Troubleshooting; Faults Due To Water Deficiency; Faults In Ignition - Vaillant ecoTEC SERIES Operating Manual

4 Operation
Display Meaning
Displays during heating operation
S. 0 Heating, no heat demand
S. 1 Heating mode, fan start-up
S. 2 Heating mode, pump flow
S. 3 Heating mode, ignition
S. 4 Heating mode, burner on
S. 6 Heating mode, fan overrun
S. 7 Heating mode, pump overrun
S. 8 Heating, remaining cut-off time xx min
S.31 no heat demand, summer operating mode
S.34 Heating mode, frost protection
Displays in storage tank charging
S. 20 Hot water requirement
S.22 Hot water handling, pump flow
S.24 Hot water operation burner on
Service message (appears as necessary and replaces
the normal status text)
S.85 Service message, quantity of circulation water
Table 4.1 Status codes and what they mean (selection)
4.7

Troubleshooting

If you have problems operating your gas-fired wall-
mounted boiler, you can check the following points
yourself:
No hot water, heating stays cold; Appliance does not
start:
– Are the gas isolator cocks for the building supply and
the appliance open (see Chapter 4.2.1)?
– Is the power supply switched on?
– Is the main switch on the gas-fired wall-mounted boil-
er switched on (see Chapter 4.3)?
– Is the rotary knob for setting the feed temperature on
the gas-fired wall-mounted boiler not turned to the far
left, i.e. frost protection active (see Chapter 4.4)?
– Is the filling pressure of the heating installation suffi-
cient (see Chapter 4.2.2)?
– Is there air in the heating installation?
– Is there a fault in the ignition process (see Chap-
ter 4.7.2)?
Hot water operation, no problem; Heating does not
start:
– Has the external controller (e.g. calorMATIC
controller) signalled a heat requirement (see Chap-
ter 4.5.4)?
14
Caution!
a
Inappropriate alterations can cause damage!
If your gas-fired wall-mounted boiler is still not
working properly after you have checked the
above points, consult a recognised expert tech-
nician company or Vaillant Service Solutions
for advice.
4.7.1

Faults due to water deficiency

The device switches to "Fault" if the filling pressure in
the heating system is too low. This malfunction is indi-
cated by the fault codes "F.22" (dry fire) or "F.23" or
"F.24" (water shortage). You can only start up the ap-
pliance again when the heating system is sufficiently
filled with water.
If the pressure drops frequently the reason for the loss
of hot water must be identified and eliminated by a rec-
ognised expert technician company.

4.7.2 Faults in ignition

1
2
Fig. 4.13 Troubleshooting
If the burner fails to ignite after five attempts, the unit
will not operate and switches to "Fault". This is indicat-
ed by the error code "F.28" or "F.29" on the display.
In addition, the display shows a flame symbol with a
cross through it (1).
Automatic ignition can only take place after you manu-
ally reset the fault.
• In this case, press the fault suppression button (2)
and hold it down for roughly one second to reset the
fault.
Operating manual ecoTEC 0020052777_00