Vaillant VWL 57/5 IS Operating, Installation And Maintenance Instructions

Also see for VWL 105/5 AS S2: Operating instructions Operating instructions Operating instructions

Contents

Appendix56 Installation and maintenance instructions Hydraulic station 0020257319_02Code Meaning Cause RemedyF.785 Fan unit 2: Fan blocked – There is no confirmation signal stat-ing that the fan is rotating– Check the air route and, if required,remove any blockagesF.788 Building circuit: Pump fault – The electronics system of the high-efficiency pump has detected afault (e.g. dry running, blockage,overvoltage, undervoltage) and hasswitched off and locked the pump.– Switch the heat pump off for at least30 seconds (no current)– Check the quality of the plug contacton the PCB– Check that the pump functions cor-rectly– Purging the building circuit– Check that the dirt filter that is inplace is permeableF.817 Freq. converter fault: Compressor – Defect in the compressor (e.g. shortcircuit)– Defect in the frequency converter– Connection cable to the compressoris defective or loose– Measure the winding resistance inthe compressor– Measure the frequency converteroutput between the three phases, (itmust be > 1 kΩ)– Check the cable harness and plugconnectionsF.818 Freq. converter fault: Mainsvoltage– Incorrect mains voltage for operatingthe frequency converter– Shutdown via the energy supplycompany– Measure and, if required, correct themains voltageThe mains voltage must be between195 V and 253 V.F.819 Freq. converter fault: Overheating – Internal overheating of the frequencyconverter– Allow the frequency converter to cooland restart the product– Check the frequency converter's airroute– Check that the fan is working cor-rectly– The maximum environmental tem-perature of the outdoor unit (46 °C)has been exceeded.F.820 Connection fault: Building circuitpump– Pump does not report any signalback to the heat pump– Check the cable to the pump fordefects and, if required, replace it– Replace the pumpF.821 Sensor fault: Immers. heater flowtemp.– The sensor is not connected or thesensor input has short-circuited– Both of the flow temperature sensorsin the heat pump are defective– Check and, if required, replace thesensor– Replace the cable harnessF.823 Hot gas temperature switch open – The hot gas thermostat shuts downthe heat pump if the temperaturein the refrigerant circuit is too high.Following a waiting period, the heatpump attempts to start once more.After three failed start attemptsin succession, a fault message isdisplayed.– Max. refrigerant circuit temperature:130 °C– Waiting period: 5 mins (after it firstoccurs)– Waiting period: 30 mins (after itoccurs a second time and any othertime after that)– The fault counter is reset if both ofthe following conditions are met:– Heat requirement without switch-ing off prematurely– 60 mins uninterrupted operation– Check the EEV– Replace the dirt filter in the refrigera-tion circuit, if requiredF.825 Sensor fault: Capac. inlet temp. – Refrigerant circuit temperaturesensor (vapour-forming) not con-nected or the sensor input has short-circuited– Check and, if required, replace thesensor and cable