Maintenance; Specification; Dimensions And Connections - STIEBEL ELTRON DEL 21 SL electronic LCD Operation And Installation

INSTALLATION

Maintenance

LED diagnostic Fault
traffic light
Flashing green No hot water at flow rate of
light and steady > 3 l/min.
yellow light
The set temperature is not
achieved.
The outlet temperature is approx.
45 °C, irrespective of the set value
transducer
A set temperature of > 43 °C is not
achieved.
Flashing green No hot water.
light and steady
red light
Selected temperatures above 45 °C
are not achieved.
14. Maintenance
WARNING Electrocution
Before any work on the appliance, disconnect all poles
from the power supply.
Draining the appliance
You can drain the appliance for maintenance work or to protect
it from frost.
CAUTION Scalding
Hot water may escape when draining the appliance.
f Close the shut-off valve in the cold water inlet line. f
f Open all draw-off valves. f
f Undo the water connections on the appliance. f
f Store the dismantled appliance in a room free from the risk f
of frost, as water residues remaining inside the appliance can
freeze and cause damage.
36 | DEL SL electronic LCD
Cause
The high limit safety cut-out has responded or its
lead is broken.
One phase down.
The heater is faulty.
The outlet temperature sensor is faulty.
The appliance is at its output limit.
The set value transducer or connecting cable is faulty,
or the connecting cable is not attached.
The temperature limit (child-proofing) / anti-scalding
protection is enabled.
The outlet temperature sensor is faulty.
The cold water sensor is faulty.
The air sensor detects the presence of air in the water
and briefly interrupts the heating output.
The flow rate is > 25 l/min.
The cold water inlet temperature is above 45 °C (e.g.
in the case of water preheated by solar energy).

15. Specification

15.1 Dimensions and connections

Remedy
Check the appliance and the high limit safety cut-
out.
Check the fuses/MCBs in your fuse box.
Measure the resistance of the heating system and
replace if required.
Check the outlet temperature sensor and replace if
required.
Reduce the flow rate or install the flow limiter.
Attach the connecting cable; replace the set value
transducer if required.
Disable the temperature limit (child-proofing) / an-
ti-scalding protection.
Check the outlet temperature sensor and replace if
required.
Check the PCB, replace if required.
The appliance restarts after one minute.
Reduce the flow rate or install the flow limiter.
Reduce the cold water inlet temperature to the ap-
pliance.
225 ≤ 20
140
b02
30
100
c06 c01
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