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9 Troubleshooting
9
Troubleshooting
Note!
h
If you wish to contact the Vaillant Service Team,
please refer to the error code displayed (F.xx)
and the appliance status (S.xx) if possible.
9.1
Diagnostics
9.1.1
Status codes
The status codes that you can see on the display pro-
vides information about the current operating condition
of the appliance.
Fig. 9.1 Display of status codes
The display of the status codes can be viewed as follows:
• Press the "i" button.
The display shows the status code, e.g. S.4 for
"Burner mode - Heating".
The display of the status codes can be ended as follows:
• Press the "i" button or
• Do not press any button for about 4 minutes.
The current filling pressure in the heating system
appears in the display again.
36
Display
Meaning
Heating mode
S.0
No heat required
S.1
Fan start
S.2
Water pump flow
S.3
Ignition
S.4
Burner mode
S.5
Fan and water pump return water
S.6
Fan return flow
S.7
Water pump return water
S.8
Burner lock after heating mode
Hot water function
S.10
Hot water switch on
S.11
Fan start
S.13
Ignition
S.14
Burner mode
S.15
Fan and water pump return water
S.16
Fan return flow
S.17
Water pump return water
Storage tank charging/heat retention mode
Page 20 Water pump flow
S.21
Fan start
S.23
Ignition
S.24
Burner mode
S.25
Fan and water pump return water
S.26
Fan return flow
S.27
Water pump return water
Burner lock after recharging/heat retention
S.28
(cycle suppression)
Other:
Room thermostat blocks heating operation
S.30
(terminal 3'-4' open)
Summer mode active or eBUS controller or timer
S.31
blocks heating operation
Heat exchanger antifreeze active, as fan speed
S.32
variation is too high. Appliance is within the waiting
time of the operation block function
S.34
Antifrost mode active
Target value specification of room thermostat
S.36
< 20 °C , i.e. the external regulator is blocking
the heating operation
S.41
Water pressure >2.9bar
Exhaust gas diverter return signal blocks burner
S.42
operation (only in connection with accessories) or
condensate pump faulty, heat demand is blocked
Appliance is within the waiting period of the
S.53
modulation block/operation block function due to
water shortage (flow-return spread too large)
Appliance is within the waiting period of the
S.54
operation block function due to water shortage
(temperature gradient)
Return sensor test running, heating demands
S.96
are blocked
Water pressure sensor test running, heating
S.97
demands are blocked
Flow/return sensor test running, heating
S.98
demands are blocked
Table 9.1 Status codes
ecoTEC exclusive installation and maintenance instructions / 0020017768_02
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