Vaillant ecoTEC VU 656/4 Installation And Maintenance Instructions Manual page 46

9 Troubleshooting
Display Meaning
d.0 Heating partial load
d.1 Pump overrun for heating mode
d.2 Maximum blocking time heating at 20°C flow tempera-
ture
d.4 Measured value of cylinder sensor
d.5 Target value of flow temperature (or target value of
return)
d.7 Set hot water temperature
d.8 Room thermostat at terminals 3-4
d.9 Set target flow temperature at terminal 7-8-9
d.10 Status of internal pump
d.11 Status external heating pump
d.12 Status of cylinder primary pump
d.13 Status of hot water circulation pump
d.15 Pump speed actual value
d.22 Hot water requirement via C1/C2, internal hot water
control system
d.23 Summer/winter operation (heating on/off)
d.24 not relevant
d.25 Hot water generation enabled by eBUS controller
d.29 Actual value, sensor circulation water quantity
d.30 Control signal for the gas valve
d.33 Fan speed target value
d.34 Fan speed actual value
d.35 not relevant
d.40 forward flow temperature
d.41 Return flow temperature
d.44 digitalised ionisation voltage
d.47 External temperature (with weather-controlled Vaillant
controller)
d.76 Boiler variant (display): Device specific number (DSN)
d.90 Digital regulator status
d.91 DCF status with external sensor connected
d.97 Activation of the 2
Table 9.2 Diagnosis codes in the 1
nd
2 diagnosis level
• Scroll as described above in the 1st diagnosis level to
diagnosis number d.97.
• Change the displayed value to 17 (password) and save
this value.
nd
You are now in the 2 diagnosis level in which all
st
information from the 1
(see Table 9.3) is displayed.
Scroll and change values and exit diagnosis mode as
st
described in the 1 diagnosis level.
46
nd
diagnosis level
st
diagnosis level
(see Table 9.2) and the 2
Display value/adjustable value
Adjustable heating partial load in kW (factory setting: approx. 70%
of maximum output)
2 - 60 minutes (factory setting: 5)
2 - 60 minutes (factory setting: 20)
in °C
in °C, maximum of the value set in d.71, limited by an eBUS controller
if connected)
40 to 65 °C (maximum temperature can be adjusted at d.20)
0 = Room thermostat open (no heat request)
1 = Room thermostat closed (heat request)
in °C, minimum off, target value of ext. eBus and target value of
terminal 7
1 = on, 0 = off
1 to 100 = on, 0 = off
1 to 100 = on, 0 = off
1 to 100 = on, 0 = off
Actual value internal pump in %
1 = on, 0 = off
1 = heating on (winter mode), 0 = heating off (summer mode)
not relevant
1 = yes, 0 = no
3
Actual value in m /h
1 = on, 0 = off
in rpm/10
in rpm/10
Not relevant
actual value in °C
actual value in °C
Display range 0 to 102, >80 no flame, <40 good flame display
Actual value in °C
47
1 = detected, 0 = not detected (eBUS Address <=10)
0 = no reception, 1 = reception, 2 = synchronised, 3 = valid
Code: 17 for level 2
h Note!
If you push the buttons "i" and "+" within
4 minutes of leaving the 2
you can directly access the 2
without re-entering the password.
nd
Installation and maintenance instructions ecoTEC 0020029173_01
nd
diagnosis level,
nd
diagnosis level