Samsung Heat pump fault E904
Water tank sensor short/open
Heat pumpWhat it means
Water tank sensor has a short circuit or open circuit condition
Likely causes
- Water tank sensor wiring disconnected
- Water tank sensor short circuit
- Water tank sensor open circuit
- Sensor connector corrosion
Where to start
- Check water tank sensor connector for loose or corroded connections
- Measure sensor resistance with multimeter
- Inspect sensor wiring for damage or breaks
The full answer, free
- 3 more checks in order
- The readings and component tests from the manual
- How to put it right, step by step
- The manual page for this fault (page 85), right under the answer
Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.
From the Samsung manual for the Heat pump. Check the model on the data plate before you order parts.
Other Samsung Heat pump fault codes
- E906Outdoor EVA in sensor error
- E907Pipe rupture protection error
- E910Water temperature sensor detached
- E911Minimum water flow rate not met
- E912Flow switch close error
- E913Flow switch error detected six times (re-operation impossible)
- E914Incorrect thermostat connection
- E915DC fan non-operating
- E916Mixing sensor short/open