E201 on a Samsung heat pump: CONTROL KIT / Outdoor UNIT Communication Error (Matching Error)
Short answer
On a Samsung heat pump, E201 means: CONTROL KIT / Outdoor UNIT Communication Error (Matching Error). The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 3 sources
What it means
On the EHS Mono R290 (AE***CXYD*K and pump-integrated AE***CXYB*K)
The manual says: CONTROL KIT / Outdoor UNIT Communication Error (Matching Error).
Part involved: Hydro unit/control kit and outdoor PCB communication.
When it shows: Unit self-diagnosis: CONTROL KIT / Outdoor UNIT Communication Error (Matching Error).
Likely causes:
- Communication/addressing fault between hydro unit (control kit) and outdoor unit, or between outdoor PCBs: wiring fault, loose connector, incorrect setting, electrical interference or PCB failure.
- Engineer checks per Samsung service manual: Hydro unit/control kit quantity must match the outdoor unit 1:1; check the quantity setting, electrical connection and setting.
On the EHS Split Generation 4 (AEX/AEN, 2014)
The manual says: Control Kit quantity is mismatched.
Part involved: Hydro unit/control kit and outdoor PCB communication.
When it shows: Unit self-diagnosis: Control Kit quantity is mismatched.
Likely causes:
- Communication/addressing fault between hydro unit (control kit) and outdoor unit, or between outdoor PCBs: wiring fault, loose connector, incorrect setting, electrical interference or PCB failure.
- Engineer checks per Samsung service manual: Hydro unit/control kit quantity must match the outdoor unit 1:1; check the quantity setting, electrical connection and setting.
On the EHS Split R32 (AE***RXED*G)
The manual says: Hydro Unit / Outdoor Unit communication error(Matching error).
Part involved: Hydro unit/control kit and outdoor PCB communication.
When it shows: Unit self-diagnosis: Hydro Unit / Outdoor Unit communication error(Matching error).
Likely causes:
- Communication/addressing fault between hydro unit (control kit) and outdoor unit, or between outdoor PCBs: wiring fault, loose connector, incorrect setting, electrical interference or PCB failure.
- Engineer checks per Samsung service manual: Hydro unit/control kit quantity must match the outdoor unit 1:1; check the quantity setting, electrical connection and setting.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: unknown.
Manual reset: unknown.
What you can check
- Note the full error code shown on the controller; check the heat pump breaker/isolator in the consumer unit is ON; then contact your installer or Samsung service; Samsung manuals do not describe a homeowner reset for this code.
What the engineer will check
- Hydro unit/control kit quantity must match the outdoor unit 1:1; check the quantity setting, electrical connection and setting. Any work inside casings, on PCBs, wiring, sensors, pumps, valves or refrigerant is engineer-only.
Who to ask for: Heat pump engineer (Samsung-trained, controls/electrical).
Certification: Competent electrical worker (BS 7671) for work on live equipment.
What you might notice
Sources
- EHS R290 Mono Outdoor Unit Installation Manual AE***CXYD** (EU) DB68-12496A-03 ↗ · DB68-12496A-03 · page p.24 · Reviewed 23 September 2026
- Samsung Eco Heating System Service Manual - Outdoor Unit AEX060-160ED*HA / Hydro Unit AEN080/160YD*HA (file RC160MHXGA_SM_E_34513A(1)) ↗ · 34513A(1) · page ManualsLib viewer pp.52, 65 (printed pp.51, 64) · Reviewed 23 September 2026
- EHS R-32 Split Outdoor Unit Installation Manual (EU) DB68-08407A-06 ↗ · DB68-08407A-06 · page p.50 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026