Viessmann VITOPLEX 100?LS Installation And Service Instructions Manual page 19

Diagnostics
(cont.)
Fault/
system characteristics
The boiler produces wet
steam
Steam knocking inside
the boiler
Steam knocking inside
the condensate
container
The water level in the
boiler is too high
Cause
The boiler water
alkalinity is too high
The water level is set too
high
The feed water does not
enter via the feed water
connector
Check valve in the feed
water line is missing or
faulty
Faulty system
condensate drain
U bends buckle
The steam distributor
above the boiler is
insufficiently dewatered
Troubleshooting
Remedy
Regularly blow down
the boiler and install a
desalination system, if
required; treat water
according to EN 12953.
Dewater the
downstream steam line.
Check the boiler and feed
water daily. Check the
electrode length.
Connect the feed water
line to the correct
connector
Install or clean the check
valve (observe the flow
direction)
Identify and repair the
faulty drain
Reduce the steam
pressure
Install a condensate
drain
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