Heat pumps · Error codes · Samsung
E118Samsung · EHS TDM Plus (R410A)
E118 on a Samsung EHS TDM Plus: Indoor unit fan controller PCB overheat error
Short answer
On a Samsung heat pump, E118 means: Indoor unit fan controller PCB overheat 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: Indoor unit fan controller PCB overheat error.
Part involved: PCB.
When it shows: Unit self-diagnosis: Indoor unit fan controller PCB overheat error.
Likely causes:
- PCB overheat detected.
- Engineer checks per Samsung service manual: Check indoor unit fan controller PCB (overheat).
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 indoor unit fan controller PCB (overheat). Any work inside casings, on PCBs, wiring, sensors, pumps, valves or refrigerant is engineer-only.
Who to ask for: Heat pump engineer (electrical).
Certification: Competent electrical worker (BS 7671).
What you might notice
Sources
- EHS TDM (Plus) Outdoor Unit Installation Manual DB68-07002A-14 ↗ · DB68-07002A-14 · page p.47 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026