E484 on a Samsung heat pump: PFC Overload Error
Short answer
On a Samsung heat pump, E484 means: PFC Overload Error. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: PFC Overload Error.
Part involved: Inverter PCB / compressor.
When it shows: Unit self-diagnosis: PFC Overload Error.
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 reactor in control box; if normal, exchange inverter 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; 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 reactor in control box; if normal, exchange inverter PBA. 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; R290 (A3 flammable refrigerant) competence.
Certification: Competent electrical worker (BS 7671); F-gas certification if refrigerant circuit is opened; R290/flammable refrigerant handling training (e.g. hydrocarbon refrigerant course).
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
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026