E471 on a Samsung heat pump: Outdoor unit EEPROM Read/Write Error(OTP error)
Short answer
On a Samsung heat pump, E471 means: Outdoor unit EEPROM Read/Write Error(OTP 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 · 4 sources
What it means
On the EHS Mono HT Quiet (AE***BXYD*G)
The manual says: Outdoor unit EEPROM Read/Write Error(OTP error).
Part involved: PCB EEPROM / data memory.
When it shows: Unit self-diagnosis: Outdoor unit EEPROM Read/Write Error(OTP error).
Likely causes:
- PCB memory (EEPROM/data flash) or option-setting data fault.
- Engineer checks per Samsung service manual: Check EEPROM data; check normal operation of PCB; exchange EEPROM or main PBA.
On the EHS Mono R290 (AE***CXYD*K and pump-integrated AE***CXYB*K)
The manual says: [Inverter] OTP Error → Outdoor unit EEPROM Read/Write Error (OTP error).
Part involved: PCB EEPROM / data memory.
When it shows: Unit self-diagnosis: [Inverter] OTP Error → Outdoor unit EEPROM Read/Write Error (OTP error).
Likely causes:
- PCB memory (EEPROM/data flash) or option-setting data fault.
- Engineer checks per Samsung service manual: Check EEPROM data; check normal operation of PCB; exchange EEPROM or main PBA.
On the EHS Mono (RC***MHX*A, R410A)
The manual says: [Inverter] OTP error.
Part involved: PCB EEPROM / data memory.
When it shows: Unit self-diagnosis: [Inverter] OTP error.
Likely causes:
- PCB memory (EEPROM/data flash) or option-setting data fault.
- Engineer checks per Samsung service manual: Check EEPROM data; check normal operation of PCB; exchange EEPROM or main PBA.
On the EHS Split Generation 4 (AEX/AEN, 2014)
The manual says: Outdoor EEPROM error.
Part involved: PCB EEPROM / data memory.
When it shows: Unit self-diagnosis: Outdoor EEPROM error.
Likely causes:
- PCB memory (EEPROM/data flash) or option-setting data fault.
- Engineer checks per Samsung service manual: Check EEPROM data; check normal operation of PCB; exchange EEPROM or main PBA.
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
- Check EEPROM data; check normal operation of PCB; exchange EEPROM or main PBA. Any work inside casings, on PCBs, wiring, sensors, pumps, valves or refrigerant is engineer-only.
Who to ask for: Heat pump engineer (Samsung-trained, PCB diagnostics).
Certification: Competent electrical worker (BS 7671).
What you might notice
What owners and engineers report
1 owner and engineer report mentions this.
- No heating on the EHS Mono HT Quiet (AE***BXYD*G): 1 report
Sources
- EHS R-32 Mono (HT Quiet) Outdoor Unit Installation Manual (EU) DB68-11904A-05 ↗ · DB68-11904A-05 · page p.46 · Reviewed 23 September 2026
- EHS R290 Mono Outdoor Unit Installation Manual AE***CXYD** (EU) DB68-12496A-03 ↗ · DB68-12496A-03 · page p.24 · Reviewed 23 September 2026
- Air to Water Heat Pump Mono Outdoor Unit installation manual RC***MHXGA / RC***MHXEA DB98-34411A(2) ↗ · DB98-34411A(2) · page p.37 · 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 p.53 (printed p.52) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026