B Overview Of Diagnostics Codes - Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

# Maintenance work
28 Reassemble the product
29 Opening the service valves
30 Test that the product/heating installation and the domestic hot water gen-
eration (if required) are working correctly. If required, carry out purging
31 Checking and, if required, correcting the position of the frost protection
heating elements
32 Completing inspection and maintenance work
33 Visually check the ignition and burner behaviour
34 Checking the CO/CO₂ content following maintenance work
35 Check the product for gas, flue gas and water leaks
B Overview of diagnostics codes
Validity: VU 446/5-5 (H-GB) OR VU 606/5-5 (H-GB)
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Code Parameter
D.000 Partial heat load
D.001 Overrun time for the internal pump
after a heat demand
D.002 Max. burner anti-cycling time in heat-
ing mode at 20 °C flow temperature
D.003 Domestic hot water temperature
D.004 Measured value for the cylinder
temperature in °C
D.005 Target value for the heating flow
temperature (or target value for the
return) in °C
D.007 Target value for the domestic hot
water cylinder temperature in °C
D.009 Heating flow temperature, target
value from external eBUS controller
D.010 Status of the internal heating pump
D.011 Status of additional external heating
pump
D.012 Status of cylinder charging pump
D.013 Status of circulation pump
D.014 Setting for speed-controlled internal
heating pump
D.015 Current speed of the internal heating
pump in %
D.016 24 V DC room thermostat
open/closed
0020261389_03 ecoTEC plus Installation and maintenance instructions
Values or explanations
Adjustable partial heat load in kW
Auto: The product automatically adjusts the maximum
partial load to the current system demand.
2 to 60 min
2 to 60 min
Not connect.
If a domestic hot water cylinder with sensor is connec-
ted
The current target value, maximum value of the para-
meter that is set for D.071, limitation by an eBUS con-
trol, if connected
(15 °C = frost protection, 40 °C up to D.020 (max.
70 °C))
℃
0 = Off
1 = On
0 = Off
1-100 = On
0 = Off
1-100 = On
0 = Off
1-100 = On
0 = auto (pump modulates in accordance with the
control, with constant pressure)
From 1 to 5 = Fixed pump setting
–
1 = 53%
–
2 = 60%
–
3 = 70%
–
4 = 85%
–
5 = 100%
Heating mode off/on
Interval
After each time maintenance
work is carried out
Annually
Annually
Annually
Annually
Annually
Annually
Annually
Default
setting
Auto
5 min
20 min
0
47
User-spe-
cific setting
Not ad-
justable
Not ad-
justable
Not ad-
justable
Not ad-
justable
Not ad-
justable
Not ad-
justable
Not ad-
justable
Not ad-
justable
Not ad-
justable
55