Samsung
The Samsung NH200WHXEA is a 200-litre domestic hot water tank for EHS TDM heat pumps, featuring a 55 degree Celsius max flow temperature and R410A refrigerant compatibility.
The Samsung NH200WHXEA is a 200-litre domestic hot water tank designed for use with the Samsung EHS TDM air-to-water heat pump range. This split-system component integrates with hydro units like the NH080PHXEA or NH160PHXEA to provide dedicated hot water storage. Operating with R410A refrigerant, the system supports a maximum flow temperature of 55°C and maintains operation in outdoor temperatures as low as -20°C, ensuring reliable performance for UK residential heating and hot water applications.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Samsung NH200WHXEA serves as the dedicated storage solution within the Samsung EHS TDM (Time Division Multi) split heat pump ecosystem. As a 200-litre domestic hot water (DHW) tank, it is engineered to work in tandem with Samsung’s hydro units to deliver efficient hot water alongside space heating. The system utilizes R410A refrigerant, which has a Global Warming Potential (GWP) of 1975, and is designed for split-configuration installations where the refrigerant cycle is completed between the outdoor unit and the indoor hydro components.
Technical performance is centered on high-efficiency heat transfer. When paired with an 11kW system, the setup achieves a Coefficient of Performance (COP) of 4.55 at A7W35 conditions. This efficiency is supported by an inverter-driven compressor in the outdoor unit, allowing the system to modulate output based on demand. For domestic hot water production, the NH200WHXEA facilitates a maximum flow temperature of 55°C. This temperature threshold is sufficient for standard domestic requirements while maintaining the efficiency benefits of heat pump technology.
Installation requirements for the NH200WHXEA include integration with a wired remote controller, which provides weather compensation functionality. This feature adjusts the system's flow temperature based on external ambient conditions, optimizing energy consumption. The system is rated for operation in extreme climates, with a minimum outdoor operating temperature of -20°C. Hydraulic stability is critical; the system requires a minimum water flow rate of 12 litres per minute (LPM) for 8kW configurations, rising to 16 LPM for 16kW variants to prevent flow-related errors.
Maintenance and diagnostics are handled via a comprehensive set of fault codes displayed on the wired controller. Common issues often relate to thermistor performance, such as codes 901 (Water Inlet) and 904 (Water Tank), which indicate short or open circuits in the sensors. Engineers should verify thermistor resistance, typically 10kohm or 220kohm at 24°C depending on the specific sensor location. Flow-related issues are flagged by codes 911 and 912, which trigger if the flow switch remains off while the pump is active or vice versa. Annual servicing is required every 12 months, including refrigerant leak checks in accordance with F-Gas regulations, to ensure the long-term integrity of the R410A circuit and the hydraulic components within the 200-litre tank.
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/nh200whxea-2#fault-822 to jump straight to the entry.
| Code | Meaning | Details |
|---|---|---|
| 822 | EVA Inlet thermistor SHORT or OPEN Show causes & actionsLikely causes
Engineer action Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts. | Details |
| 823 | EVA Outlet thermistor SHORT or OPEN Show causes & actionsLikely causes
Engineer action Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts. | Details |
| 653 | Wired remote controller thermistor SHORT or OPEN Show causes & actionsLikely causes
Engineer action Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts. | Details |
| 654 | FRAM Read/Write Error(Wired remote controller data error) Show causes & actionsWrong data transmit B/W micom & IC07(eeprom) Likely causes
Engineer action Check communication and data transmission between micom and eeprom. | Details |
| 901 | Water Inlet thermistor SHORT or OPEN Show causes & actionsLikely causes
Engineer action Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts. | Details |
| 902 | Water Outlet thermistor SHORT or OPEN Show causes & actionsLikely causes
Engineer action Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts. | Details |
| 903 | PHE thermistor SHORT or OPEN Show causes & actionsLikely causes
Engineer action Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts. | Details |
| 904 | Water TANK thermistor SHORT or OPEN Show causes & actionsLikely causes
Engineer action Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts. | Details |
| 601 | Abnormal communication B/W Wired remote controller & Hydro unit Show causes & actionsLikely causes
Engineer action Check wiring and communication settings between the remote controller and the hydro unit. | Details |
| 604 | Communication tracking error B/W Wired remote controller & Hydro unit Show causes & actionsLikely causes
Engineer action Check wiring and communication settings between the remote controller and the hydro unit. | Details |
| 911 | Flow S/W OFF error Show causes & actionsIn case of flow S/W OFF in 10s during water pump signal is ON Likely causes
Engineer action Check water pump operation and flow switch status. | Details |
| 912 | Flow S/W OFF error Show causes & actionsIn case of flow S/W ON in 10s during water pump signal is OFF Likely causes
Engineer action Check water pump operation and ensure minimum flow rate (>12 LPM for NH080, >16 LPM for NH160). | Details |
Patterns that group across the manufacturer's fault-code table. Each entry links to the full code listing further down the page.
Engineer: Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts.
Triggered by fault code 822.
Engineer: Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts.
Triggered by fault code 823.
Engineer: Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts.
Triggered by fault code 653.
Common questions from engineers and homeowners about the Samsung NH200WHXEA.
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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.
Engineer: Check communication and data transmission between micom and eeprom.
Triggered by fault code 654.
Engineer: Check its resistance. 10kohm @ 24°C(Hydro unit), 220kohm@24°C(DHW Tank, Solar) Check its location as shown at the diagram. Check its contact status with pipe. Final solution is to change parts.
Triggered by fault code 901.