Vaillant geoTHERM Installation Instructions Manual

Also see for geoTHERM SERIES: System Installation Instructions Installation and servicing Instructions for use Operating instructions

Contents

Fault diagnosis and rectificationInstallation instructions geoTHERM 0020051574_04 10311Fault code Error text/description Emergencymode Possible cause Solution32 Error heat source sen-sor T8Short circuit/disconnec-tion in the sensorpossible The internal temperature sensorfor the brine outlet temperatureis faulty or not plugged in cor-rectly on the circuit board.> Check the quality of plug contact onthe circuit board and on the cable har-ness.> Check sensors for correct operation(resistance measurement based on VR11 characteristics, ¬ Tab. 17.2).> Replace the sensors.33 Error heat circuit pressuresensorShort circuit/disconnec-tion in the pressure sensor_ The pressure sensor in the heat-ing circuit is faulty or not prop-erly plugged in.> Check the quality of plug contact onthe circuit board and on the cable har-ness.> Check the pressure sensor for correctoperation.> Replace the pressure sensor.34 Error brine pressure sen-sor(VWS only)Short circuit/disconnec-tion in the pressure sensorpossible The pressure sensor in the brinecircuit is faulty or not properlyplugged in.40 Error comp outlet sensorT1Short circuit/disconnec-tion in the sensorpossible The internal temperature sensoron the high pressure side of thecompressor is faulty or not prop-erly plugged into the PCB.> Check the quality of plug contact onthe circuit board and on the cable har-ness.> Check sensors for correct operation(resistance measurement based on VR11 characteristics, ¬ Tab. 17.2).> Replace the sensors.41 Error heat source sen-sor T3Short circuit/disconnec-tion in the sensorpossible The internal temperature sensorfor the brine inlet temperature isfaulty or not plugged in correctlyon the circuit board.42 Error HP return sensor T5Short circuit/disconnec-tion in the sensorpossible The internal temperature sensoron the heating return line isfaulty or not properly pluggedinto the PCB.43 Error HP flow sensor T6Short circuit/disconnec-tion in the sensorpossible The internal temperature sensoron the heating flow line is faultyor not properly plugged into thePCB.44 Error outdoor sensor AFShort circuit/disconnec-tion in the sensorpossible The outside temperature sensoror its connecting cable is faultyor it is not connected correctly.> Check the Pro-E plug on the circuitboard, check the connection line.> Replace the sensors.45 Error DHW tank sensor SPShort circuit/disconnec-tion in the sensorpossible The temperature sensor in theDHW tank is faulty or it is notconnected correctly.> Check the Pro-E plug on the circuitboard.> Check sensors for correct operation(resistance measurement based on VR10 characteristics, ¬ Tab. 17.1).> Replace the sensors.46 Error HB flow sensor VF1Short circuit/disconnec-tion in the sensorpossible The flow temperature sensor ofthe buffer tank is faulty or theconnection is incorrect.47 Error HB return sensorRF1Short circuit/disconnec-tion in the sensorpossible The return temperature sensor ofthe buffer tank is faulty or theconnection is incorrect.48 Error flow sensor VF2Short circuit/disconnec-tion in the sensorHot watermode possi-bleThe clamp-on temperature sensorVF2 in the heating circuit is faultyor it is not connected correctly.11.4 Fault with permanent switch-off