Appendix; A Annual Inspection And Maintenance Work - Overview; B Fault Messages - Overview - Vaillant aroSTOR VWL BM 270/5 Installation And Maintenance Instructions Manual

Appendix

Appendix
Annual inspection and maintenance work – Overview
A
No. Work
Check that the safety devices are functioning properly.
1
Check the refrigerant circuit for leak-tightness.
2
Check the hydraulic circuit for leak-tightness.
3
Check that the safety group is working properly.
4
Check whether the components of the refrigerant circuit show any signs of rust or traces of oil.
5
Check the unit's components for wear.
6
7 Check whether the unit's components are defective.
Check that the cables are securely seated on the connection terminals.
8
9 Check the electrical installation in accordance with the applicable standards and regulations.
10 Check the product's earthing.
Check the heat pump's flow temperature and inspect the settings.
11
Check the compressor for ice formation.
12
Remove the dust from power supply connections.
13
Clean the evaporator carefully to avoid damaging the fins. Make sure that the air can circulate between the fins and
14
around the product.
Check that the fan runs freely.
15
16 Check whether the condensate drains off without any problems.
17 Check the scale deposition on the immersion heater. If the layer of limescale is thicker than 5 mm, you must replace the
immersion heater.
Record the inspection/maintenance work carried out.
18
Fault messages – Overview
B
Fault code Description
–
buS PCB defective
–
Bus connection to the
display is faulty
–
Display defective
T_AI R Air temperature sensor
defective (extracted air)
T_DE FROST Evaporator temperature
sensor defective
(Defrosting temperature)
T_WA TER Water temperature sensor
defective
CLOC K Time
24
Possible cause Solution
– –
Overvoltage in the
power grid
–
–
Cabling fault in the
power supply connec-
–
tion (low-tariff contact
or external ventilator
control system)
–
Damage during trans-
port
–
Sensor defective Replace the sensor
–
Sensor not connected
to the PCB
–
Sensor cable damaged
–
Sensor defective Replace the sensor
–
Sensor not connected
to the PCB
–
Sensor cable damaged
–
Sensor defective Replace the sensor
–
Sensor not connected
to the PCB
–
Sensor cable damaged
– –
Overvoltage in the
power grid
– –
Damage during trans-
port
Installation and maintenance instructions aroSTOR 0020290840_00
Temporary operation
Replacing the PCB Product decommissioned.
Replacing the display
PCB
Replacing the display
connection cable
Heat pump decommis-
sioned.
The selected back-up
heater keeps the water
temperature at 38 °C.
Heat pump decommis-
sioned.
The selected back-up
heater keeps the water
temperature at 38 °C.
Heat pump decommis-
sioned.
Replacing the display Operating times are no
PCB longer considered:
Replacing the display Target temperature for do-
connection cable mestic hot water is per-
manently maintained (no
signal on connection plug
numbers 1 and 2).