www.stiebel-eltron.com DHF C-AU| 11
INSTALLATION
Troubleshooting
13. Troubleshooting
Fault Cause Remedy
No hot water.
The fuse/MCB in the fuse box has blown/responded. Check the fuses/MCBs in your fuse box/distribution
panel.
The heating system is faulty. Replace the tubular heater heating system.
The appliance does not start.
The mains water pressure is too low. Descale/ clean the connected aerator/ shower head.
The strainer in the cold water inlet is blocked. Clean the strainer in the water inlet.
The differential pressure switch (MRC control valve)
with flow meter does not activate, even though the
DHW valve is fully open.
The start-up volume required to start heating output
has not been reached (see chapter "Specification/
Data table").
Clean the strainer in the water inlet.
The appliance does not supply hot water; the differ-
ential pressure switch has activated audibly.
The high limit safety cut-out has switched the appli-
ance off for safety reasons. The appliance does not
heat up.
Check the cold water inlet temperature and reduce it
if necessary.
The MRC control valve has a contact fault.
Check the function of the control valve and replace it
if necessary.
Flush the heating system and avoid overheating it
while doing so.
Activate the safety pressure limiter at flow pressure
by firmly pressing the reset button.
The heater is scaled up. Replace the heater.
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.
WARNING Burns
Hot water may escape when draining the appliance.
Close the shut-off valve in the cold water inlet line.
Open all draw-off valves.
Undo the water connections on the appliance.
Store the dismantled appliance in a room free from the risk
of frost, as water residues remaining inside the appliance can
freeze and cause damage.
Cleaning the strainer
A strainer is located in the tee from the cold water inlet pipe. In
case of contamination, you can remove this strainer and clean it.
D0000043188
Remove the plastic profile washer and the strainer and clean
the components.
Fit the strainer and the plastic profile washer.
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