Stiebel Eltron DHF 13 C Utilisation Et Installation page 27

INSTALLATION
Troubleshooting
13. Troubleshooting
Fault
No hot water.
The appliance does not start.
The differential pressure switch (MRC control valve)
with flow meter does not activate, even though the
DHW valve is fully open.
The appliance is not supplying hot water; the differ-
ential pressure switch has activated audibly.
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.
WARNING Burns
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 If dismantled, store the appliance in a room free from the f
risk of frost, as water residues remaining inside the appli-
ance can freeze and cause damage.
Cleaning the strainer
A strainer is fitted in the 3-way ball shut-off valve. In case of con-
tamination, you can remove this strainer and clean it.
f Remove the plastic profile washer and the strainer and clean f
the components.
f Fit the strainer and the plastic profile washer. f
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Cause
The fuse/MCB in the fuse box has blown/responded. Check the fuse/MCB in your fuse box/distribution
The heating system is faulty.
The mains water pressure is too low.
The strainer in the cold water inlet is blocked.
The start-up volume required for the appliance to
start heating at the selected output has not been
reached (see chapter "Specification / Data table").
The high limit safety cut-out has switched the appli-
ance off for safety reasons. The appliance does not
heat up.
The MRC control valve has a contact fault.
The heating system is scaled up.
Remedy
panel.
Replace the tubular heater heating system.
Descale / clean the connected aerator / shower head.
Clean the strainer in the water inlet.
Clean the strainer in the water inlet.
Check the cold water inlet temperature and reduce it
if necessary.
Check the function of the MRC control valve and re-
place 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.
Replace the heating system.
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