Samsung
The Samsung EHS Mono R32 is a monobloc air-source heat pump range offering 8kW to 14kW outputs, featuring a 70°C maximum flow temperature and full MCS certification for UK installations.
The Samsung EHS_R32_Mono_Installation_Guide_8_12_14kW range, covering 8kW, 12kW, and 14kW outputs, is a monobloc air-source heat pump system for UK domestic heating. Utilizing R32 refrigerant, these units achieve flow temperatures up to 70°C and operate in ambient conditions as low as -30°C. This technical reference provides engineers with installation data, hydraulic requirements, and a comprehensive fault code list for both single-phase and three-phase variants of the EHS Mono R32 series.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Samsung EHS Mono R32 series is a monobloc air-to-water heat pump system available in three primary capacities: 8kW, 12kW, and 14kW. These units are supplied in both single-phase (220-240V) and three-phase (380-415V) configurations to suit varying domestic and light commercial electrical infrastructures. A significant technical characteristic is the maximum flow temperature of 70°C, which facilitates compatibility with existing radiator systems, provided a full heat loss calculation is performed.
The outdoor units, such as the AE080BXYDEG, measure 1018mm in height, 1270mm in width, and 530mm in depth, with a chassis weight of 126kg. These dimensions require careful site planning, particularly regarding clearances. The installation manual specifies a minimum of 300mm at the rear and sides, with 1500mm of clear space at the front to ensure adequate airflow across the evaporator.
Hydraulic integration is managed via 25.4mm (1 inch) pipe connections. The system requires a minimum water flow rate of 7 litres per minute to prevent low-flow errors and ensure efficient heat transfer. The maximum operating pressure is rated at 2.9 bar, while the minimum is 1 bar. For systems where the total water volume is insufficient to manage defrost cycles or heat pump cycling, a buffer tank or volumiser may be necessary, though specific requirements depend on the total system volume and the selected control kit, such as the MIM-E03CN or MIM-E03EN.
The range utilizes R32 refrigerant, which has a Global Warming Potential (GWP) of 675. The factory charge is 2.7kg. Because these are monobloc units, the refrigerant circuit is hermetically sealed within the outdoor unit, meaning F-Gas qualification is required for the overall installation and maintenance, but no refrigerant pipework is handled on-site.
For UK installers, the EHS Mono R32 is MCS certified and eligible for the Boiler Upgrade Scheme (BUS). Sound emissions are managed through a quiet mode, with a standard sound pressure level of 42 dB at 1 metre for the 8kW variant. Maintenance protocols include an annual check of the glycol concentration and pH levels (which should remain above 8.0), alongside cleaning the internal water filter and inspecting the pressure relief valves.
Every fault code listed in the manufacturer brochure, with likely causes and engineer actions. Each code has a permalink — paste a URL like https://www.boilertag.com/heat-pumps/samsung/ae120bxydeg#fault-108 to jump straight to the entry.
| Code | Meaning | Details |
|---|---|---|
| 108 | Setting Address Duplicate Error | — |
| 120 | Zone2 Indoor Room Temperature Sensor Short/Open | — |
| 121 | Error of ROOM Temperature Sensor in Indoor unit short/open | — |
| 122 | Error of Evaporator_in Sensor of Indoor unit short/open | — |
| 123 | Error of Evaporator_out Sensor of Indoor unit short/open | — |
| 162 | Outdoor UNIT EEPROM Error | — |
| 163 | EEPROM OPTION SETTING Error | — |
| 177 | In hydro box, take place emerency signal Error | — |
| 201 | CONTROL KIT / Outdoor UNIT Communication Error (Matching Error) | — |
| 202 | CONTROL KIT / Outdoor UNIT Communication Error | — |
| 205 | Communication Error Between Outdoor Unit Inv Micom - Fan Motor Micom | — |
