STIEBEL ELTRON DHE 21 User Manual

www.stiebel-eltron.com DHE | 95
INSTALLATION
Troubleshooting
ENGLISH
Diagnostic traffic
lights (draw-off
mode)
Fault Cause Remedy
No LED illuminates Appliance does not heat up
One or more power supply phases are missing Check the fuses in the distribution board
PCB faulty Replace the function module
Green flashing, yellow
off, red off
No DHW
Appliance starting flow rate not reached; shower
head/aerator scaled up
Descale/replace the shower head/aerator
Appliance starting flow rate not reached; strainer in
cold water inlet dirty
Clean strainer
Flow meter not plugged in Check plug-in connection; correct if necessary
Flow meter faulty or dirty Replace flow meter
PCB faulty Replace the function module
Green flashing, yellow
on, red off
No display
Loose connecting cable between PCB and program-
ming unit
Check plug-in connections; correct if necessary
Faulty connecting cable between PCB and program-
ming unit
Check connecting cable; replace if necessary
Programming unit faulty Replace programming unit
PCB faulty Replace the function module
Green flashing, yellow
on, red off
No DHW; outlet temperature
does not match set value
Tap faulty Replace tap
Outlet sensor faulty Replace outlet sensor
Heating system faulty Replace the function module
PCB faulty Replace the function module
Green flashes, yellow
flashes, red off
No DHW; outlet temperature
does not match set value
Motorised valve faulty Replace motorised valve
Green flashing, yellow
off, red on
No DHW
One or more power supply phases are missing Check the fuses in the distribution board
Air detection has responded Continue draw-off for >1 min

STIEBEL ELTRON DHE 21 Specifications

General

Type	Electronic instantaneous water heater
Rated output	21 kW
Protection class	IP25
Energy efficiency class	A
Temperature range	60 °C
Power supply voltage	400 V
Dimensions	105 mm