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Vaillant ecoTEC pure VCW 206-7-2 Manual

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Appendix
18 Operating instructions ecoTEC pure 0020258017_00
Status code Meaning
S.46 Protection mode: Minimum load
C Troubleshooting and fault elimination
C.1 Troubleshooting
Symptom Possible cause Measure
The system pres-
sure is flashing on the
display
The system pressure
is too low: < 0.05 MPa
(< 0.50 bar). Low wa-
ter pressure in the
heating installation.
▶ Fill the heating installation. (→ Page 13)
The system pressure
is too high: > 0.3 MPa
(> 3 bar).
▶ Wait until the excess heating water has
flowed out through the expansion relief
valve.
Product does not start
up (no hot water,
heating remains cold)
The gas isolator cock
installed on-site and/or
the gas isolator cock
on the product is
closed.
▶ Open both gas isolator cocks.
The cold water stop
valve is closed.
▶ Open the cold water stop valve.
The product is
switched off.
▶ Switch on the product. (→ Page 10)
The heating flow tem-
perature/hot water
temperature has been
set too low and/or the
heating mode/hot wa-
ter generation has
been switched off.
1. Set the heating flow temperature.
2. Set the hot water temperature.
There is air in the
heating installation.
▶ Have a competent person purge the heating
installation.
Hot water generation
functioning correctly;
heating does not start
up
The external controller
is not set correctly.
▶ Set the external controller correctly (→Con-
troller operating instructions).
C.2 Rectifying faults
Message Possible cause Measure
F.28 Ignition unsuc-
cessful
After three unsuc-
cessful ignition at-
tempts, the product
has switched to fault
mode.
1. Check whether the gas isolator cock is
open.
2. Press the reset button for longer than
three seconds.
3. If you have been unable to eliminate the
ignition fault after the fault clearance at-
tempt, consult a competent person.
… 18


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