Checking Gas Connection Pressure (Gas Inlet Working Pressure); Test Operation; Checking The Co Concentration; Troubleshooting 9 - Vaillant ecotec plus Installation And Maintenance Instructions Manual

• Fill the expansion vessel with air at a pressure of less
than 0.75 bar according to the static head of the
heating installation.
• If water is discharged at the testing nozzle of the
expansion vessel the vessel must be replaced.
8.8 Checking gas connection pressure
(gas inlet working pressure)
To check the connection pressure proceed as described
in Chapter 6.3.3.
8.9 Checking the CO
To check the CO concentration follow the procedure de-
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scribed in Chapter 8.1.3.
8.10

Test operation

Always perform the following checks after completing
any maintenance task:
• Start up the appliance in accordance with the
instructions in the relevant operating manual.
Fig. 8.11 Tightness check
• Check the appliance for gas and water leaks.
• Check the flue system for leaks and for proper
fixation.
• Check over-ignition and that the flame on the burner
is burning evenly.
• Check the function of the heating (see Chapter 6.4.1)
and hot water generation (see Chapter 6.4.2).
• Document the inspection/maintenance tasks carried
out in the form provided in the inspection or
maintenance contract.
Installation and maintenance instructions ecoTEC plus 0020214490_00
concentration
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Inspection and maintenance 8
9 Troubleshooting
h Note!
Whenever possible, please quote the fault
message displayed (F.xx) and the status of the
boiler (S.xx) when contacting the Vaillant
customer service or your Vaillant service
partner.
If the display flashes „SEr" this means, that
you should carry out a service in the near
future. The boiler is not in a failure mode but
works further on. Press the info-button „i" for
addional information.
9.1

Diagnostics

9.1.1

Status codes

The status codes that you can see on the display
provides information about the current operating
condition of the boiler.
The display of the status codes can be viewed as follows:
Fig. 9.1 Display of status codes
• Push the "i" button.
The status code appears in the display, e.g. S.4 for
"Heating mode, burner on.".
The display of the status codes can be ended as follows:
• Push the "i" button
or
• Do not push any buttons for about 4 minutes.
Depending on the settings, the current flow
temperature or current water pressure of the heating
installation reappears in the display.

Troubleshooting 9

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