E470 on a Samsung heat pump: Outdoor unit EEPROM Read/Write Error
Short answer
On a Samsung heat pump, E470 means: Outdoor unit EEPROM Read/Write 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 · 2 sources
What it means
On the EHS Mono R32 (AE***RXYD*G)
The manual says: Outdoor unit EEPROM Read/Write Error.
Part involved: PCB EEPROM / data memory.
When it shows: Unit self-diagnosis: Outdoor unit EEPROM Read/Write Error.
Likely causes:
- PCB memory (EEPROM/data flash) or option-setting data fault.
- Engineer checks per Samsung service manual: Check outdoor unit EEPROM data loading; check PCB.
On the EHS Mono (RC***MHX*A, R410A)
The manual says: EEPROM read/write error.
Part involved: PCB EEPROM / data memory.
When it shows: Unit self-diagnosis: EEPROM read/write error.
Likely causes:
- PCB memory (EEPROM/data flash) or option-setting data fault.
- Engineer checks per Samsung service manual: Check outdoor unit EEPROM data loading; check PCB.
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 outdoor unit EEPROM data loading; check PCB. 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
7 owner and engineer reports mention this.
- No heating on the EHS Mono R32 (AE***RXYD*G): 6 reports
- Heat pump will not start on the EHS Mono R32 (AE***RXYD*G): 1 report
Sources
- EHS R-32 Mono Outdoor Unit Installation Manual (EU) DB68-08408A-07 ↗ · DB68-08408A-07 · page p.44 · 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
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026