Appendix; A Annual Inspection And Maintenance Work - Overview; B Fault Messages - Overview - Vaillant aroSTOR VWL B 200/5 UK Installation And Maintenance Instructions Manual

Appendix

Annual inspection and maintenance work – Overview
A
No. Work
1 Check the connections for tightness.
2 Check the temperature and pressure expansion relief valve.
3 Check the expansion relief valve.
4 Check the pressure in the expansion vessel.
5 Check the domestic hot water output at the valve (if required, clean the filters).
Check that the safety devices are functioning properly.
6
Check the refrigerant circuit for leak-tightness.
7
Check the hydraulic circuit for leak-tightness.
8
Check that the safety assembly is working properly.
9
10 Check whether the components of the refrigerant circuit show any signs of rust or traces of oil.
Check the unit's components for wear.
11
Check whether the unit's components are defective.
12
Check that the cables are securely seated on the connection terminals.
13
14 Check the electrical installation in accordance with the applicable standards and regulations.
Check the product's earthing.
15
Check the evaporator for ice formation.
16
Remove the dust from power supply connections.
17
Clean the evaporator carefully to avoid damaging the fins. Ensure that air circulation through the entire circuit, including
18
the air intake, is not impeded.
Check that the fan runs freely and is clean.
19
20 Check whether the condensate drains off without any problems.
21 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.
22
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
24
Possible cause
–
Overvoltage in the
power grid
–
Cabling fault in the
power supply connec-
tion (low-tariff contact
or external fan control
system)
–
Damage during trans-
port
–
Sensor defective
–
Sensor not connected
to the PCB
–
Sensor cable damaged
–
Sensor defective
–
Sensor not connected
to the PCB
–
Sensor cable damaged
–
Sensor defective
–
Sensor not connected
to the PCB
–
Sensor cable damaged
Solution
–
Replacing the PCB
–
Replacing the display
PCB
–
Replacing the display
connection cable
Replace the sensor
Replace the sensor
Replace the sensor
Installation and maintenance instructions 0020285063_05
Temporary operation
Product decommissioned.
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.