Diagnosis Codes; Status Codes; Diagnosis Level 1; A Caution - Vaillant ecoTEC VU 466/4 Installation And Maintenance Instructions Manual

Display Meaning
Heating mode
S.0 Heating 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-period xx min
Domestic hot water mode (DHW)
S.20 DHW demand
S.21 DHW mode fan start-up
S.22 DHW mode pump pre-run
S.23 DHW mode ignition
S.24 DHW mode burner on
S.25 DHW mode pump/fan overrun
S.26 DHW mode fan overrun
S.27 DHW mode pump overrun
S.28 DHW mode 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
variation is too high. Boiler 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 flap return signal blocks burner operation (only
in connection with accessories) or condensate pump
faulty, heat demand is blocked
S.53 Boiler remains within the waiting time for the modula-
tion block/operation block function due to a water lack
(flow-return difference too large)
S.54 Boiler remains within the waiting time of the operation
block function due to a water lack (temperature
gradient)
S.59 Waiting time: minimum quantity of circulation water not
achieved
S.85 Service info: Check quantity of circulation water
S.96 Return temperature sensor test running, heating
demands are blocked
S.97 Water pressure sensor test running, heating demands
are blocked
S.98 Flow/return temperature sensor test is in progress,
heating demands are blocked
SEr Carry out a service in the near future. Press the
„i"-button for further information.
Table 9.1 Status codes
Installation and maintenance instructions ecoTEC 0020029172_03
9.1.2

Diagnosis codes

In the diagnosis mode, you can change certain
parameters or display more information.
The diagnosis information is divided into two diagnosis
nd
levels. The 2 diagnosis level can be reached only after
entering a password.
a Caution!
The access to the 2
be used by a qualified heating engineer.
st
1 diagnosis level
• Push the "i" and "+" buttons simultaneously.
The display shows "d.0".
• Scroll to the desired diagnosis code on the 1
diagnosis level with the "+" or "–" buttons (see
Table 9.2).
• Push the "i" button
The display shows the associated diagnosis information.
• If necessary, use the "+" or "–" keys to change the
value (display flashes).
• Save the new value by holding the "i" button pressed
for about 5 seconds until the display stops flashing.
You can finish the diagnosis mode as follows:
• Push the "i" and "+" buttons simultaneously or
• Do not push any buttons for about 4 minutes.
The current heating flow temperature or the current
water pressure of the heating installation reappears in
the display.
Troubleshooting 9
nd
diagnosis level may only
st
43