Samsung EHS 101 fault code

What it means

Hydro unit ↔ outdoor unit communication error

The hydro unit and outdoor unit have stopped talking. Check the interconnect (F1/F2) before either board.

Safety: Safe isolation before opening terminal covers — mains present on the interconnect.

UK models this code applies to

From the Samsung service literature we hold (Samsung MWR-WW10N user & service manual DB68-08470A-17 (Appendix: error codes)) — not a scraped list.

Now the harder half: proving what caused it

101 names a symptom, not a root cause. In the app, the same code opens a guided investigation: what to measure first, the expected values for your exact model, and an honest verdict — including “nothing in this machine is broken” when that's what the readings say.