C Status Codes - Overview - Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual

No. Work
Check the gas flow pressure at maximum heat input. If the gas flow pressure is not within the
4
correct range, carry out maintenance work.
Check the CO₂ content (the air ratio) of the product and, if necessary, adjust it. Keep a record of
5
this.
Disconnect the product from the power mains. Check that the electrical plug connections and
6
other connections are seated correctly and correct these if necessary.
7 Close the gas isolator cock and the service valves.
Drain the product on the water side (observe the pressure gauge). Check the pre-charge pres-
8 sure of the expansion vessel, and top up the vessel if necessary (approx. 0.03 MPa/0.3 bar un-
der the system filling pressure).
9 Remove the compact thermal module.
10 Install the burner insulation on the back wall of the heat exchanger.
11 Clean the heat exchanger.
Replace the burner insulation (article number 0020093190) on the back wall of the heat ex-
12
changer. Replace the burner insulation each time maintenance work is carried out.
Check the burner insulation on the burner flange. If you notice any damage, replace the burner
13 insulation (article number 180913). Replace the burner flange seal (article number 180904) each
time it is opened and, accordingly, each time maintenance work is carried out.
14 Check the burner for damage and replace it if necessary.
15 Check the condensate trap in the product, and clean and fill this, if required.
16 Clean the condensate duct in the product.
17 Install the compact thermal module. Caution: Replace the seals (article number 130904).
18 Clean the air separation system.
19 Open the gas isolator cock, reconnect the product to the power mains and switch the product on.
Open the service valves, fill up the product/heating installation to 0.1-0.2 MPa/1.0-2.0 bar (de-
20
pending on the static height of the heating installation) and start the purging programme P.0.
Perform a test operation of the product and heating installation, including hot water generation,
21
and purge the system once more if necessary.
22 Check the product's gas ratio setting and, if required, reset it. Log the setting.
23 Visually inspect the ignition and burner behaviour.
24 Check the CO₂ content (the air ratio) of the product again.
Ensure that no gas, flue gas, hot water or condensate is leaking from the product. Restore leak-
25
tightness if necessary.
26 Record the inspection/maintenance work carried out.
Status codes – Overview
C
Status code Meaning
Heating mode
S.0 Heating: No heat demand
S.1 Heating mode: Fan start-up
S.2 Heating mode: Pump pre-run
S.3 Heating mode: Ignition
S.4 Heating mode: Burner on
S.5 Heating mode: Pump/fan overrun
S.6 Heating mode: Fan overrun
S.7 Heating mode: Pump overrun
S.8 Heating mode: Remaining anti-cycling time
Cylinder charging mode
S.20 DHW demand
0020029173_04 ecoTEC plus Installation and maintenance instructions
Appendix
Mainten-
ance
Inspection
(At least
(annual)
every
two years)
X X
X X
X X
X
X
X
X
X
X
X
X
X X
X
X
X
X X
X
X X
X
X X
X
X X
X X
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