Operating instructions

Troubleshooting guide
35
Diagnosis and correction (continued) Vitocontrol-S, VD2/CT3/CM2
Fault Cause Remedy
The rooms are cold during the day
but warm at night
Time incorrectly set Set correct time
Control unit incorrectly programmed
or set
Check and, if necessary, correct the
settings for the temperatures , the
time program and the heating pro-
gram
”Fault” flashes in the display win-
dow
Fault on heating system Make a note of the fault code and
inform your heating contractor
”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
Servicing
Servicing of heating systems is re-
quired 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 con-
tractor.
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 neces-
sary.
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 moni-
tored with the flue gas temperature
sensor which is available as an acces-
sory. A flue gas temperature monitor-
ing system will provide an indication of
incorrect burner adjustment and the de-
gree of contamination of the boiler.
The efficiency of the system will be im-
paired if the flue gas temperature is ex-
cessively 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 read-
just 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 equip-
ment
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.
5351 341 v1.2