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Vaillant ecoVIT exclusiv VKK 476-4 Manual

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Appendix
0020258609_00 ecoVIT exclusiv Operating instructions 15
Symptom Possible cause Measure
No hot water, heating stays cold Fault during the ignition pro-
cess. F.28 "No ignition during
start-up" or F.29 "Flame goes
out during operation" appears
in the display. The symbol is
shown in the display.
1. Check whether the gas stopcock is open.
2. If the gas stopcock is closed, open the gas stopcock with the
agreement of an installation company.
3. Press and hold the reset button for one second to cancel
ignition switch-off after three unsuccessful attempts if the
burner has so far failed to ignite.
4. If the product does not start up after three reset attempts,
contact an approved heating specialist company.
Fault in the air/flue gas route
or condensate discharge. F.32
"Speed deviation too great" or
F.50 "Failure Siphon switch"
appears in the display. The
and symbols are shown in the
display.
1. Contact an approved heating specialist company.
Domestic hot water functioning
correctly; heating does not start
up
Control settings not correct 1. Compare the control settings with the specifications in the
control's operating instructions.
2. Correct the settings in accordance with the operating instruc-
tions for the control.
3. Contact an approved heating specialist company if you en-
counter problems when configuring the settings.
The rotary knob for the heating
flow temperature is not at the
clockwise end stop when the
control is connected
1. Check the setting of the rotary knob for the heating flow tem-
perature when the control is connected.
2. Turn the rotary knob for the heating flow temperature as far
as it will go clockwise.
Heating flow temperature set
incorrectly with no control con-
nected
1. Check the heating flow temperature setting.
2. Set the rotary knob for the heating flow temperature to the
required heating flow temperature with no control connected.
No hot water, heating function-
ing correctly
Control settings not correct 1. Compare the control settings with the specifications in the
control's operating instructions; the rotary knob for the cylin-
der temperature is at the clockwise end stop when the con-
trol is connected.
2. Correct the settings in accordance with the operating instruc-
tions for the control.
3. Contact an approved heating specialist company if you en-
counter problems when configuring the settings.
The rotary knob for the cylinder
temperature is not at the clock-
wise end stop when the control
is connected
1. Check the setting for the rotary knob for the cylinder temper-
ature when the control is connected.
2. Set the rotary knob for the cylinder temperature as far as it
will go clockwise when the control is connected.
The cylinder temperature is
set incorrectly with no control
connected
1. Check the cylinder temperature setting.
2. Set the rotary knob for the cylinder temperature to the re-
quired cylinder temperature with no control connected.
… 15


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