What it means
Samsung's control kit manual says: 'Normal flow rate error: in case of normal flow rate in 10min during water pump signal is OFF'. The Installer Reference Guide calls it 'Flow Switch Close Error'.
What to check, in order
- Note what else is running
If your system has another pump, for example on a boiler or a second heating zone, note whether it was running when E912 appeared. Samsung's service manual lists 'Check the extra pump' as a check.
- Write the code down
Note the code and the time it appeared for your installer.
When to call your installer
Call your installer. Samsung's service manual has the engineer check the flow sensor connector on the main board (PBA) and check for an extra pump in the water circuit, then replace the flow sensor or the main board if needed.
A repair visit will usually check the pump, the filters and strainers, trapped air and the flow sensor.
- Note the model and serial number. They're on a label on the rating plate on the outdoor unit, and on the indoor unit or cylinder.
- Write down the exact code, and what the appliance was doing when it appeared.
- Check whether it's still under warranty. If it is, the repair may cost you nothing.
Quick answers
What does the Samsung E912 error code mean?
The flow sensor is reporting normal water flow even though the heat pump's own pump should be off. Something else is moving water through the unit, or the sensor or board is at fault. Samsung's control kit manual says: 'Normal flow rate error: in case of normal flow rate in 10min during water pump signal is OFF'. The Installer Reference Guide calls it 'Flow Switch Close Error'.
Can I fix Samsung E912 myself?
Engineer only (engineer visit). Start with: note what else is running; write the code down. Call your installer. Samsung's service manual has the engineer check the flow sensor connector on the main board (PBA) and check for an extra pump in the water circuit, then replace the flow sensor or the main board if needed.
Is Samsung E912 worth repairing?
Worth fixing. It can come from another pump in the system or from the flow sensor or board. The installer needs to find which.
Checked against
- Samsung MIM-E03CN EHS control kit installation manual (PDF), 'Water pump & flow sensor: E911, E912' (ManualsLib copy)
- Samsung MIM-E03CN EHS control kit installation manual (PDF), error codes part 2 (ManualsLib copy)
- Samsung EHS Mono (R32) Installer Reference Guide (PDF), troubleshooting of error codes (ManualsLib copy)
- Samsung EHS (AE080RXYDEG, AE080BXYDGG and others) service manual (PDF), water pump and flow sensor error E912 (ManualsLib copy)
Last reviewed October 2026. Manufacturers update their pages, and your manual is the final word. Spotted a mistake? Email contact@appliance-error-codes.com.