C Troubleshooting And Fault Elimination; Troubleshooting; Rectifying Faults - Vaillant ecoTEC pure Operating Instructions Manual

Appendix
Status code
S.46 Protection mode: Minimum load

C Troubleshooting and fault elimination

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