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 10511Fault code Error text/description Emergencymode Possible cause Solution84 Coolant pressure outsidethe rangeError 29 has occurredthree times in a rowpossible See Error 29. See Error 29.Motor protection switch of thecompressor (Kriwan module) hasopened due to excessive windingtemperature.Kriwan module closes of its own accordafter 30 minutes.For VWS/VWW 22/2 and 30/2only:Circuit breaker of the tempera-ture monitor on the in-rush cur-rent limiter faulty.> Check bypass (ICL compressor) andwiring. If the green LED on the in-rushcurrent limiter does not light up, thetemperature monitor circuit breaker isfaulty.> Inform the factory customer servicedepartment.For VWS/VWW 38/2 and 46/2only:The fault relay on the in-rush cur-rent limiter has responded.The red LED on the in-rush cur-rent limiter is flashing:2x = Incorrect phase sequence3x = Compressor motor overcur-rent4x = Thyristor module excesstemperature5x = Low voltage/phase failure6x = Min./max. power frequency7x = No compressor connected> Check whether the green LED on thein-rush current limiter is lit. If thegreen LED is not lit, there is no powersupply or the in-rush current limiter isfaulty.> Check the power supply and restore.> Check the in-rush current limiter andinform the factory customer servicedepartment if necessary.> For VWS/VWW 38/2 and 46/2 only:If the green LED lights up and red LEDis flashing, find the cause in the list offlash codes above and rectify thefault, and inform the factory customerservice department if necessary.For VWS/VWW 38/2 and 46/2only: Phase failure in combinationwith fault 94.> See fault 94.90 Heating system pressuretoo lowPressure <50 kPa (0.5 bar).Heat pump shuts downand goes into operationautomatically when thepressure rises above70 kPa (0.7 bar)._ Pressure drop in the heating sys-tem due to leaks, air cushions ora faulty expansion vessel.> Check the heating system for leaks.> Top up water and bleed.> Check the expansion vessel.Screw couplings at the rear ofthe heat pump are not sealingcorrectly.> Retighten screw couplings.Compression screw connectionson the 3-way diverter valve areleaking.> Retighten the compression screw con-nections on the 3-way diverter valvefor heating/cylinder charging.91 Brine pressure too lowPressure < 20 kPa (0.2 bar)Heat pump shuts downand goes into operationautomatically when thepressure rises above40 kPa (0,4 bar).possible (VWS only) Pressure drop in thebrine circuit due to leaks or aircushions.> Check the brine circuit for leaks, topup brine and bleed.(VWS only) Brine pressure sensorfaulty.> 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.Circuit breaker F1 on printed cir-cuit board faulty.> Check circuit breaker F1 and replace ifnecessary.Brine pressure switch fitted on-site (VWS only) or limit thermo-stat has opened.> Check the brine pressure switch orlimit thermostat.11.4 Fault with permanent switch-off