E536 on a Samsung EHS Mono R290: PHE refrigerant leakage error
Short answer
On a Samsung heat pump, E536 means: PHE refrigerant leakage 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: PHE refrigerant leakage error.
Part involved: Refrigerant circuit.
When it shows: Unit self-diagnosis: PHE refrigerant leakage error.
Likely causes:
- Refrigerant leakage/shortage detected, or service valve closed, sensor fault or installation error.
- Engineer checks per Samsung service manual: Check the plate heat exchanger for refrigerant leakage.
Is it safe?
Switch the heat pump off at its isolator and call an engineer.
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Safety lockout |
| 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; switch off at the isolator and keep ignition sources away from the outdoor unit; do not touch refrigerant pipework; 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 plate heat exchanger for refrigerant leakage. Any work inside casings, on PCBs, wiring, sensors, pumps, valves or refrigerant is engineer-only.
Who to ask for: F-gas certified refrigeration/heat pump engineer; R290 (A3 flammable refrigerant) competence.
Certification: F-gas certification (UK F-gas Regulation; e.g. City & Guilds 2079 Cat I); R290/flammable refrigerant handling training (e.g. hydrocarbon refrigerant course).
What you might notice
What owners and engineers report
1 owner and engineer report mentions this.
- Insufficient heating (house not warm enough) on the EHS Mono R290 (AE***CXYD*K and pump-integrated AE***CXYB*K): 1 report
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