Vaillant aroSTOR VWL B 200/5 UK Installation And Maintenance Instructions Manual

Also see for aroSTOR VWL B 200/5 UK: Operating instructions Installation and maintenance instructions

Appendix0020285063_00 aroSTOR Installation and maintenance instructions 23AppendixA Annual inspection and maintenance work – OverviewNo. Work1 Check that the safety devices are functioning properly.2 Check the refrigerant circuit for leak-tightness.3 Check the hydraulic circuit for leak-tightness.4 Check the temperature and pressure expansion relief valve.5 Check that the safety group is working properly.6 Check whether the components of the refrigerant circuit show any signs of rust or traces of oil.7 Check the unit's components for wear.8 Check whether the unit's components are defective.9 Check that the cables are securely seated on the connection terminals.10 Check the electrical installation in accordance with the applicable standards and regulations.11 Check the product's earthing.12 Check the heat pump's flow temperature and inspect the settings.13 Check the compressor for ice formation.14 Remove the dust from power supply connections.15 Clean the evaporator carefully to avoid damaging the fins. Make sure that the air can circulate between the fins andaround the product.16 Check that the fan runs freely.17 Check whether the condensate drains off without any problems.18 Check the scale deposition on the immersion heater. If the layer of limescale is thicker than 5 mm, you must replace theimmersion heater.19 Record the inspection/maintenance work carried out.B Fault messages – OverviewFault code Description Possible cause Solution Temporary operationbuS – PCB defective– Bus connection to thedisplay is faulty– Display defective– Overvoltage in thepower grid– Cabling fault in thepower supply connec-tion (low-tariff contactor external ventilatorcontrol system)– Damage during trans-port– Replacing the PCB– Replacing the displayPCB– Replacing the displayconnection cableProduct decommissioned.T_AI R Air temperature sensordefective (extracted air)– Sensor defective– Sensor not connectedto the PCB– Sensor cable damagedReplace the sensor Heat pump decommis-sioned.The selected back-upheater keeps the watertemperature at 38 °C.T_DE FROST Evaporator temperaturesensor defective(Defrosting temperature)– Sensor defective– Sensor not connectedto the PCB– Sensor cable damagedReplace the sensor Heat pump decommis-sioned.The selected back-upheater keeps the watertemperature at 38 °C.T_WA TER Water temperature sensordefective– Sensor defective– Sensor not connectedto the PCB– Sensor cable damagedReplace the sensor Heat pump decommis-sioned.CLOC K Time – Overvoltage in thepower grid– Damage during trans-port– Replacing the displayPCB– Replacing the displayconnection cableOperating times are nolonger considered:Target temperature for do-mestic hot water is per-manently maintained (nosignal on connection plugnumbers 1 and 2).