Diagnosis Codes - Vaillant ecoTEC PLUS SERIES Installation And Maintenance Manual

Display Meaning
600 and 800 series (heating mode):
S.00 No heat required
S.01 Fan start
S.02 Water pump flow
S.03 Ignition
S.04 Burner mode
S.05 Fan and water pump return water
S.06 Fan return flow
S.07 Water pump return water
S.08 Burner lock after heating mode
only 800 series (drinking water mode):
S.10 Drinking 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
600 series (storage charging) and 800 series (warm start):
S.20 Storage cycle mode active
S.21 Fan start
S.22 Water pump flow
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
S.28 Burner lock after storage charging (cycle suppression)
600 and 800 series:
S.30 Room thermostat blocks heating operation
S.31 Summer mode active
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 Target value specification of analogue regulator
< 20 °C, i.e. the external regulator is blocking the heat-
ing operation
S.39 Feed thermostat addressed
S.42 Flue gas flap feedback is blocking burner mode (only in
connection with accessory)
S.53 Appliance is within the waiting period of the operation
block function due to water shortage (VL-RL spread too
big)
S.54 Appliance is within the waiting period of the operation
block function due to water shortage (temperature
gradient)
S.76 Appliance is within the waiting period of the operation
block function due to water shortage (water pressure
sensor)
Table 8.1 Status codes
Installation and maintenance manual ecoTEC

8.1.2 Diagnosis codes

In the diagnosis mode, you can change certain parame-
ters or display more information.
The diagnosis information is divided into two diagnosis
levels. The second diagnosis level can be reached only
after entering a password.
Caution!
Access to the second diagnosis level must be
used exclusively by a qualified technician.
First Diagnosis level
• Press the "i" and "+" keys simultaneously.
The display shows "d.00".
• Use the "+" or "–" keys to scroll through the desired
diagnosis numbers of the first diagnosis level (see
Table 8.2).
• Press the "i" key.
The display shows the relevant diagnosis information.
• If necessary, use the "+" or "–" keys to change the
value (display blinks).
• Save the new value by holding down the "i" key for
approx. 5 seconds until the display no longer blinks.
You can end the diagnosis mode as follows:
• Press the "i" and "+" keys simultaneously.
or
• Do not press any key for about 4 minutes.
The current heating flow temperature appears in the dis-
play again.
Second diagnosis level
• As described above in the first diagnosis level, scroll
through the diagnosis number d.97.
• Change the displayed value to 17 (password) and save
this value.
You are now in the second diagnosis level where all
information from the first diagnosis level (see Table 8.2)
and the second diagnosis level (see Table 8.3) is dis-
played.
Scrolling and changing values and exiting the diagnosis
mode is done as described in the first diagnosis level.
Note
After exiting the second diagnosis level, if you
press "i" and "+" within 4 minutes, you will
directly reach the second diagnosis level with-
out having to enter the password again.
Troubleshooting 8
45