Vaillant ecoTEC plus, Instructions For Installation And Servicing

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Troubleshooting
Instructions for installation and servicing ecoTEC 839592_13
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8
8.2 Test programs
Special functions can be triggered on the appliances by
activating various test programs.
These programs are given in detail in the Table 8.5.
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The test programs P.0 to P.6 will be started when
“Power ON” is turned on and the “+” key is pressed
for 5 s. The display shows “P.0”.
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Press the “+” key to start counting the test number
upwards.
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Press the “i” to operate the appliance now and to
start the test program.
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Press “i” and “+” simultaneously to exit the test pro-
grams. You can also exit the test programs by not
pressing any key for 15 minutes.
Display Meaning
P.0 Bleeding test program. The heating circuit and hot
water circuit (combination boiler only) is bled via the
automatic air vent (the cap on the automatic air vent
must be loosened).
P.1 Test program where the appliance is operated in full
load after successful ignition
P.2 Test program where the appliance is operated with
minimum gas volume (ignition gas volume) after suc-
cessful ignition
P.3 not available
P.4 not available
P.5 Test program for the safety temperature limit check;
appliance heats up by by-passing a regulating shut-
down through the flow regulator until the shutoff tem-
perature of 97 °C is achieved.
P.6 Filling test program. The diverter valve moves to the
centre position
Table 8.5 Test programs
8.3 Resetting parameter to factory settings
Besides the option to reset individual parameters
manually to the factory settings specified in Tables 8.2
and 8.3, you can also reset all parameters
simultaneously.
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In the second diagnostic level, under the diagnostic
number “
d.96 ” change the value to 1 (see section
8.1.2).
The parameters of all adjustable diagnostic numbers
now correspond to the factory settings.