Vaillant ecoMAX 635, Instructions For Installation And Servicing

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Troubleshooting 8
Instructions for installation and servicing ecoMAX
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8.1.3 Fault codes
Fault codes take priority over all other display functions
in the event of a system fault occurring (Table 8.3).
If multiple faults occur, the corresponding fault codes
are displayed alternately for about two seconds each.
8.1.4 Fault memory
The fault memory stores details of the ten most recent
faults.
• Press the ”i” and ”–” buttons simultaneously.
• Use the ”+” button to scroll back through the list of
memorised errors.
To cancel fault error memory display mode, proceed as
follows:
• Press the ”i” button below the display or
• Do not touch any key for about four minutes. The dis-
play will now revert back to showing the current flow
temperature.
8.2 Test programs
The use of different test programs permits the activati-
on of a range of special unit functions. Please refer to
Table 8.4 (below) for detailed information.
• Test programs P.1 to P.6 are activated by operating the
Power ON switch and pressing the ”+” button at the
same time (and keeping it pressed for five seconds).
”P.1” will now appear on the display
• Press the ”+” button to increase the test number
• Now press the ”i” button to start up the unit and
activate the test program
• Test programs can be aborted by pressing the ”i” and
”+” buttons at the same time. Test programs are also
cancelled if no button is operated for 15 minutes.
Display Meaning
P.1 Test program used when the unit runs at
full load after successful ignition
P.2 Test program used when the unit runs with
minimum gas consumption after successful
ignition
P.3 not applicable
P.4 not applicable
P.5 Program for STB (safety temperature
limiter) testing; the device heats up,
bypassing the regulator shutdown
procedure, until it reaches the STB
shutdown temperature of 97 °C
P.6 not applicable
Table 8.4 Test programs
80020014605_00GB_032006 22.02.2006 21:36 Uhr Seite 35