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

24 Installation and maintenance instructions 0020285063_05AppendixA Annual inspection and maintenance work – OverviewNo. Work1 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).6 Check that the safety devices are functioning properly.7 Check the refrigerant circuit for leak-tightness.8 Check the hydraulic circuit for leak-tightness.9 Check that the safety assembly is working properly.10 Check whether the components of the refrigerant circuit show any signs of rust or traces of oil.11 Check the unit's components for wear.12 Check whether the unit's components are defective.13 Check that the cables are securely seated on the connection terminals.14 Check the electrical installation in accordance with the applicable standards and regulations.15 Check the product's earthing.16 Check the evaporator for ice formation.17 Remove the dust from power supply connections.18 Clean the evaporator carefully to avoid damaging the fins. Ensure that air circulation through the entire circuit, includingthe air intake, is not impeded.19 Check that the fan runs freely and is clean.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 theimmersion heater.22 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 fan controlsystem)– 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.