read above the safe limit and the unit shut down to protect the compressor pro repair	Low refrigerant charge or refrigerant leak; Restricted airflow over the outdoor coil (dirty coil, blocked airflow); Failed expansion valve / EEV	Clear all leaves, snow and debris from around the outdoor unit and from the coil fins; Make sure both indoor and outdoor units have unrestricted airflow; Clean or replace the indoor filter
E422	EEV (electronic expansion valve) or service valve closed error detected by self-diagnosis – the system senses the expansion valve or a service valve is not open/operating correctly pro repair	Closed liquid or gas service valve at the outdoor unit; Failed or stuck EEV; EEV coil or wiring fault	Do one power-off/power-on cycle at the breaker to confirm the fault is persistent
E440	Prohibited operating condition in heating mode – outdoor ambient temperature is outside the allowed range for heating, so the unit suspends operation to protect itself DIY-checkable	Outdoor temperature too high for heating mode operation; Outdoor temperature sensor reading out of range	Confirm you are requesting heating during appropriate outdoor temperatures; Allow the unit to resume automatically when conditions return to range; Verify the mode selected on the remote is correct
E441	Prohibited operating condition in cooling mode – outdoor ambient temperature is outside the allowed range for cooling, so the unit suspends operation to protect itself DIY-checkable	Outdoor temperature too low for cooling mode operation; Outdoor temperature sensor reading out of range	Confirm you are requesting cooling during appropriate outdoor temperatures; Allow the unit to resume automatically when conditions return to range; Verify the mode selected on the remote is correct
E458	Outdoor unit fan error – the outdoor fan motor is not running at the expected speed or has stopped pro repair	Outdoor fan motor failure or seized bearing; Ice, snow or debris jamming the outdoor fan blade; Loose fan motor connector	With the power off, visually check that leaves, snow or debris are not jamming the outdoor fan blade and clear them; Make sure there is clearance around the outdoor unit for airflow; Do one power-off/power-on cycle at the breaker
E461	Compressor starting error – the inverter compressor failed to start/spin up pro repair	Seized or faulty compressor; Low or out-of-range supply voltage; Inverter (IPM) PCB fault	Confirm household voltage is stable and the unit is on its own correctly rated breaker; Do one power-off/power-on cycle at the breaker
E462	AC input current limit / PFC overcurrent trip – the unit detected excessive input current or a power-factor-correction overcurrent and shut down pro repair	Overloaded compressor or restricted system; Supply voltage problem; Inverter / PFC PCB fault	Clear debris from around the outdoor unit so the system is not overworked; Confirm the unit is on a properly rated, dedicated breaker; Do one power-off/power-on cycle at the breaker
E464	IPM (inverter power module) overcurrent error – the inverter detected an overcurrent condition on the compressor drive and shut down pro repair	Failing compressor drawing high current; Inverter (IPM) module fault; Restricted system / overloaded compressor	Clear debris from around the outdoor unit; Confirm the unit is on a correctly rated dedicated circuit; Do one power-off/power-on cycle at the breaker
E465	Compressor voltage-limit / current-limit error – the compressor exceeded its voltage or current limit and the inverter protected itself pro repair	Failing compressor; Overloaded or restricted system; Inverter PCB fault	Clear debris from around the outdoor unit; Confirm stable supply voltage on a dedicated breaker; Do one power-off/power-on cycle at the breaker
E466	DC-link voltage under/over error – the inverter's DC bus voltage went below or above the safe range pro repair	Supply voltage too low or too high; Failed DC-link capacitor or inverter PCB; Power-supply / wiring fault	Confirm household voltage is stable and the unit is on a correctly rated dedicated circuit; Do one power-off/power-on cycle at the breaker
E467	Compressor wire missing / rotation error – the inverter detected an open compressor winding or that the compressor is not rotating correctly pro repair	Loose or disconnected compressor wire; Failed compressor winding; Inverter PCB fault	Do one power-off/power-on cycle at the breaker to confirm the fault is persistent
E468	Current sensor error – the inverter's current-sensing circuit is reading incorrectly pro repair	Failed current sensor on the inverter PCB; Inverter PCB fault	Do one power-off/power-on cycle at the breaker
E469	DC-link voltage sensor error – the circuit that measures the inverter DC bus voltage is faulty pro repair	Failed DC-link voltage-sensing circuit; Inverter PCB fault	Do one power-off/power-on cycle at the breaker
E471	OTP (one-time-programmable) memory error on the outdoor inverter PCB pro repair	Corrupted inverter PCB memory; Inverter PCB requires replacement	Do one power-off/power-on cycle at the breaker to confirm the fault is persistent
E472	AC input voltage zero-crossing error – the inverter cannot detect a valid AC line zero-crossing signal pro repair	Unstable or abnormal AC supply; Power-supply / wiring fault; Inverter PCB fault	Confirm the unit has stable household power on a properly rated dedicated circuit; Do one power-off/power-on cycle at the breaker
E473	Compressor blocking / locked-rotor error – the compressor is mechanically blocked or locked pro repair	Seized or locked compressor; Liquid refrigerant in the compressor; Inverter PCB fault	Do one power-off/power-on cycle at the breaker to confirm the fault is persistent
E554	Refrigerant (gas) leak detected – the system's self-diagnosis indicates a loss of refrigerant pro repair	Refrigerant leak in the indoor coil, outdoor coil, or line set; Loose flare connections; Undercharged system	Do one power-off/power-on cycle at the breaker to confirm the fault, then stop using the system and arrange service
E556	Capacity mismatch – the connected indoor and outdoor units have incompatible capacities or the option/capacity setting does not match pro repair	Indoor and outdoor units not a matched/compatible pair; Incorrect option or capacity code set on a PCB after replacement	Do one power-off/power-on cycle at the breaker to confirm the fault is persistent

