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12 Instructions for use ecoTEC
The boiler will now operate automatically to provide cen-
tral heating for the conditions selected on the external
controls (ecoTEC combination boilers will also provide
domestic hot water on demand).
After the boiler stops operating the pump will continue
to operate for a short period to fully disperse the heat
from the boiler.
Note
The boiler incorporates an anti-cycling econo-
miser control to prevent energy wasteful ON
and OFF operation of the boiler for short peri-
ods when in the central heating mode. When
turning the room thermostat to a higher setting
there may therefore be a short delay before the
boiler operates.
4.7 Status displays
bar
iFP
plus pro
2
1
Fig. 4.16 Status displays
The status displays provide information on the operating
status of the appliance.
• Press the i” button (1) to activate the status displays.
The display (2) then shows the current status code, for
example “S. 4” for burner operation. The table below
explains the most important status codes.
In switching phases, for example on starting up again
after the flame was extinguished, the status message
S.” briefly appears.
• Press the i” button (1) again to switch the display
back to normal mode.
Display Meaning
Displays during heating operation
S. 0 No heat required
S. 1 Pump running
S. 3 Ignition sequence (heating operation)
S. 4 Burner ignited
S. 6 Fan and pump overrun
S. 7 Pump overrun
S. 8 Anti cycling mode (after heating operation)
S.30 Room thermostat 3/4 no heating demand
S.31 Summer mode active
S.34 Frost protection mode
Displays in hot water operation (ecoTEC combinati-
on boilers only)
S.10 Hot water demand
S.14 Burner ignited
Displays for hot holding operation
(ecoTEC combination boilers only)
S.20 Hot holding request
S.24 Hot burner holding operation on
Displays in cylinder charging mode
(ecoTEC system boilers only)
S.20 Cylinder charging request
S.24 Cylinder charging burner on
Table 4.1 Status codes (selection, a complete set of status
codes can be found in the installation and servicing
manual)
4.8 Troubleshooting
In the unlikely event that a problem occurs with the ope-
ration of the ecoTEC boiler, the following points should
be checked:
Boiler fails to operate:
Is the gas supply turned on (see 4.3.1)?
Is the water supply turned on (ecoTEC combination
boilers only, see 4.3.1)?
Is there enough water in the heating system (see
4.3.2)?
Is the electrical supply switched ON?
Is the main ON/OFF control in the “ON” position
(switch position “I”, see 4.4)?
Is there an ignition problem (see 4.8.2)?
Hot water operates but no central heating (ecoTEC
combination boilers only)
- Is the heating turned ON (see 4.6.1)?
- Are all external heating controls ON (see 4.6.3)?
Caution
Inappropriate modifications can cause damage.
If your boiler still does not operate then please
consult your installer or Vaillant Service
Solutions (0870 6060 777).
4 Operation
12


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