Operating instructions

13Instructions for use ecoTEC / 838402-05
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 combina-
tion 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)
h
Note
The ecoTEC exclusive display has also cleartext
for a direct information
4.8 Troubleshooting
In the unlikely event that a problem occurs with the op-
eration 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)?
a
Caution
Inappropriate modifications can cause damage.
If your boiler still does not operate then please
consult your installer or Vaillant Service Solu-
tions (0870 6060 777).
4.8.1 Problems due to low system water pressure
The device switches to “Fault” if the water pressure in
the heating system is too low. This malfunction is indi-
cated by the fault code “F.22” (dry fire) or “F.23” or
“F.24” (lack of water).
You can only start up the appliance again when the
heating system is sufficiently filled with water.
4.8.2 Ignition problems
3
plus/exclusive pro
Fig. 4.17 Troubleshooting
If the burner fails to ignite after five attempts, the de-
vice does not start up and switches to “Fault”. This is in-
dicated by the fault code “F.28” or “F.29” in the display.
On ecoTEC plus appliances the display also shows the
flame symbol with a cross through it (1). On ecoTEC pro
appliances, the red LED (2) also lights up.
Automatic ignition can only take place after you manu-
ally reset the fault.
• To reset the fault, press the reset button (3) and hold
it down for one second.
a
Caution
If the boiler still shuts off after three attempts
of resetting, please consult your installer or
Vaillant Service Solutions.
4.8.3 Flue problems
The appliances are fitted with a fan. If the fan does not
work properly, the appliance will switch itself off.
The display shows the symbols
and and the fault
message “F.32”.
Operation 4