Installation and maintenance instructions ecoTEC 0020029173_01
44
9 Troubleshooting
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Note!
Whenever possible, please quote the fault code
displayed (F.xx) and the status of the boiler
(S.xx) when contacting the Vaillant customer
service or your Vaillant service partner.
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
"Burner operation, heating".
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.
Display
Meaning
Heating mode
S.0
Heating mode 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 remaining off-time xx min
Domestic hot water mode (DHW)
S.20
Hot water requirement
S.21
Fan start-up
S.22
Pump pre-run
S.23
Ignition
S.24
Burner on
S.25
Pump/fan overrun
S.26
Fan overrun
S.27
Mode pump overrun
S.28
Burner off-period
Other:
S.30
Heating mode blocked by room thermostat
(terminal 3-4 open)
S.31
Summer mode active or no heat demand from eBUS
controller
S.32
Heat exchanger antifreeze active, as fan speed varia-
tion is too high. Appliance is within the waiting time of
the operation block function
S.34
Antifrost mode active
S.36
Reference setting of continuous controller 7-8-9 or
e-BUS controller is < 20°C and blocks the heating mode
S.39
Contact thermostat activated
S.41
Water pressure > 2.8 bar
S.42
Exhaust gas diverter return signal blocks burner
operation (only in connection with accessories) or
condensate pump faulty, heat demand is blocked
S.53
Unit is observing the waiting time for the modulation
block/operation block function due to a water shortage
(flow-return difference too large)
S.54
Unit is observing the waiting period of the operation
block function due to a water shortage (temperature
gradient)
S.59
Waiting time: minimum quantity of circulation water not
achieved
S.85
Check quantity of circulation water
S.96
Return sensor test running, heating demands are
blocked
S.97
Water pressure sensor test running, heating demands
are blocked
S.98
Self-test flow/return NTC
Table 9.1 Status codes
9 Troubleshooting
