Samsung Heat Pump Error Codes

Complete diagnostic guide for Samsung heat pumps in the United Kingdom.

Sensor and Temperature Errors

Error codes for Samsung heat pumps related to temperature sensor and probe problems.

Error Code	Meaning	Possible Causes	Solutions
901	Error: Temperature probe at PHE water inlet (open/short-circuited)	Temperature probe at PHE water inlet defective Sensor not properly connected Cable connection interrupted or short-circuited Sensor damaged	Check temperature probe at PHE water inlet for function Check wiring for proper connection Check sensor for short circuit or interruption Test sensor with multimeter Replace sensor if defective Contact qualified service
902	Error: Temperature probe at PHE water outlet (open/short-circuited)	Temperature probe at PHE water outlet defective Sensor not properly connected Cable connection interrupted or short-circuited Sensor damaged	Check temperature probe at PHE water outlet for function Check wiring for proper connection Check sensor for short circuit or interruption Test sensor with multimeter Replace sensor if defective Contact qualified service
903	Error: Temperature probe at water outlet (safety heater)	Temperature probe at water outlet defective Sensor not properly connected Cable connection interrupted or short-circuited Sensor damaged	Check temperature probe at water outlet for function Check wiring for proper connection Check sensor for short circuit or interruption Test sensor with multimeter Replace sensor if defective Contact qualified service
904	Error: DHW tank temperature probe	DHW tank temperature probe defective Sensor not properly connected Cable connection interrupted or short-circuited Sensor damaged	Check DHW tank temperature probe for function Check wiring for proper connection Check sensor for short circuit or interruption Test sensor with multimeter Replace sensor if defective Contact qualified service
906	Error: Temperature probe at PHE refrigerant gas inlet (open/short-circuited)	Temperature probe at PHE refrigerant gas inlet defective Sensor not properly connected Cable connection interrupted or short-circuited Sensor damaged	Check temperature probe at PHE refrigerant gas inlet for function Check wiring for proper connection Check sensor for short circuit or interruption Test sensor with multimeter Replace sensor if defective Contact qualified service
653	Wired remote control temperature probe short-circuited or open	Wired remote control temperature probe defective Sensor not properly connected Cable connection interrupted or short-circuited Sensor damaged	Check wired remote control temperature probe for function Check wiring for proper connection Check sensor for short circuit or interruption Test sensor with multimeter Replace sensor if defective Contact qualified service

Flow and Water Problems

Error codes for Samsung heat pumps related to flow, water filter and water supply problems.

Error Code	Meaning	Possible Causes	Solutions
911	Error: Flow switch and water filter	Flow switch defective Water filter blocked Insufficient water flow Problems with water supply	Check flow switch for function Check water filter for blockages and clean Check water flow Check water supply Replace filter if necessary Contact qualified service
912	Error: Flow switch and water filter	Flow switch defective Water filter blocked Insufficient water flow Problems with water supply	Check flow switch for function Check water filter for blockages and clean Check water flow Check water supply Replace filter if necessary Contact qualified service

Communication and System Errors

Error codes for Samsung heat pumps related to communication, memory and system component problems.

Error Code	Meaning	Possible Causes	Solutions
601	Error: Communication between hydro unit and wired remote control	Communication error between hydro unit and wired remote control Wiring damaged Defective control board Problems with data transmission	Check wiring between hydro unit and wired remote control Check control board for errors Check communication connections Restart system Contact qualified service if problem persists
604	Error: Communication monitoring between hydro unit and wired remote control	Communication monitoring disturbed Wiring damaged Defective control board Problems with data transmission	Check communication monitoring Check wiring between hydro unit and wired remote control Check control board for errors Restart system Contact qualified service if problem persists
654	Read/write error on EEPROM memory (data error on wired remote control)	EEPROM memory defective Data error on wired remote control Control board defective Problems with memory function	Check EEPROM memory Check wired remote control for data errors Check control board for errors Restart system Have control board replaced if necessary Contact qualified service
590	Error: Inverter EEPROM checksum	Inverter EEPROM checksum faulty EEPROM memory damaged Inverter defective Control board defective	Check inverter EEPROM Check checksum Test inverter function Check control board for errors Have inverter or control board replaced if necessary Contact qualified service

Safety and Refrigerant Errors

Error codes for Samsung heat pumps related to safety problems and refrigerant errors.

Error Code	Meaning	Possible Causes	Solutions
554	Error: Gas leakage	Refrigerant leakage Gas leakage detected Safety sensor activated Problems with refrigerant circuit	IMMEDIATELY: Ventilate room and switch off heat pump No ignition sources nearby Have refrigerant leakage checked by qualified service Do not attempt to repair yourself Contact qualified service for refrigerant Observe safety instructions

Need More Help?

If you are experiencing problems with your Samsung heat pump that are not covered by these error codes, or if the provided solutions do not resolve your issue, we recommend:

Consult your Samsung heat pump user manual for model-specific information
Visit the official Samsung support page: samsung.com/uk/support/
Contact Samsung customer service in the United Kingdom for technical support
Seek help from a qualified heat pump repair technician
Check warranty coverage if your heat pump is still under warranty

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