Appendix
0020149486_04 auroFLOW plus Installation and maintenance instructions
33
Fault
Possible cause
Explanation/remedy
Filling is completed, however fluid is not
flowing back from the collectors
Excessive loss of pressure in the solar cir-
cuit
Check the solar circuit for blockages/kinks,
check the collector field for blockages, in-
crease the filling time on the solar control
Solar pump is running, however cylinder
charging pump is not running
Temperature of the solar fluid is too low
No fault
Cylinder charging pump is not functioning
reliably
Check the plug/power cable/signal cable of
the cylinder charging pump
Solar filling is active
Checking the pump symbol in the display
–
flashes: Filling
–
permanently on: Cylinder charging
Solar yield unusually high
High heat losses
Insulate the system
The solar yield is always higher than the
primary energy that is saved
System or product are making noises
Gurgling noise is normal
No fault
Air in the solar pump
Purge the solar pump
Air in the cylinder charging pump.
Purge the cylinder charging pump, check
the pressure in the cylinder charging cir-
cuit, add water if necessary, and flush the
cylinder charging circuit
Displayed temperature is incorrect
Poor connection of the temperature sensor
Check the seating and position of the tem-
perature sensor
Discolouration of storage tank
Yellowing of the storage tank is normal,
very strong/rapid discolouration is an in-
dication of high temperatures in the solar
circuit
Check the solar circuit function
Check the cylinder charging circuit function
The solar fluid level falls over time
Solar circuit leaking
Find and seal any leaks
Pressure too high and expansion relief
valve discharges
Check the expansion relief valve function
Check that the solar collectors are able to
drain
Solar fluid remains in the collector field or
in the pipeline, and does not all flow back
to the storage tank
This is not a problem provided that the
system is returning a solar yield
Solar pump running, solar fluid is not being
pumped
Stop valve closed
Open the stop valve
Pressure losses too high
Check the solar circuit function
Check the cylinder charging circuit function
Some setting parameters cannot be
changed (time, date, operating mode, UV5
switching temperature, etc.)
Product was/is connected to
auroMATIC
VRS 620
Remove
auroMATIC VRS 620
and restart
the product (press reset button)
Hot water and/or heating circuit are
charged irregularly (e.g. heating mode in
the summer)
No
VPM W
drinking water station available
Permanently disconnect eBus, restart the
product. Install drinking water station
D
Technical data
VPM 15 D basic
module
VPM 30 D (ba-
sic module
with expansion
module)
Plate heat exchanger
output
16 kW
16 kW
Solar pump output
≤
65 W
≤
130 W
Cylinder charging
pump output
≤
65 W
≤
65 W
Storage tank volume
20 l
40 l
Product dimensions,
height
750 mm
750 mm
Product dimensions,
width
450 mm
900 mm