| 221 | Outdoor Temperature Sensor Error(open/short) | — |
| 231 | COND_OUT Main Temperature Sensor Error (open/short) | — |
| 241 | COND OUT Sensor of Outdoor Unit breakaway Error | — |
| 251 | Discharge Temperature Sensor Error (open/short) | — |
| 262 | Discharge Sensor breakaway Error | — |
| 266 | Comp Top Sensor breakaway Error | — |
| 269 | SUCTION Sensor breakaway Error | — |
| 276 | Compressor Top Temperature Sensor Error (open/short) | — |
| 291 | High Pressure Sensor Error (open/short) | — |
| 296 | Low Pressure Sensor Error (open/short) | — |
| 308 | Suction Sensor Error (open/short) | — |
| 321 | EVI Inlet Sensor Error (open/short) | — |
| 322 | EVI Outlet Sensor Error (open/short) | — |
| 403 | Protect for Freezing Control Error | — |
| 407 | COMP down due to High PressureSensor Protection Control | — |
| 410 | COMP down due to Low PressureSensor Protection Control | — |
| 416 | Comp down due to discharge Temperature | — |
| 425 | Outdoor Reverse Phase or Missing Phase Detect Error | — |
| 428 | COMP down by Compression Ratio control Error | — |
| 436 | Protect for Freezing Burst Control Error | — |
| 438 | EVI EEV Opening Error | — |
| 439 | Refrigerant Leakage Error (Detect when the system is not operated) | — |
| 440 | Forbid Heat mode Operation when Outdoor Temperature is over 43°C | — |
| 441 | Forbid Cooling Mode when OutdoorTemperature is Low 10°C | — |
| 443 | No startup due to Low pressure | — |
| 458 | Outdoor unit Fan Error | — |
| 461 | [Inverter] COMP Operating failure | — |
| 462 | All currency control COMP Stop Or CT2 Low currency | — |
| 464 | [Inverter] DC peak Error | — |
| 465 | Compressor V limit Error | — |
| 466 | [Inverter] DC-Link voltage under/over Error | — |
| 467 | COMP Revolute Error | — |
| 468 | [Inverter] Comp Current Sensor Error | — |
| 469 | DC Link Sensor Error | — |
| 471 | Outdoor unit EEPROM Read/Write Error(OTP error) | — |
| 474 | [Inverter] IPM Heat Sink Error | — |
| 475 | Outdoor unit BLDC Fan Error | — |
| 483 | H/W DC_link over voltage Error | — |
| 484 | PFC Overload Error | — |
| 485 | [Inverter] Input Current Sensor Error (open/short) | — |
| 488 | AC Input Voltage Sensor Error | — |
| 500 | IPM Overheat Error for Inverter COMP | — |
| 507 | Comp Down due to high pressure or High Pressure Switch Open | — |
| 563 | INDOOR UNIT Mixed Install Error | — |
| 590 | [Inverter] Data flash Error | — |
| 899 | Zone1 Tw Temperature Sensor Short/Open | — |
| 900 | Zone2 Tw Temperature Sensor Short/Open | — |
| 901 | Water Inlet Sensor Error (open/short) | — |
| 902 | Water Outlet Sensor Error (open/short) | — |
| 904 | Water TANK Sensor SHORT / OPEN | — |
| 906 | Outdoor EVA in Sensor Error (open/short) | — |
| 907 | Error due to pipe rupture protection | — |
| 908 | Error due to freeze prevention(Re-Operation is possible) | — |
| 909 | Error due to freeze prevention(Re-Operation is impossible) | — |
| 910 | Water Temperature Sensor on water Outlet pipe is datached | — |
| 911 | FLow Swtich Open Error | — |
| 912 | FLow Swtich Close Error | — |
| 913 | Six times detection for FLow Switch Error(Re-Operation is not possible) | — |
| 914 | Error due to Incorrect Themostat Connection | — |
| 915 | Error on DC fan(Non-operating) | — |
| 916 | Mixing Sensor Short/Open | — |
| 919 | Disinfection Operation Incomplete Error | — |
Patterns that group across the manufacturer's fault-code table. Each entry links to the full code listing further down the page.
Triggered by fault code 108.
Triggered by fault code 120.
Triggered by fault code 121.
Triggered by fault code 122.
Triggered by fault code 123.
Common questions from engineers and homeowners about the Samsung AE120BXYDEG.
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Specifications on this page are extracted from the manufacturer brochure. Always cross-check against the latest datasheet before commissioning or quoting. Last updated 30 April 2026.