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Samsung · Heat pumps · Samsung EHS Mono R32 (air-to-water monobloc)

903Water outlet (backup heater) temperature sensor error.

Name in the manufacturer's documentation (service manual): Water outlet (backup heater) temperature sensor error.[1]

In plain words (editorial)

Error of the water outlet temperature sensor after the backup heater. The service manual checks the sensor connector on the PCB and measures the sensor resistance.

When to call a service technician: Contact an authorised Samsung service technician or your installer.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Samsung EHS R-32 Mono Outdoor (AE***RXYDEG/DGG) – Installation manual (DB68-08408A-07 (2024-01-10)) , p. 44 official manufacturer document quote verified 903 Water outlet (backup heater) temperature sensor error.
  2. [2] Samsung – Eco Heating System, Service Manual: Outdoor unit (Split AE..RXEDEG, Mono AE..RXYDEG) + Tank integrated hydro unit – 2019 (PDF copy from distributor climamarket.bg) , p. 79 manufacturer document – copy from a distributor quote verified restart the system after connecting to the pcb connector
  3. [3] Samsung – Eco Heating System, Service Manual: Outdoor unit (Split AE..RXEDEG, Mono AE..RXYDEG) + Tank integrated hydro unit – 2019 (PDF copy from distributor climamarket.bg) , p. 79 manufacturer document – copy from a distributor quote verified remove the temperature sensor connector from the pcb and measure the resistance between two terminals