What it means
Samsung's control kit manual: 'Error that the set temperature for disinfection operation is not reached, or, after reaching, the temperature fails to continue for the requested time'.
What to check, in order
- Avoid hot taps during the cycle
Samsung's installer guide says disinfection can fail if hot water is drawn during it, or if a lot is used just before it starts. It should run when no hot water use is expected.
- Don't stop the tank mid-cycle
Samsung says not to stop tank operation manually while disinfection is running.
- Check the immersion heater supply
Samsung lists an immersion heater that is switched off, or whose thermal cut-out has tripped, as a reason for cold tank water. Check its switch or breaker is on. Leave any reset inside the unit to your installer.
When to call your installer
If E919 keeps coming back, ask your installer to check the immersion (booster) heater, its thermal cut-out and the disinfection timing settings (Samsung's FSV 3041 to 3046).
Quick answers
What does the Samsung E919 error code mean?
The scheduled disinfection (anti-legionella) cycle did not get the hot water tank hot enough, or could not hold that temperature for long enough. Samsung's control kit manual: 'Error that the set temperature for disinfection operation is not reached, or, after reaching, the temperature fails to continue for the requested time'.
Can I fix Samsung E919 myself?
Easy (about 10 minutes). Start with: avoid hot taps during the cycle; don't stop the tank mid-cycle; check the immersion heater supply. If E919 keeps coming back, ask your installer to check the immersion (booster) heater, its thermal cut-out and the disinfection timing settings (Samsung's FSV 3041 to 3046).
Is Samsung E919 worth repairing?
Usually free. A one-off after heavy hot water use is not a fault. If it repeats, the immersion heater or settings need checking.
Checked against
- 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 Mono (R32) Installer Reference Guide (PDF), troubleshooting: heating and disinfection (ManualsLib copy)
- Samsung EHS Mono (R32) Installer Reference Guide (PDF), troubleshooting overview (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.