Samsung heat pump codes we get called for most

E101 — Indoor-to-outdoor communication error: the indoor unit received no data from the outdoor unit within the timeout (about 1-5 minutes). Often caused by loss of power to the outdoor unit or a wiring/PCB fault on the F1-F2 communication line

Typical causes include outdoor unit lost power or its breaker tripped; loose, corroded, reversed or damaged f1/f2 communication wiring between indoor and outdoor units; failed indoor or outdoor control pcb. A few things are safe to check yourself (Confirm both the indoor and outdoor units have power and no household breaker is tripped; Turn the system off at the breaker for a few minutes, then restore power once to allow a fresh start-up), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes E101 on Samsung heat pumps throughout Greater Vancouver.

E121 — Indoor room (air) temperature sensor error – the sensor is open or short circuited

Typical causes include disconnected, pinched or damaged room temperature sensor wiring; failed thermistor; indoor pcb connector fault. A few things are safe to check yourself (Do one power-off/power-on cycle at the breaker to clear a transient fault; Confirm the indoor unit's front intake is not blocked), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes E121 on Samsung heat pumps throughout Greater Vancouver.

E203 — Communication time-out between the inverter micom and the main micom on the outdoor PCB

Typical causes include loose internal harness between the main and inverter control boards; outdoor inverter or main pcb fault. A few things are safe to check yourself (Do one power-off/power-on cycle at the breaker to confirm the fault is persistent), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes E203 on Samsung heat pumps throughout Greater Vancouver.

E554 — Refrigerant (gas) leak detected – the system's self-diagnosis indicates a loss of refrigerant

Typical causes include refrigerant leak in the indoor coil, outdoor coil, or line set; loose flare connections; undercharged system. A few things are safe to check yourself (Do one power-off/power-on cycle at the breaker to confirm the fault, then stop using the system and arrange service), but the repair is a licensed HVAC technician job. HeatLand diagnoses and fixes E554 on Samsung heat pumps throughout Greater Vancouver.

Is it safe to keep running a Samsung heat pump with a fault code?

Most Samsung fault codes put the heat pump into a safe lockout for a reason. You can safely check the basics — the power and breaker on, the indoor filter clean, the outdoor unit clear of snow, ice and debris, and the remote set to the correct mode and temperature — and restart it once. If the code returns, stop and book a technician. Mini-split and heat-pump faults are electrical and refrigerant issues — never open the indoor or outdoor unit, and never touch the wiring or refrigerant lines yourself.

Samsung heat pump repair across Greater Vancouver

HeatLand has kept Metro Vancouver homes comfortable since 1999. Our licensed, insured technicians diagnose and repair Samsung heat pumps — sensor and thermistor errors, indoor-to-outdoor communication faults, fan and compressor problems, refrigerant and pressure faults, and control-board issues — including units we didn’t install. We’re brand-agnostic, carry common parts, and give you an honest repair-or-replace assessment with upfront pricing and a free estimate. If your heat pump is beyond economical repair, we’ll show you right-sized, high-efficiency replacement options and the rebates available.

Need it sorted fast? We offer priority emergency heat pump repair. Explore Heat Pump services, browse all heat pump error codes by brand, or request a free estimate.

Samsung heat pump service areas

We repair Samsung heat pumps across Greater Vancouver and the Fraser Valley, including:

Samsung heat pump error code FAQs

Can I reset my Samsung heat pump myself?

Yes — power-cycling the unit at the breaker once is generally safe after you’ve checked the basics (the power and breaker on, the indoor filter clean, the outdoor unit clear of snow, ice and debris, and the remote set to the correct mode and temperature). If the heat pump faults again right away, stop and note the code — repeatedly resetting a heat pump that keeps locking out can mask a real problem. Call a licensed HVAC technician to diagnose it.

What does the Samsung E101 code mean?

On Samsung heat pumps, E101 commonly indicates indoor-to-outdoor communication error: the indoor unit received no data from the outdoor unit within the timeout (about 1-5 minutes). often caused by loss of power to the outdoor unit or a wiring/pcb fault on the f1-f2 communication line. Confirm the exact meaning against your unit’s manual — codes can vary by model and series — and have the repair done by a licensed HVAC technician. HeatLand fixes this across Greater Vancouver.

Do you repair Samsung heat pumps you didn’t install?

Yes. HeatLand is brand-agnostic and services Samsung heat pumps throughout Metro Vancouver and the Fraser Valley, whether or not we installed the unit. We carry common parts and give you an honest repair-or-replace assessment.

Is a Samsung heat pump fault code an emergency?

No heat in cold weather or no cooling in a heat wave is worth treating urgently. For priority heat pump repair across Greater Vancouver, call (604) 330-3812.

How much does Samsung heat pump repair cost in Vancouver?

It depends on the fault. Many Samsung codes point to sensors, thermistors, capacitors or control parts — usually far cheaper than replacement. We give upfront pricing and a free estimate before any work.

More Heat Pump error-code guides

HeatLand repairs every major heat pump brand across Greater Vancouver. More brand guides: