E463 on a Samsung heat pump: OLP over heat and comp stop
Short answer
On a Samsung heat pump, E463 means: OLP over heat and comp stop. 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 HT Quiet (AE***BXYD*G)
The manual says: OLP over heat and comp stop.
Part involved: Inverter PCB / compressor.
When it shows: Unit self-diagnosis: OLP over heat and comp stop.
Likely causes:
- Inverter/compressor drive fault: supply voltage issue, compressor wiring/winding, IPM/PFC/sensor fault on inverter PCB, refrigerant or airflow problem causing overcurrent/overheat.
- Engineer checks per Samsung service manual: Check OLP sensor and refrigerant charge.
On the EHS Mono R32 (AE***RXYD*G)
The manual says: OLP is overheated.
Part involved: Inverter PCB / compressor.
When it shows: Unit self-diagnosis: OLP is overheated.
Likely causes:
- Inverter/compressor drive fault: supply voltage issue, compressor wiring/winding, IPM/PFC/sensor fault on inverter PCB, refrigerant or airflow problem causing overcurrent/overheat.
- Engineer checks per Samsung service manual: Check OLP sensor and refrigerant charge.
On the EHS Split Generation 4 (AEX/AEN, 2014)
The manual says: Over current trip / PFC over current error (check OLP sensor).
Part involved: Inverter PCB / compressor.
When it shows: Unit self-diagnosis: Over current trip / PFC over current error (check OLP sensor).
Likely causes:
- Inverter/compressor drive fault: supply voltage issue, compressor wiring/winding, IPM/PFC/sensor fault on inverter PCB, refrigerant or airflow problem causing overcurrent/overheat.
- Engineer checks per Samsung service manual: Check OLP sensor and refrigerant charge.
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; check the outdoor unit is not blocked by leaves, debris or snow and air can flow freely; then contact your installer or Samsung service; Samsung manuals do not describe a homeowner reset for this code.
What the engineer will check
- Check OLP sensor and refrigerant charge. Any work inside casings, on PCBs, wiring, sensors, pumps, valves or refrigerant is engineer-only.
Who to ask for: Heat pump engineer with electrical and refrigeration competence.
Certification: Competent electrical worker (BS 7671); F-gas certification if refrigerant circuit is opened.
What you might notice
What owners and engineers report
13 owner and engineer reports mention this.
- Intermittent fault on the EHS Mono HT Quiet (AE***BXYD*G): 2 reports
- Keeps stopping / cutting out on the EHS Mono HT Quiet (AE***BXYD*G): 1 report
- No heating on the EHS Mono HT Quiet (AE***BXYD*G): 1 report
- No heating on the EHS Mono R32 (AE***RXYD*G): 6 reports
- Keeps stopping / cutting out on the EHS Mono R32 (AE***RXYD*G): 2 reports
- Intermittent fault on the EHS Mono R32 (AE***RXYD*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
- EHS R-32 Mono Outdoor Unit Installation Manual (EU) DB68-08408A-07 ↗ · DB68-08408A-07 · page p.43 · 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.52 (printed p.51) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026