Troubleshooting guideTroubleshooting guide
33
Diagnosis and correction (continued) Vitotronic 300-K, MW1S
Fault Cause Remedy
The rooms are cold during the day
but warm at night
Time incorrectly set Set correct time (page 20)
Control unit incorrectly programmed
or set
Check and, if necessary, correct the
settings for the temperatures (page
8), the time program (page 12) and
the heating program (page 7)
”Fault” flashes in the display win-
dow
Fault on heating system Make a note of the fault code and
inform your heating contractor (page
26)
”Without function” appears in the
display window of the control unit
The button pressed has no function,
e.g. uw if no DHW tank is
connected
Diagnosis and correction (continued) Vitotronic 300-K, MW1S
Servicing
Servicing of heating systems is
required under current heating system
regulations and standards.
Regular servicing of the heating system
will ensure troublefree, energy-saving
and environmentally friendly heating.
We strongly advise you to arrange a
service contract with your heating
contractor.
Operational checks
The following operational checks
should be carried out every month:
Regularly check the pressure of
the system.
Check correct operation of safety
valve.
Check correct operation of control
equipment.
Check all seals and re-seal if
necessary.
Check the ventilation facilities of the
boiler room (see safety note on page
2).
Check function of neutralizing unit.
Check level of neutralizing agent.
Boiler
All boilers have to be cleaned at certain
intervals as the flue gas temperature
and therefore the energy loss rise as
the level of contamination increases.
We recommend the use of a flue gas
thermometer.
The flue gas temperature can be
monitored with the flue gas tempera-
ture sensor which is available as an
accessory. A flue gas temperature
monitoring system will provide an
indication of incorrect burner
adjustment and the degree of
contamination of the boiler.
The efficiency of the system will be
impaired if the flue gas temperature is
excessively high due to contamination
of the boiler or incorrect adjustment of
the burner. In this case it may be
necessary to clean the boiler or
readjust the burner.
A built-in hours run meter measures
the operating times of the burner.
The longer the operating times, the
lower the standby losses.
Cleaning
The equipment can be cleaned with
domestic cleaning agents available
on the market (do not use abrasive
cleaning agents).
Note on disposal of unwanted
equipment
The unit contains an inbuilt, non-
toxic battery.
To safeguard the environment,
please dispose of spent batteries
properly via the appropriate
collection points.
The battery should be removed
by a competent person.
5581 751 v1.15581 751 v1.1
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