E920 on a Samsung heat pump: FSV SD Card Read Error
Short answer
On a Samsung heat pump, E920 means: FSV SD Card Read Error. The manual does not say whether the heat pump stops. 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 HT Quiet (AE***BXYD*G)
The manual says: FSV SD Card Read Error.
Part involved: PCB EEPROM / data memory.
When it shows: Unit self-diagnosis: FSV SD Card Read Error.
Likely causes:
- PCB memory (EEPROM/data flash) or option-setting data fault.
- Engineer checks per Samsung service manual: Check the micro SD card used for FSV (field setting) data upload.
On the EHS Mono R290 (AE***CXYD*K and pump-integrated AE***CXYB*K)
The manual says: FSV SD card data error.
Part involved: PCB EEPROM / data memory.
When it shows: Unit self-diagnosis: FSV SD card data error.
Likely causes:
- PCB memory (EEPROM/data flash) or option-setting data fault.
- Engineer checks per Samsung service manual: Check the micro SD card used for FSV (field setting) data upload.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
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 the micro SD card used for FSV (field setting) data upload. 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
- Samsung EHS Service Manual - Eco Heating System Outdoor Unit / Tank Integrated Hydro Unit (Split, Mono, Mono HT) Code AC-00242E_2 (Jul 2022) ↗ · AC-00242E_2 (2022 edition) · page ManualsLib viewer pp.105-106 (printed pp.102-103) · Reviewed 23 September 2026
- Air to Water Heat Pump User manual AE200DN**** / AE160DN**** / MIM-E03FN (2024 ClimateHub / control kit) DB68-12922A-05 ↗ · DB68-12922A-05 · page p.58 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026