STIEBEL ELTRON DEL 18/21/24 SL electronic LCD Bedienung Und Installation Seite 36

InStaLLatIon
troubleshooting
13.2 indicator options for led diagnostic traffic light
Indicator options
Red Illuminates in the event of a fault
Yellow Illuminates during heating mode
Green Flashing: Appliance is supplied with mains power
13.3 Fault table
LED diagnostic fault
traffic light
No display No hot water.
Flashing green The appliance does not start.
light
No hot water at flow rate
> 3 l/min.
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.
36 | DEL SL electronic LCD
Cause
The fuse/MCB in the fuse box has blown/responded. Check the fuses/MCBs in your fuse box.
The safety pressure limiter has responded.
The PCB is faulty.
Inadequate flow rate.
Inadequate flow rate.
The flow sensor (DFE) plug has not been inserted.
The flow sensor (DFE) is faulty.
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).
remedy
Remove the cause of the fault (e.g. faulty pressure
washer).
Protect the heating system against overheating by
opening a draw-off valve downstream of the appli-
ance for one minute. This depressurises and cools
down the heating system.
Activate the safety pressure limiter at flow pressure
by pressing the reset button; see also chapter "Ini-
tial start-up".
Check the PCB, replace if required.
Descale / clean the connected aerator / shower
head.
Clean the strainer in the water inlet.
Plug the flow sensor plug back in.
Check the flow sensor and replace if required.
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.
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